KR101669270B1 - Dosimeter for Measuring Radiation - Google Patents

Abstract

An embodiment of the present invention is a dosimetry apparatus for measuring a dose of radiation, comprising: an optical fiber including a core region and a cladding region formed on an optical fiber preform to satisfy a total reflection condition of light, a housing in which the optical fiber is housed, (Al), cobalt (Co), and cobalt (Co), which increase a light loss value by irradiation with radiation, are formed on the other end of the optical connector, and a mirror for reflecting light is formed on the other end of the optical connector. And metal particles of iron (Fe) can be doped. Therefore, the dosimeter of the embodiment exhibits a linear optical loss response according to irradiation of radiation, and has a higher optical loss sensitivity than conventional optical fibers, and thus can be used as an optical sensor for measuring radiation.

Description

Dosimeter for Measuring Radiation [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dosimeter for measuring radiation, and more particularly, to a dosimeter provided with an optical fiber having optical loss characteristics capable of performing radiation measurement.

The atomic nucleus is made up of protons and neutrons. When protons and neutrons are combined to form nuclei, stable nuclei are formed depending on the ratio of protons and neutrons, and unstable nuclei are formed. Unstable nuclei are transformed into stable nuclei by bringing out alpha particles consisting of two protons and two neutrons, electrons, gamma rays, X-rays and neutrons. Radiation is the alpha, electron, gamma ray, X-ray, and neutron emitted when a nucleus changes to another nucleus.

Radiation can be divided into non-ionizing radiation such as radio waves, microwaves, infrared rays, and visible light, and ionizing radiation such as charged particles, electrons, quantum, heavy particles (alpha, proton, fission product) and photons .

In particular, ionizing radiation can be divided into electromagnetic radiation such as X-rays and γ-rays, and particle radiation such as α, β, electron beams, positron beams, proton beams, heavy ion beams, medium ion beams, mesophases, fission fragments and neutron beams. Such radiation has a large energy and can greatly affect the human body. Therefore, it is very important to measure the degree of harmfulness of the human body by measuring the radiation intensity. Therefore, stable operation of the nuclear power plant that produces nuclear energy using radiation is required, and a system using a radiation sensor to detect the radiation leakage in the nuclear power plant in real time should be constructed.

The radiation sensor, which is mainly used now, is divided into a gaseous detector, a scintillator detector, and a semiconductor detector according to the measurement principle. It is designed according to the kind and intensity of the radiation to be measured according to the constituent material, shape and size. Typically, in the case of a remote radiation measuring device based on an electronic circuit, electron-hole pairs are generated in the oxide film inside the semiconductor element when exposed to radiation, resulting in distortion of the device and circuit characteristics itself, resulting in malfunction and failure of the equipment.

Recently, development of a technology for proposing a radiation sensor using an optical fiber capable of solving the problems of such a radiation measuring apparatus and stably operating in a nuclear facility has been attracting attention. In the case of a radiation sensor using an optical fiber, a radiation sensor using a scintillating plastic optical fiber and a fluorescent optical fiber has been developed. However, this is limited by the external environment and there is a limitation in interlocking with a conventional optical communication device and an instrument.

It is an object of the present invention to provide a dosimeter for measuring radiation having a linear optical loss characteristic in radiation measurement and equipped with an optical fiber having a low optical recovery characteristic after light loss.

An object of the present invention is to provide a radiation dosimeter which is free from the external environment and interlocked with existing optical communication devices and instruments.

An object of the present invention is to provide a radiation dosimeter having a quick response characteristic according to irradiation with radiation, capable of downsizing the equipment and minimizing the influence of radiation due to packaging.

An embodiment of the present invention is a dosimeter for measuring radiation dose for measuring a dose of radiation, comprising: an optical fiber composed of a core region and a cladding region formed on an optical fiber preform so as to satisfy a total reflection condition of light; A housing in which the optical fiber is embedded; And an optical connector formed at an end of the optical fiber for performing optical input and output, a mirror for reflecting light is formed at the other end of the optical connector, and an aluminum (Al), cobalt (Co), and iron (Fe) may be doped.

