JPS5932937Y2 - thermal fluorescence dosimeter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a thermal fluorescence dosimeter carried by each worker in order to measure the amount of radiation exposure of workers handling radioactive materials.

Thermal fluorescent dose element (hereinafter referred to as element) exposed to radiation
When heated, this element emits fluorescent light corresponding to the exposure dose.

The exposure dose can be determined by converting this fluorescence into an electrical signal using a photomultiplier tube or the like.

Conventional thermal fluorescence dosimeters were often carried as measurement badges on the chest of radiation workers, but since the amount of radiation exposure differs in each part of the body, this is not suitable for strict control. It is enough.

In particular, hands and fingers are more likely to be exposed to radiation than other parts of the body, so a hand-worn thermal fluorescence dosimeter is particularly needed.

In reality, thermal fluorescence dosimeters are carried by many workers at nuclear power plants, etc., so in order to manage the amount of radiation exposure, it is necessary to automatically measure the radiation exposure dose and at the same time automatically read the ID code of the person carrying the device. This is necessary at the same time.

However, when measuring a dosimeter with a finger-worn ring, such as a conventional hand-worn thermal fluorescence dosimeter (hereinafter referred to as a dosimeter), it is difficult to put the ring on the measuring device, and it is difficult to remove the ring from the ring. The dosimeter element had to be removed and then exposed to the measuring machine, which required a great deal of effort.

In addition, the dosimeter with such a pull-out structure cannot record information such as an ID code due to the size limitation of being worn on the hand, and this also makes handling complicated and leads to many errors.

Furthermore, conventional dosimeters require a measuring device with complicated configurations such as intermittent feeding of the dosimeter using a magazine or the like, and transfer and positioning of the thermofluorescent dosimeter to the measuring section.

The present invention eliminates the above-mentioned drawbacks of the conventional methods, and provides a hand-worn heat lamp that can be placed in a measuring machine with the ring attached, has information such as an ID code, and can be automatically measured with a simple device. The purpose is to provide a light dosimeter.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIGS. 1 to 5, 1 is a holder main body, and a through hole 2 is formed in this holder main body 1.

A thermal fluorescent element 3 is fixed to the step inside this through hole 2 (.
Ru.

The structure of this thermal fluorescent element 3 is shown in FIG.

In FIG. 4, reference numeral 3a denotes a base placed on a step in the through hole 2 of the holder main body 10, and the base 3a is made of an opaque polygon film deposited with aluminum.

Carbon is deposited on the lower surface of the base 3a to improve heat absorption efficiency during optical heating.

3b is a thermoluminescent material fixed with adhesive on one side of the base 3a, 3c is a dome-shaped cover inserted into the through hole 2, and this cover 3c is formed of a transparent polyurethane film.

This cover 30 prevents dust and the like from the outside from adhering to the thermal fluorescent material 3b.

3d is a fixing ring, and by press-fitting this fixing ring 3d into the through hole 2, the base 3a and the cover 3c are held between the stepped portion in the through hole 2 and the fixing ring 3d.

In FIGS. 1 to 3, reference numeral 4 denotes a finger attachment ring provided on the holder body 1, and by inserting the finger into this ring 4, the holder body 1 is attached to the finger.

Reference numeral 5 denotes a flat guide hole formed in a direction perpendicular to the axis of the through hole 2 of the holder main body 10, and a protrusion 6 protruding into the guide hole 5 is provided on the lower surface portion forming the guide hole 5.
is formed.

T is a light-shielding plate inserted into the guide hole 5. The light-shielding plate 1 closes the through-hole 2 and prevents external light from entering the thermal fluorescent element 3.

Note that the direction in which the light shielding plate γ is inserted into the guide hole 5 is a direction perpendicular to the direction of the finger device toward the ring 4.

Further, the light shielding plate γ inserted into the guide hole 5 is held by the protrusion 6 with an appropriate frictional force.

8 and 8' are dosimeter sliding surfaces formed on the side of the holder body 10, and these dosimeter sliding surfaces 8 and 8' are formed in a direction parallel to the direction in which the finger is attached to the ring 4. There is.

Reference numeral 9 denotes a plurality of information holes formed in the holder main body 1, and each of the information holes 9 is provided with a thin wall portion 9a as shown in FIG. Information such as an ID code is recorded by a combination of holes and blind holes.

