JP2011052992A - Body surface monitor and area entering and leaving managing system - Google Patents

Abstract

An object of the present invention is to provide a body surface monitor capable of preventing damage by minimizing the shaking of a monitor body even when an earthquake occurs, and ensuring the safety of a subject. And
In a body surface monitor 100 for measuring contamination of a body surface of a subject, a seismic isolation unit is provided in a base 2 below a monitor body 1.
[Selection] Figure 1

Description

  The present invention is a body surface monitor that is installed in a nuclear facility and inspects for the presence or absence of radioactive contamination on the body surface of a worker or the like (subject) entering or leaving a radiation control area, and an input using the body surface monitor. Retirement management system.

  The body surface monitor is installed near the boundary between the radiation control area (hereinafter referred to as the control area) and the non-control area, and measures the radioactive contamination of the body surface when the subject leaves the control area. And a plurality of detectors for detecting parts such as the head, hands, chest, abdomen, legs, and soles.

  When the body surface monitor detects that the subject to be withdrawn has approached the monitor entrance by using a mat switch, an optical sensor, or the like, the entrance door on the management area side provided in the monitor body is opened, and the body surface monitor is ready for measurement. Then, when the subject enters the monitor and completes the correct examination posture, the entrance door is closed and the head detector is lowered to a height position corresponding to the height of the examinee and measurement is started. .

Then, the detection signals from the detectors arranged so as to surround the subject are counted for a predetermined time, and the presence / absence of radioactive contamination on the body surface is compared by comparing the count value with the reference value for determination. Determine. When the measurement result is free of contamination, the exit door on the unmanaged area provided in the monitor body opens, and the subject can move out of the managed area. If the measurement result is contaminated, an appropriate treatment such as decontamination is performed on the subject, and then the measurement by the body surface monitor is performed again.
In addition, as this kind of body surface monitor, the thing of patent document 1 is known, for example.

JP 11-64522 A (paragraphs [0003] to [0005], FIG. 4)

By the way, since the conventional body surface monitor does not have a seismic isolation function, when an earthquake occurs, the subject under measurement may be frustrated even if it is a mild earthquake.
In addition, if a situation occurs in which the body surface monitor is damaged by an earthquake, management of entering and exiting the management area during recovery work from the earthquake disaster, management of exposure dose, and body surface contamination inspection at the time of withdrawal are extremely important. It may be complicated.
Furthermore, from the viewpoint of ensuring the safety of the subject and preventing external contamination by radioactive substances, it is required to take some measures against severe earthquakes.

  The present invention has been made in view of the above points, and can prevent damage by minimizing the shaking of the monitor body even in the event of an earthquake, and ensuring the safety of the subject. It is an object of the present invention to provide a body surface monitor and an entrance / exit management system capable of preventing external contamination by radioactive substances.

  The invention of claim 1 is a body surface monitor for measuring the contamination of the body surface of a subject, characterized in that a seismic isolation unit is provided at the lower part of the monitor body.

The invention according to claim 2 is the body surface monitor according to claim 1,
The seismic isolation unit includes a receiving portion fixed on a floor surface, a placing portion disposed to face the receiving portion, and a predetermined shearing force that breaks the receiving portion and the receiving portion. And a stopper member that enables relative movement in the horizontal direction, and the monitor main body is supported by the mounting portion.

The invention of claim 3 is the body surface monitor according to claim 2,
The base in which the monitor main body is installed is partitioned by a rectangular partition plate provided with cutouts at four corners, and placed on the partition plate, the first and second accommodating portions formed vertically. And a sole detector incorporated in the first housing portion, a cover that covers the top surface of the foot detector, and four corners of the second housing portion, Each of the stopper members of the four seismic isolation units from the notches of the partition plate in a state in which the cover and the sole detector are removed. A seismic isolation unit is incorporated so as to be exposed.