In the radiation measuring dosimeter of the embodiment, the optical loss value increases linearly with time while the optical fiber is irradiated with the radiation, and the optical loss value with time is kept constant when the irradiation of radiation is not performed.

At least one of the transition metal element materials including Ti, Cu, Pb, Ni, V, Ag, Au, Mn, Zn and Bi is selectively doped to the optical fiber.

The optical fiber is further doped with at least one rare earth element including Tb, Yb, Er, Tm, Nd, Gd and Eu and a compound including CdMnTe, CdSe, PbSe and PbTe.

In the radiation measuring dosimeter of the embodiment, the optical fiber may have a linear slope of the optical loss value according to the dose (Gy), and the slope of the optical loss value according to the dose (Gy) It is characterized by constant.

An embodiment of the present invention is a radiation dosimeter for measuring a dose of radiation, comprising: an optical fiber composed of a core region and a cladding region formed on an optical fiber base material so as to satisfy a total reflection condition of light; A jumper cord surrounding the optical fiber; And an optical connector formed on the end of the optical fiber and performing input / output of light, wherein the core region is formed of a metal particle of aluminum (Al), cobalt (Co), and iron (Fe) Is doped.

In addition, the longitudinal section of the optical connector may be formed at a predetermined angle to reduce reflection loss of light, and the optical loss value with time increases linearly while the optical fiber is irradiated with the radiation, The optical loss value with time can be kept constant.

At least one of the transition metal element materials including Ti, Cu, Pb, Ni, V, Ag, Au, Mn, Zn and Bi is selectively doped to the optical fiber.

The radiation dosimeter according to the embodiment exhibits a linear optical loss response according to the irradiation of radiation and has a higher optical loss sensitivity than conventional optical fibers and thus can be used as an optical sensor for measuring radiation.

The dosimeter for radiation measurement according to the embodiment has an advantage that it has a high sensing effect with high reproducibility even when irradiated with a discontinuous radiation since the optical loss value is maintained without being recovered even after the irradiation of the radiation is completed.

 In addition, the embodiment can diagnose and measure accurate radiation without being influenced by surrounding magnetic field and electric field, and can be used in an environment of high temperature and high humidity and fire, and can be used not only in the atmosphere but also in water quality have.

1 is a graph showing the optical loss of optical fibers according to Examples and Comparative Examples;
2 is a graph showing the optical loss characteristics of the optical fiber according to the embodiment
FIG. 3 is a graph showing the amount of light loss according to the value of the radiation dose in relation to the optical loss characteristic of the optical fiber measured in FIG. 2
FIG. 4 is a graph showing the optical loss values of the optical fiber for radiation measurement according to the embodiment,
5 is a graph showing the optical loss value of the optical fiber for measurement of radiation according to the embodiment in accordance with the dose value (Gy)
6 is a graph showing a light absorption spectrum before and after irradiation of the optical fiber according to the embodiment
FIG. 7 is a graph showing a relationship between a change in optical loss according to a change in dose value with respect to a dose rate (Gy / min) of an optical fiber according to an embodiment and a relationship between a change in optical loss graph showing the
8 is a graph showing recovery characteristics with time after completion of irradiation of the optical fiber to the optical fiber according to the embodiment
9 is a schematic diagram of a radiation dosimeter having an optical fiber
Fig. 10 is a perspective view showing a full-beam type radiation dosimeter
Fig. 11 is a view showing a jumper cord type electro-optical radiation dosimeter
12 is a graph showing the optical loss characteristics of the jumper cord type electro-optical radiation dosimeter according to the embodiment
13 is a view showing an optical connector of an electromotive radiation dose meter
14 is a view showing an end portion of the optical connector of the electromotive radiation dosimeter

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments. In describing the present invention, a detailed description of well-known functions or constructions may be omitted for the sake of clarity of the present invention.

The present invention provides a dosimeter for measurement of radiation having an optical fiber having a low light recovery characteristic after light loss to perform radiation measurement. In general, optical fibers are physically and chemically stable due to their composition and structure, and can be installed and applied in places where high levels of radiation can be exposed, such as inside nuclear reactors and nuclear storage, and are suitable for remote monitoring at distances of several hundred meters Can be used.