Information is read by the information hole 9 by emitting light from one side of the information hole 9 and detecting this light by a sensor placed on the other side of the information hole 9. It is an inclined surface formed on the side of the force, and this inclined surface 10
is formed to prevent the dosimeter from being inserted in the opposite direction when the dosimeter is stored in the measuring device.

Reference numeral 11 denotes a group of numbers such as an ID code engraved on the top surface of the holder main body 1, and the information can also be read by visually observing this group of numbers.

When the illustrated dosimeter is housed in the measuring device, the dosimeter is guided by the sliding surfaces 8, 8', slid in the direction in which the dosimeter is attached to the finger, and is supplied to the measuring section.

In the measurement section, the light shielding plate γ is removed.

In this state, the base 3a side of the thermal fluorescent element 3 is irradiated with light from the infrared lamp, the thermal fluorescent material 3b is heated, and the thermal fluorescent material 3b generates fluorescence according to the radiation exposure dose. do.

This fluorescent light passes through the cover 30 and is detected to measure the radiation exposure dose.

After the measurement, the light shielding plate 7 is inserted into the guide hole 5 again to close the through hole 2.

The thermal fluorescence dosimeter of the present invention has the above configuration, and the present invention has the following effects.

(1) By providing a sliding surface on the holder body, when measuring by holding the dosimeter up to a measuring device, for example, by providing a sliding guide surface corresponding to the dosimeter sliding surface on the measuring device side, the ring It can be easily stored in the measuring device with the holder attached.

(2) Since the dosimeter sliding surface is parallel to the direction of force applied to the hand (orthogonal to the ring surface), the rings can be stored in the measuring device without getting entangled with each other, and automatic feeding of the dosimeter is also easy. be.

(3) The thermal fluorescent element is attached to the holder body, and the light-shielding plate that blocks the element is slidably held perpendicular to the dosimeter sliding surface, eliminating the need to remove the element from the holder as in the conventional case. This does not require any labor or a mechanism for transporting the measuring device, and the light shielding plate can be easily attached and detached using an ejector plate or the like that is located on the dosimeter sliding surface and operates perpendicularly thereto.

(4) Unlike conventional methods, the element is not attached or detached from the dosimeter holder, so there is no overlap in space due to attachment or detachment, making it easy to attach information such as an ID code to the dosimeter even in the limited space available for wearing on the hand. It is.

[Brief explanation of the drawing]

Fig. 1 is a top view of a thermal fluorescent dosimeter according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line AA in Fig. 1, and Fig. 3 is a cross-sectional view taken along line B in Fig. 1.
The force-direction-arrow diagram, FIGS. 4 and 5 are enlarged cross-sectional views of the main parts of the thermal fluorescence dosimeter of the present invention, respectively. 1...Holder main body, 2...Through hole,
3...Thermal fluorescent element, 3a...Base,
3b...Thermal fluorescent material, 3c...Cover, 3d...Fixing ring, 4...Ring for finger attachment, 5... Guide hole, 6...
Protrusion, γ... Light shielding plate, 8. G...Dosimeter sliding surface, 9...Information hole, 9a...Thin wall part, 10...Slanted surface, 11...Number group.

Claims (2)

[Scope of utility model registration request] (1) A dosimeter sliding surface formed on the main body of the holder having a finger-wearing ring parallel to the direction in which the finger is attached to the hand-wearing ring, and a dosimeter sliding surface formed on the holder main body parallel to the direction in which the finger is attached to the hand-wearing ring; a through hole formed in a direction perpendicular to the dosimeter sliding surface; a guide hole formed in the holder main body in a direction perpendicular to the dosimeter sliding surface; and a thermal fluorescent element held in the through hole. A thermal fluorescence dosimeter comprising: a light plate that is slidably held in the guide hole and closes the through hole; and an information recording section formed on the holder main body. (2) Scope of Utility Model Registration In the thermal fluorescent dosimeter described in claim 1, the thermal fluorescent element is comprised of a heat-resistant base on which a thermal fluorescent material is attached, and a transparent base that covers the thermal fluorescent material. A thermal fluorescence dosimeter comprising: a cover; the base is disposed on the side of the finger-wearing ring; and the cover is disposed on the side of the light-shielding plate.