The invention of claim 4
A monitor body installed near the boundary between the radiation control area and the non-control area, an entrance door and an exit door provided in the monitor body, door control means for controlling opening and closing of these doors, and the monitor body A radiation detector, a counting means for counting a detection signal from the radiation detector for a predetermined time, a determination means for comparing the count value from the counting means with a reference value for determination and determining the presence or absence of body surface contamination, In a body surface monitor that measures the contamination of the body surface of a subject,
A seismic sensor for detecting an earthquake is provided, and when the occurrence of an earthquake exceeding a predetermined seismic intensity is detected by the seismic sensor during contamination measurement, the door control means controls to open the entrance door and the exit door. A signal is transmitted.

The invention of claim 5
It is installed at the entrance / exit of the radiation control area and performs the entrance qualification process based on the information of the ID card held by the subject, while the internal exposure measurement result by the dosimeter and the body surface contamination measurement by the body surface monitor Based on the result and the exit qualification determination process, the entrance / exit management device that controls the passage of the subject by controlling the opening / closing of the entrance / exit gate according to the determination result, and this entrance / exit management device In an entrance / exit management system equipped with a tube calculator that sends and receives data between
When a seismic sensor for detecting the occurrence of an earthquake is provided in the radiation control area, and the seismic sensor detects an occurrence of an earthquake of a predetermined seismic intensity or higher, the discharge calculator is connected to the entrance / exit area management device. A control signal is sent to open the entrance / exit gate.

The invention of claim 6 is the entrance / exit management system according to claim 5,
The discharge computer is equipped with a database for storing the personal identification data of the subject transmitted from the entrance / exit management device and data related to the entrance / exit processing, and collates records about the entrance date / time and the exit date / time. It has a function of extracting a subject who has not completed the withdrawal process and outputting the list to the outside.

According to the body surface monitor of the present invention, even if an earthquake occurs, the body surface monitor can be minimized to prevent the device from being distorted or toppled, and the body surface monitor function can be maintained. it can.
In addition, since the stopper part of the seismic isolation unit is exposed by simply removing the sole detector housed in the body base of the body surface monitor, it is possible to easily replace the stopper that has been broken due to the occurrence of an earthquake. Work is easy.
When a large earthquake occurs during contamination measurement, the locked entrance door and exit door are automatically opened so that the subject can evacuate without operating the emergency call switch. Therefore, it becomes possible to ensure the safety of the subject.
Furthermore, according to the entrance / exit management device system of the present invention, when an earthquake occurs, in addition to opening the entrance / exit gate of the entrance / exit management device, from the radiation control area without finishing the exit processing. By providing a function to output a list (file) for identifying the evacuated subject, the body surface contamination of the subject can be measured with a body surface monitor that retains the function after the earthquake, as in the conventional system. Therefore, it is possible to reliably control the exposure dose and prevent external contamination by radioactive materials.

It is a perspective view showing the outline of the body surface monitor by one embodiment of the present invention. It is a block diagram of the body surface monitor of FIG. It is a disassembled perspective view which shows the structure of the base of the body surface monitor of FIG. It is sectional drawing along the AA line of the base of FIG. It is a flowchart which shows operation | movement of a body surface monitor. It is a flowchart which shows the interruption process at the time of the occurrence of an earthquake. It is a figure which shows the outline | summary of the entrance / exit management system by one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing the appearance of the body surface monitor of the present embodiment. FIG. 2 is a block diagram showing the configuration of the body surface monitor. This body surface monitor 100 includes a base 2 that supports a rectangular parallelepiped monitor body 1, a head detector 3, a front surface (face, chest, abdomen, Front leg) detector 4, back (back of head, back, back of leg) detector 5, hand detector 6, side detector 7, sole detector 8, display 9, seismic sensor 10, entrance door 11a, An exit door 11b is provided.