Since the optical fiber based sensor uses optical signals, it is not affected by electromagnetic wave interference, and it has no fire risk due to characteristics such as insulation and inelimination, and can operate stably even in a high current and high voltage environment. The optical fiber sensor to the device for performing the radiation measurement measures the exposure of the radiation through the change of the optical loss according to the exposure of the radiation, and the measurement method and the configuration of the sensor system are simple and highly sensitive to light.

The silica glass-based optical fiber is composed of a core having a high refractive index and a cladding (SiO ₂ ) surrounding the core, which is doped with Ge for the total reflection condition of light. When an optical fiber is exposed to radiation such as gamma rays, high radiation energy breaks the Si-O bonds in the silica glass structure and forms ions and radicals of various structures, and other additives such as Ge and free electron- Defects of various structures associated with the pairs.

The defects formed in the optical fiber core and the cladding region due to irradiation show inherent optical absorption characteristics in the UV, VIS, and NIR regions. Accordingly, the radiation sensor using the optical fiber can detect the output light of the optical fiber due to various defects By measuring the change in loss, the dose of exposed radiation is measured to derive the amount of irradiated radiation.

In the case of the radiation measuring dosimeter using the conventional optical fiber, since the change of the optical loss due to the generation of defects due to the irradiation is relatively small and the optical loss recovery characteristic of the optical fiber is high, the radiation dose can not be measured with high accuracy, The present invention proposes a dosimeter using a radiation measuring optical fiber in which a change in optical loss is large even at a low irradiation dose and a recovery characteristic against light loss is low.

In the embodiment, aluminum (Al) is doped in the optical fiber core as a material having a relatively high light loss sensitivity due to radiation irradiation while satisfying the condition that light can be reflected and transmitted in the optical fiber. That is, the optical fiber according to the embodiment is doped to include Al for the condition for transmitting light in the optical fiber, and specific elements may be doped to increase the optical loss value.

The optical fiber may include at least one metal material selected from the group consisting of Co, Fe, Al, Ti, Cu, Pb, Ni, V, Ag, Mn, Region. ≪ / RTI >

It is also possible to use a rare earth element such as Tb, Yb, Er, Tm, Nd, Gd or Eu and a semiconductor compound such as CdMnTe, CdSe, PbSe or PbTe and at least one selected from P and B as dopants And can be doped into the optical fiber core region.

The material may be formed in a cladding region as well as in an optical fiber core region so as to have a predetermined diameter, and may be formed in a structure that can be influenced by radiation irradiation. Therefore, the light loss characteristic can be sensitively changed even when exposed to a relatively low radiation dose.

In the examples, an optical fiber core containing metal particles of Co, Fe, and Al, which is evaluated as the most preferable change value of optical loss by irradiation, was formed to prepare an optical fiber for radiation measurement. The optical fiber preform was drawn at a temperature of 1980 ℃ to extract the optical fiber with a diameter of 124 ~ 126μm and analyzed the diameter and refractive index distribution characteristics of the cladding and core of the drawn optical fiber. Preferably, the core diameter of the radiation measuring optical fiber according to the embodiment is 8.5 탆, and the refractive index difference between the core and the cladding may be 0.006. Hereinafter, the optical loss characteristics of the optical fiber fabricated as described above will be described, and it will be described that the embodiment can be advantageously used for radiation measurement.

FIG. 1 is a graph showing optical loss of an optical fiber according to an embodiment and a comparative example.

Referring to FIG. 1, an optical fiber was irradiated with a gamma ray using a radiation apparatus, and the optical loss change characteristics of the optical fiber fabricated as in the example were measured. The gamma ray irradiation was performed at a dose rate of 20 Gy / min for 60 minutes, and the total cumulative dose was set to 1200 Gy.

Radiation induced attenuation (RIA) of the optical fiber of the embodiment used for the radiation sensor by gamma irradiation can be calculated by using the output optical power P1 before gamma irradiation and the output optical power P2 during gamma irradiation using OSA Can be obtained by measuring at a wavelength of 1310 nm and dividing the difference by the length (l) of the optical fiber. {Optical loss value (RIA) dB / m = [P1 (dBm) - P2 (dBm)] / l (m)}

As a result of measuring the optical loss due to the irradiation of the gamma ray with respect to the optical fiber used for the radiation measurement, in the case of the conventional optical fiber of the comparative example, as the irradiation dose of the gamma ray increases, the value of the optical loss (RIA) increases but the rate of change decreases, And saturation tendency.

When the irradiation dose was 1200 Gy when the gamma ray was irradiated on the optical fiber for 60 minutes, the optical loss value of the optical fiber for radiation measurement according to the embodiment was 12.5 dB / m, which is 0.05 dB / m About 250 times higher.

In the case of the optical fiber doped with the metal (Co, Fe, Al) material as shown in the embodiment, the optical loss was linear according to the irradiation of the gamma ray, and the optical loss value was higher than that of the prior art. It can be interpreted as having high sensitivity to radiation.

When the irradiation of the gamma ray to the optical fiber was completed after 60 minutes, in the comparative example, the optical loss value by the gamma irradiation was restored again, that is, the optical loss value was decreased. However, in the optical fiber of the embodiment, the decrease of the optical loss value is remarkably reduced after 60 minutes of irradiation of the gamma ray, and the value is maintained at a constant value of 12.5 dB / m, which is the maximum value of the radiation irradiated onto the optical fiber. This means that the defects generated inside the optical fiber by the irradiation of the radiation keep the ratio of the defects constant over time.

That is, the optical sensor for radiation measurement according to the embodiment maintains the optical loss value without recovering even after completion of the gamma ray irradiation, so that the optical fiber having high reproducibility and sensitivity can be manufactured even when the discontinuous gamma ray is irradiated.

2 is a graph illustrating optical loss characteristics of an optical fiber according to an embodiment. Referring to FIG. 2, optical loss of an optical fiber exposed to radiation for a predetermined period of time in an optical fiber doped with a specific ion is shown. Gray (Gy) is the most commonly used unit of radiation energy, and 1 Gy is the absorbed dose when 1 kg of object absorbs 1 J of energy through radiation. A unit called rad (rd; rad) is used to indicate absorbed dose, and 1 rd represents 0.01 Gy.

In the embodiment, the change in optical loss with time was measured for each case while increasing the dose rate of the radiation to the optical fiber to 6.7 Gy / min, 18.4 Gy / min, 37.0 Gy / min, and 78.3 Gy / min . Specifically, considering the amount of light loss (dB / m) collected under the condition of annealing the optical fiber for 30 minutes after irradiation for 30 minutes, the change in optical loss in the irradiated region is linear , Respectively.

When the radiation dose rate is set to 6.7 Gy / min, up to 201 Gy, up to 551 Gy when set to 18.4 Gy / min, up to 1110 Gy with 78.0 Gy / min when set to 37.0 Gy / , The radiation is irradiated to the optical fiber up to 2348 Gy, and the optical loss is constantly increased with time.

From the point of time when the irradiation of radiation is completed, it can be seen that the amount of light loss is maintained at a constant value in each case and the decrease width with time is reduced. This is because the optical loss of the optical fiber exposed to the radiation is not restored to its original state, and the defects generated by the irradiation of the radiation in the optical fiber are not recovered and the optical loss characteristics are maintained.

FIG. 3 is a graph showing the amount of light loss according to the radiation dose value with respect to the optical loss characteristic of the optical fiber measured in FIG. In the case of the optical loss from 201 Gy to 2348 Gy according to the dose of radiation in each case as shown in FIG. 3, it is found that each experimental data irradiated with different dose ratio has a slope corresponding to the light loss amount This means that the sensitivity of the optical loss characteristic of the optical fiber is constant irrespective of the radiation dose.

As described above, the optical fiber for measuring radiation according to the embodiment of the present invention has a characteristic that the optical loss increases linearly when the radiation is exposed, and even when the radiation exposure is completed, Lt; / RTI > The embodiment is an optical fiber doped with a specific material including Al to have the characteristics described above, and a special optical fiber suitable for use as a sensor for measuring radiation can be provided.