As shown in FIG. 2, the radiation detectors of the head detector 3, the front detector 4, the back detector 5, the hand detector 6, the side detector 7, and the sole detector 8 are connected via the I / O 12. It is connected to the central processing unit 13. The central processing unit 13 performs various processes including contamination determination that compares the output from each radiation detector with a preset reference value.
Further, the central processing unit 13 includes a seismic sensor 10 for detecting the occurrence of an earthquake, a lifting mechanism driving unit 14 for adjusting the head detector 3 to a height position corresponding to the height of the subject, an entrance door 11a. And a door opening / closing mechanism driving unit 15 for opening and closing the exit door 11b, a display unit 9 for displaying measurement guidance and measurement results, and an ID card reading unit 16 for reading data recorded on an ID card carried by the subject. Etc. are connected.

  Further, as shown in FIGS. 3 and 4, the interior of the base 2 that supports the monitor main body 1 is partitioned by a rectangular partition plate 2b provided with cutouts 2a at the four corners. It is divided into two housing parts. The upper first accommodating portion 2c accommodates the sole detector 8 so as to be placed on the partition plate 2b, and the upper surface of the sole detector 8 is covered with a cover 2f. A total of four seismic isolation units 70 are arranged in the lower second accommodating portion 2 d, and the frame portion lower surface 2 e extending along the long sides on both sides of the base 2 is placed on the placement portion 71 of the seismic isolation unit 70. To support. A concave portion is formed on the upper side of the base 2, and the monitor main body 1 is installed so as to be fitted to the concave portion and is fixed to the base 2 with screws.

The seismic isolation unit 70 includes a receiving portion 71 fixed on the floor of the management area, a mounting portion 72 disposed to face the receiving portion 71, and a stopper pin 73. In the seismic isolation unit 70, a movable body fixed to the mounting portion 72 and movable along a guide region formed in the receiving portion 71, and a spring (damping for applying a damping force to the movable body) Member) or the like is incorporated.
The stopper pin 73 is inserted so that both ends thereof are inserted into holes formed in both members of the mounting portion 72 and the receiving portion 71 and the shaft core is directed in the vertical direction. The horizontal movement of the mounting portion 72 that contacts the frame lower surface 2e of the base 2 of the body surface monitor and the receiving portion 71 fixed on the management area floor surface is restricted by the stopper pin 73. Yes.

  Here, when an earthquake exceeding a predetermined seismic intensity occurs and the shearing force applied to the stopper pin 73 exceeds a predetermined value as the monitor body 1 shakes, the stopper pin 73 breaks, and the mounting portion 72 and the receiving portion The horizontal movement with respect to 71 is possible. When the stopper pin 73 is broken, the vibration of the monitor main body 1 is attenuated by the above-described attenuation means incorporated in the seismic isolation unit 70. In this seismic isolation unit 70, the diameter and material of the pin are selected so that the stopper pin 73 is broken by an earthquake exceeding “seismic intensity 5”.

  The replacement operation of the stopper pin 73 is performed by removing the cover 2f on the upper surface of the base and the sole detector 8 accommodated in the first accommodating portion 2c. In the body surface monitor 100 according to the present embodiment, the second pin so that the stopper pins 73 of the four seismic isolation units 70 are exposed from the notches 2a of the partition plate 2b in a state where the cover 2f and the sole detector 8 are removed. Since the seismic isolation unit 70 is incorporated in the housing portion 2d, the stopper pin 73 can be easily replaced without lifting the monitor main body 1.

Next, the operation of the body surface monitor of this embodiment will be described. FIG. 5 is a flowchart showing the monitoring operation (automatic mode).
When the subject selects the automatic mode with the operation button displayed on the screen of the display unit 9 of the body surface monitor 100, first, the background value (BG count value) is measured prior to the measurement of the body surface contamination. (S1). When the subject holds the ID card over the ID card reading unit 16 and gets on the entrance mat (not shown) and the mat switch is turned on (S2), the entrance door 11a is confirmed to be opened and closed (S3). If the door 11a is closed, it is opened (S4).