FIG. 4 is a graph showing the optical loss values of the radiation measuring optical fiber according to the embodiment, by intervals. Referring to FIG. 4, irradiation of a gamma ray was performed at a dose rate of 6.7 Gy / min at intervals of 30 minutes, which is data obtained by irradiating multiple radiation to one radiation sensor. As shown in the figure, the optical fiber of the embodiment maintains the optical loss value according to the irradiation of the initial gamma ray even by discontinuous irradiation of the gamma rays, so that the radioactivity measurement can be performed with high reproducibility even when irradiating additional radiation. Therefore, even when the irradiation of the radiation to the optical fiber is discontinuously performed, the user can derive the amount of radiation exposure over time to a reliable result value.

FIG. 5 is a graph showing the optical loss value of the optical fiber for measurement according to the embodiment according to the dose value Gy, which is classified according to different wavelengths. Referring to FIG. 5, the optical loss value of the optical fiber was measured by dividing the wavelengths from 900 nm to 1600 nm, and it was confirmed that the optical loss was the largest at 900 nm with the smallest wavelength, and the optical loss value was decreased with increasing wavelength have. As described above, the optical loss value according to the wavelength can be differentiated according to the wavelength. In the embodiment, data on the optical loss value of the optical fiber manufactured in the wavelength range of 1310 nm is measured.

6 is a graph showing a light absorption spectrum before and after irradiation of an optical fiber according to an embodiment. Referring to FIG. 6, the optical absorption spectrum of an optical fiber doped with cobalt (Co) and iron (Fe) elements after irradiating with a dose of 201 Gy is shown, and a relatively large It can be confirmed that the light absorption characteristics are exhibited.

That is, the defects in the optical fiber doped with Al, Co, and Fe elements are relatively high in the visible region of 500 to 700 nm according to the irradiation of the same kind as the embodiment. It can be estimated that the sensitivity to optical loss of the optical fiber is relatively large, and as shown, the optical loss also depends on the wavelength.

FIG. 7 is a graph showing a relationship between a change in optical loss according to a change in dose value with respect to a dose rate (Gy / min) of an optical fiber according to an embodiment and a relationship between a change in optical loss Fig.

Here, the change (ΔRIA) of the optical loss according to the change in dose value (ΔDose) can be expressed as the sensitivity of the radiation dose. As shown in the figure, the sensitivity of the radiation dose of the optical fiber tends to decrease slightly as the dose rate of the optical fiber increases, and the variation of the optical loss with time changes linearly with the increase of the dose rate of the optical fiber .

8 is a graph showing recovery characteristics of optical loss values with time after completion of irradiation of the optical fiber according to the embodiment. Referring to FIG. 8, four cases are compared with each other in a case where the dose rate to be irradiated to the optical fiber is different. Assuming that the optical loss value at the time when the irradiation is completed is 1.0, the optical loss value of the optical fiber of the embodiment gradually decreases and maintains 0.9 level. It can be seen that the optical loss recovery level of the advancing optical fiber is similar in each case according to the dose rate of the optical fiber, and similar results can be obtained in the radiation measurement by adjusting the dose rate.

Figure 9 shows a schematic diagram of a dosimeter with a conventional optical fiber. Referring to FIG. 9, a radiation measuring dosimeter based on a conventional optical fiber is formed by inserting a material that reacts with radiation into an optical fiber end and an optical fiber interface. By measuring the change in output optical loss of the optical fiber due to various defects produced by exposure to radiation, the dose of exposed radiation is measured. Therefore, the light source part of the optical fiber input end is made up of LED, LD, etc., and a PD (photodiode) is provided at the output end of the light traveling along the optical fiber irradiated with the radiation.

In this embodiment, as described above, a dosimeter including an optical fiber doped with a dopant for changing a light loss characteristic in a core and a cladding region of the optical fiber is proposed. The dosimeter according to the embodiment may be formed as a badge type, a jumper cord type, or an optical connector type.