  Then, when the foot is set at a fixed position by the human body detection sensor provided in the monitor body 1 and it is confirmed that the subject has entered the body surface monitor (S5), the entrance door 11a is closed, The head detector 3 is lowered (S6). The head detector 3 descends to a height position corresponding to the height of the subject and stops based on the personal identification number and height data read from the ID card.

  When it is confirmed that the subject's hand is set in the insertion portion of the hand detector 6 (S7) and the correct posture is taken, measurement of body surface contamination is started (S8). The detection signals from the radiation detectors arranged so as to surround the subject are counted for a predetermined time (S9), and when the measurement is completed (S10), the head detector 3 is raised (S11). The counting time is determined according to the background value.

  Then, the presence / absence of radioactive contamination on the body surface is determined by comparing the count value with the reference value for contamination determination set in advance (S12). When the determination result is “no abnormality”, the exit door 11b provided in the monitor body 1 is opened (S13), and the subject can move out of the management area. When the exit mat switch is turned on when the subject gets on the unillustrated exit mat (S14), the exit door 11b is closed (S15). If the mode is the entrance door open mode (S16), the entrance door 11a is opened (S17), and the preparation for body surface contamination measurement for the next subject is made.

  If the result of the contamination determination (S12) is “contaminated”, the contaminated part and the degree of contamination are displayed on the display unit 9, printed out as necessary, and the entrance door 11a is opened (S121). The subject goes out of the entrance door 11a, cleans the contaminated part, and is again examined by the body surface monitor. In the case of “contaminated”, the personal identification number and the result of contamination measurement are transmitted to the tube calculator described later.

Here, the operation and processing of the body surface monitor when an earthquake occurs will be described with reference to the flowchart of FIG. This process is executed as an interrupt process regardless of what state the body surface monitor 100 is in.
When the seismic sensor 10 detects the occurrence of an earthquake, the body surface monitor 100 takes in the output of the seismic sensor 10 (S20) and compares the value of this output signal with a preset abnormality determination threshold value (S21). . If it is detected that an earthquake exceeding a predetermined seismic intensity has occurred, the measurement is immediately stopped (S22), and it is confirmed whether the head detector 3 is in the initial position (upper limit position) (S23). If it is not in the position, the elevating mechanism 14 is driven to raise the head detector 3 (S24). Next, the door opening / closing mechanism 15 is driven to open the entrance door 11a and the exit 11b door (S25), and the personal identification number of the subject whose measurement is interrupted is transmitted to the discharge tube computer connected to the body surface monitor 100. To do.

  According to the body surface monitor 100 of this embodiment, when a large earthquake occurs during contamination measurement, the entrance door 11a and the exit door 11b that are locked are automatically opened after the start of the measurement operation so that the subject can evacuate. Therefore, the safety of the subject can be ensured.

Next, an entrance / exit management system using the above-described body surface monitor will be described.
FIG. 7 is a diagram showing an outline of the entrance / exit management system. The entrance / exit area management system 200 according to this embodiment includes a dosimeter lending device 20, a dosimeter 30, an entrance / exit area management device 40, a work information input device 50, a body surface monitor 100, and a discharge tube computer 60. In addition, the entrance / exit area management device 40 and the body surface monitor 100 are connected to a discharge computer 60 installed on the monitoring room side outside the management area via a bus 61. Moreover, the solid line arrow in a figure shows the movement path | route of the subject in a nuclear facility.

  The dosimeter lending device 20 is installed on the way to the management area, and stores and stores a plurality of wireless personal dosimeters 30. When a subject who is scheduled to work in a controlled area inserts an ID card possessed by the dosimeter lending device 20 and reads information including an individual identification number such as an employee number, the dosimeter lending device 20 writes the personal identification number in the personal dosimeter 30 and then lends the personal dosimeter 30 to the subject (so that it can be taken out). The personal dosimeter 30 determines the consistency of the personal identification number on the dosimeter side when performing wireless communication with devices installed in the management area so as to eliminate erroneous communication due to interference.

The subject takes out the personal dosimeter 30 from the dosimeter lending device 20 and puts it in the chest pocket, and then goes to the entrance / exit management device 40 installed at the boundary of the management area.
The entrance / exit management device 40 reads the information of the subject's ID card, refers to the information of the subject stored in the discharge tube computer 60 based on the personal identification number, and enters the management area. Confirm regional qualifications (history of radiation protection education, expiry date of medical examination, etc.).

  The entrance / exit management device 40 wirelessly communicates with the personal dosimeter 30 carried by the subject after confirming the entrance qualification, and transmits data such as “accessible time and alarm set value” transmitted from the discharge tube computer 60. While writing in the personal dosimeter 30, the entrance / exit gate 41 provided in the management apparatus is opened to allow the subject to pass (enter). At this time, data is transmitted from the entry / exit management device 40 to the discharge computer 60, and the personal identification number of the subject who entered the management area and the entry date / time are recorded in the discharge computer 60.

  Next, the subject goes to the work area in the management area and performs the work to be performed. Prior to the work, the subject inputs information such as the work title and work start time to the personal dosimeter 30 using the work information input device 50 installed at the work place. The personal dosimeter 30 measures and records the internal exposure dose of the subject due to the current work.

After completing the work, the subject goes to the body surface monitor 100 installed in the passage that leads to the outside of the management area, and is inspected for body surface contamination as described above. In FIG. 7, only one body surface monitor 100 is shown. However, in a large-scale nuclear facility, usually, 7 to 8 body surface monitors are installed. It is operating at the same time. The measurement result of the body surface contamination is transmitted to the discharge tube computer 60.
Thereafter, the subject exits from the exit door of the body surface monitor 100 that also functions as a gate (door on the non-management area side) and heads toward the entrance / exit management device 40.

It is necessary to confirm that the body surface contamination measurement result and the internal measurement result are below the reference value when leaving the management area. The subject to be withdrawn is provided in the entrance / exit management device 40. The personal dosimeter 30 is set in the dosimeter reading unit 42.
The entrance / exit area management device 40 reads the measurement data of the internal exposure dose from the personal dosimeter 30, and if there is no problem in the exposure dose, the entrance / exit gate 41 is opened to allow the subject to pass (withdraw). At this time, data is transmitted from the entry / exit management device 40 to the discharge computer 60, and the personal identification number of the subject who has been withdrawn and the withdrawal date / time are recorded in the discharge computer 60. The subject who has completed the withdrawal process returns to the place where the dosimeter rental apparatus 20 is installed and returns the personal dosimeter 30.

  When the seismic sensor 10 detects the occurrence of a large earthquake, the body surface monitor 100 opens the entrance door 11a and the exit door 11b of the monitor, and at the same time, the discharge computer 60 A control signal is sent to the entrance / exit management device 40 so that the entrance / exit gate 41 is opened. Therefore, when an earthquake occurs, all persons entering the management area, including the subject whose contamination is being measured in the body surface monitor 100, can be immediately evacuated to a predetermined evacuation site. .

  The discharge tube computer 60 also includes a subject database that stores information such as “name, affiliation, gender, personal identification number” regarding the subject (worker), “work execution date, work subject, work location, work The database includes a work content database that stores information such as “persons, entry and exit dates and times, exposure dose”, and an anomaly information database that stores information such as “date and time of earthquake occurrence, seismic intensity”.

  The discharge tube computer 60 uses the information stored in the database to check the records of the entry date and the exit date for the subject who entered the management area on the day of the earthquake, and performs the exit process. It has a search output function that extracts subjects without completed records and outputs the list to the outside.