FIG. 10 is a perspective view showing a full-beam type radiation dosimeter. FIG. A badge-type dosimeter can be made into a box of a predetermined size so that it can be placed on a person's chest to measure the radiation dose received by the human body. Conventionally, a film is attached to the inside of a box, and the amount of exposure of a human body is measured by photographic action by radiation. However, in the embodiment, an optical fiber doped with special ions is linearly changed in accordance with irradiation with radiation do.

Referring to FIG. 10, the dosimeter 10 shown in FIG. 10 (a) has an input unit 11 and an output unit 12 for inputting and outputting light transmitted by a light source, respectively. The light input through the input unit 11 is moved to the output unit 12 through the optical fiber 13 and the optical signal collected at the output unit 12 is analyzed to derive the dose of the radiation.

(b) is provided with one input / output unit 21, and a mirror 23 for reflecting light is coated on an end of the input / output unit 21. The input / The light incident on the input / output unit 21 is reflected by the mirror 23 through the optical fiber, and then is output to the input / output unit 21 again.

11 is a view showing a jumper cord type electro-optical radiation dosimeter. Referring to FIG. 11, a specific optical fiber proposed in the embodiment, that is, an optical fiber which maintains a light loss value when the radiation is not irradiated while linearly increasing a change in optical loss due to irradiation of radiation, And shows a jumper cord type all-optical dosimeter formed.

The jumper cord type electro-optic fiber dosimeter described above determines the sensitivity to light passing through the optical fiber by adjusting the concentration of the additive material existing in the optical fiber core and the cladding layer region in order to increase the optical loss value according to the irradiation of radiation .

12 is a graph showing optical loss characteristics of a jumper cord type electro-optical radiation dosimeter according to an embodiment.

Referring to FIG. 12, there is shown a light loss measured by a radiation dosimeter in which a special optical fiber doped with Al, Co, and Fe is formed into a jumper cord type having a length of 400 mm in the optical fiber core as in the embodiment. The dose of radiation was set to 6.7 Gy / min. The radiation dose was measured for 30 minutes, and the light loss was measured for 30 minutes after the irradiation was stopped. As shown in the figure, the amount of change in the optical loss value with time of 30 minutes during which the radiation is irradiated increases with a linear gradient, and the maximum optical loss value accumulated by irradiation of radiation for 30 minutes after completion of irradiation is The results were kept constant.

Therefore, the radiation measuring dosimeter according to the embodiment can easily calculate the dose of radiation according to time, and can detect the accumulated dose of radiation even by discontinuous irradiation of the radiation.

Fig. 13 is a view showing an optical connector of an electric radiation dosimeter.

13, there is shown an optical radiation dosimeter in the form of an optical connector in which a core of an optical fiber is doped with the above-mentioned special ions and an optical fiber is formed to a predetermined length. As shown in the figure, since the length of the optoelectronic dosimeter formed in the connector shape is shorter than that of the jumper cord type dosimeter, the concentration of the special ions doped in the optical fiber core and the cladding region is controlled to change the optical loss value linearly , And can have a high response.

The total dose type radiation dosimeter of this embodiment can be classified into a Fiber Transmission System Connector (FC) type, a Subscriber Connector (SC) type, a ST (Straight Tip Connector) type, an LC (Lucent Connector) type, an MU ≪ / RTI > The FC type is a screw screw type, and a circular type screw is fixed. The SC type is a square type and the push type connection type. The ST type is a type that is connected by turning after pushing. The LC type is an RJ-45 It's like Jack.

For example, Absorption coeffcient values that can be compared to the doping concentration of the optical fiber provided in the LC-type and SC-type jeongwangsik radiation dosimeter is 5.792㎝ ^-1 and 20.563㎝ ^- a ^1, as compared to the jumper cord type dosimeter be set to a higher value .

As described above, the radiation measuring dosimeter manufactured by the optical connector type is smaller in size than the conventional dosimeter and is portable, and can be highly utilized in the field of measuring radiation.

Fig. 14 is a view showing an optical connector end portion of an electromotive radiation dosimeter.

Referring to FIG. 14, in manufacturing a radiation dosimeter in the form of an optical connector and a patch, an input / output terminal through which light is input / output is formed into one port to measure light. Thus, (APC: Angled Physical Contact) at an angle of?

The dosimeter proposed in the embodiment measures the optical loss through the reflected optical power of the optical signal transmitted from the Lase diode so that the light transmitted from the measuring unit 41 is input to the input unit 42 And the contact surface of the input / output unit 32 reflected through the optical fiber inside the dosimeter 31 may be formed as the APC surface to minimize the reflectance of the generated optical signal.

The optical connector of the dosimeter can be divided into AG (Air Gap), PC (Physical Contact) and APC (Angled Physical Contact) depending on the shape of the contact interface. AG is a form in which a predetermined space is formed between the optical connectors, PC is a shape in which the end contact surface of the optical connector is flat or curved, and APC is formed at a predetermined angle in the longitudinal direction of the optical connector.

Preferably, the cross-sectional angle of the APC connector may be 8 degrees, and the optical power reflected by the dosimeter in which the longitudinal section is polished can be lowered to -60 as described above. In the measuring section for measuring the optical power, Can be reduced.

As described above, the radiation measuring dosimeter according to the embodiment exhibits a linear optical loss response according to irradiation of radiation and has a higher optical loss sensitivity than conventional optical fibers, and thus can be used as an optical sensor for measuring radiation .

In the above description, the optical fiber of the embodiment is made of Al, Co, Fe, Al, Ti, Cu, Pb, Ni Ag, Mn, Zn and Bi may be additionally doped into the optical fiber core and the cladding.

As described above, the dosimeter for dosimetry including the doping element has a characteristic that the optical loss value is not recovered even after the irradiation of the radiation is finished, and the radiation dose is maintained at a constant value with time. Therefore, There is an advantage that the user can easily detect the information on the cumulative radiation dose.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications other than those described above are possible. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

As a radiation dosimeter for measuring the dose of radiation,
An optical fiber composed of a core region and a cladding region formed on the optical fiber base material so as to satisfy a total reflection condition of light;
A housing in which the optical fiber is embedded; And
And an optical connector formed at an end of the optical fiber and performing input / output of light,
A mirror for reflecting light is formed at the other end of the optical connector,
Wherein the core region is doped with metal particles of aluminum (Al), cobalt (Co), and iron (Fe) to increase the light loss value by irradiation with radiation. The method according to claim 1,
Wherein the optical loss value linearly increases with time while the optical fiber is irradiated with the radiation, and the optical loss value with time is kept constant when radiation irradiation is not performed. The method according to claim 1,
Wherein at least one of transition metal element materials including Ti, Cu, Pb, Ni, V, Ag, Au, Mn, Zn and Bi is selectively doped to the optical fiber. The method according to claim 1,
Wherein at least one of a rare earth element material containing Tb, Yb, Er, Tm, Nd, Gd and Eu and a compound containing CdMnTe, CdSe, PbSe and PbTe are additionally doped to the optical fiber, . The method according to claim 1,
Wherein the optical fiber has a linear slope of a light loss value according to a dose (Gy). 6. The method of claim 5,
Characterized in that the slope of the optical loss value according to the dose (Gy) is constant with respect to the dose rate of the radiation to the optical fiber. As a radiation dosimeter for measuring the dose of radiation,
An optical fiber composed of a core region and a cladding region formed on the optical fiber base material so as to satisfy a total reflection condition of light;
A jumper cord surrounding the optical fiber; And
And an optical connector formed at an end of the optical fiber and performing input / output of light,
Wherein the core region is doped with metal particles of aluminum (Al), cobalt (Co), and iron (Fe) to increase the light loss value by irradiation with radiation. 8. The method of claim 7,
And a longitudinal section of the optical connector is formed at a predetermined angle to reduce reflection loss of light. 8. The method of claim 7,
Wherein the optical loss value linearly increases with time while the optical fiber is irradiated with the radiation, and the optical loss value with time is kept constant when radiation irradiation is not performed. 8. The method of claim 7,
Wherein at least one of transition metal element materials including Ti, Cu, Pb, Ni, V, Ag, Au, Mn, Zn and Bi is selectively doped to the optical fiber.

Images