Based on the list output from the discharge tube computer 60, the business operator (management company) that manages the subject is matched with the resident who has evacuated to a predetermined evacuation site, and has not been retreated. For all examiners, confirmation of exposure information and measurement of surface contamination using a survey meter or body surface monitor will be performed to confirm the presence or absence of external contamination of radioactive materials. If this measurement result is accumulated in the discharge tube computer 60, the exposure dose can be managed without any problem as in the conventional system.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, a dosimeter reading unit is provided on the body surface monitor, and measurement data on internal exposure dose is collected simultaneously with the measurement of body surface contamination, and the exit qualification determination result is transmitted to the entrance / exit management device. The seismic sensor may be installed at an appropriate place in the management area separately from the body surface monitor.

100: body surface monitor, 1: monitor body, 2: base, 10: seismic sensor,
11a: entrance door, 11b: exit door, 20: dosimeter lending device, 30: personal dosimeter,
40: Entry / exit management device, 41: Entry / exit management gate, 60: Release tube calculator,
70: Seismic isolation unit, 73: Stopper pin, 200: Entrance / exit management device system.

Claims (6)

  A body surface monitor for measuring contamination of a body surface of a subject, wherein a seismic isolation unit is provided at a lower portion of the monitor body. The seismic isolation unit includes a receiving portion fixed on a floor surface, a placing portion disposed to face the receiving portion, and a predetermined shearing force that breaks the receiving portion and the receiving portion. A stopper member that enables relative movement in the horizontal direction, and supports the monitor main body at the mounting portion.
The body surface monitor according to claim 1. First and second storage portions formed vertically so as to partition the inside of the base on which the monitor main body is installed with a rectangular partition plate provided with cutouts at four corners;
A sole detector mounted on the partition plate and incorporated in the first accommodating portion;
A cover covering the upper surface of the sole detector;
Four seismic isolation units arranged at the four corners of the second housing part and supporting the lower surface of the frame part of the base at the placement part,
In a state where the cover and the sole detector are removed, the seismic isolation unit is incorporated so that each stopper member of the four seismic isolation units is exposed from the notch of the partition plate.
The body surface monitor according to claim 2. A monitor body installed near the boundary between the radiation control area and the non-control area, an entrance door and an exit door provided in the monitor body, door control means for controlling opening and closing of these doors, and the monitor body A radiation detector, a counting means for counting a detection signal from the radiation detector for a predetermined time, a determination means for comparing the count value from the counting means with a reference value for determination and determining the presence or absence of body surface contamination, In a body surface monitor that measures the contamination of the body surface of a subject,
A seismic sensor for detecting an earthquake is provided, and when the occurrence of an earthquake exceeding a predetermined seismic intensity is detected by the seismic sensor during contamination measurement, the door control means controls the door to open the entrance door and the exit door. Send
Body surface monitor characterized by that. It is installed at the entrance / exit of the radiation control area and performs the entrance qualification process based on the information of the ID card held by the subject, while the internal exposure measurement result by the dosimeter and the body surface contamination measurement by the body surface monitor Based on the result and the exit qualification determination process, the entrance / exit management device that controls the passage of the subject by controlling the opening / closing of the entrance / exit gate according to the determination result, and this entrance / exit management device In an entrance / exit management system equipped with a tube calculator that sends and receives data between
A seismic sensor is provided in the radiation control area to detect the occurrence of an earthquake, and when the seismic sensor detects the occurrence of an earthquake of a predetermined seismic intensity or higher, the discharge calculator is connected to the entrance / exit area management device. On the other hand, a control signal is sent to open the entrance / exit gate.
An entrance / exit management system characterized by that.   The discharge tube computer includes a database for storing the personal identification data of the subject transmitted from the entrance / exit management device and data related to the entrance / exit processing, and collates records of the entrance date / time and the exit date / time. 6. The entrance / exit management system according to claim 5, wherein the entrance / exit management system has a function of extracting a subject who has not completed the exit processing and outputting the list to the outside.