JP2004117372A - Radiation measuring system and personal dosimeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly control personal radiation exposure, to control personal exposure of an operator with no expert knowledge, and to make a commander determination properly on the side of an controlling apparatus. <P>SOLUTION: The radiation measuring system comprises a plurality of personal dosimeters 10 and the controlling apparatus. The dosimeter 10 comprises a head unit 12 mounted on a helmet and a main body 14 attached to a breast pocket of an operator. The main body 14 is provided with a microcomputer 46 which calculates a dose rate and an integral dose. In accordance with a notification condition table, a proper notification condition according to the combination of each value of the dose rate and the integral dose is selected. Then, a message based on the notification condition is outputted from a speaker 70 through a voice synthesizing unit 68. The head unit 12 is provided with a position detector 72 and an imaging device 74. Measurement results, position information, and image information are transmitted to the controlling apparatus (not shown). <P>COPYRIGHT: (C)2004,JPO

Description

(4) The present invention relates to a radiation measurement system and a personal dosimeter.

Personal dosimeters are carried by workers at nuclear power plants, nuclear fuel processing facilities, radiation handling facilities, etc. to control each worker's exposure. Specifically, a personal dosimeter is attached to a worker's breast pocket (for a man) or abdomen (for a woman), and the dose rate and the integrated dose are measured in that state. Some personal dosimeters output an alarm or generate vibration when the integration rate or the integrated dose exceeds a certain value. When such notification is made, the worker confirms the dose rate and the integrated dose displayed on the display unit of the dosimeter, and then evacuates from the work area.

By the way, if an accident occurs in a facility that handles radiation, firefighters, rescue workers, police officers, etc. will enter the facility or its vicinity. Although such professionals generally have some knowledge, it is still desirable to take steps to better manage exposure in the event of an emergency. In addition, general workers are required to wear personal dosimeters in operations such as reactor dismantling, but it is necessary to ensure that even those with little knowledge of such radiation control exposure. In particular, measures must be taken to ensure the safety of workers in an emergency.

The dosimeter's measurement results include the dose per unit time (dose rate) and the integrated value of the dose up to now (integrated dose). The situation is determined after understanding the meaning of those values. It is indispensable to have specialized knowledge and legal knowledge. Even without such knowledge, and without knowing how to read the display value, measures are needed to grasp the situation appropriately. Further, if the monitoring side knows the position of the worker and the surrounding situation, it is possible to determine the continuation of work, withdrawal, evacuation, etc. at an appropriate timing.

JP-A-61-050085 JP 05-223944 A JP-A-04-262290

(4) An object of the present invention is to appropriately manage personal exposure.

Another object of the present invention is to appropriately manage personal exposure of workers who do not have specialized knowledge.

Another object of the present invention is to enable a commander to make an appropriate decision on the management device side.

(1) Desirably, the radiation measurement system includes a radiation sensor, a dose rate calculation unit that calculates a dose rate based on a detection signal of the radiation sensor, and an integration that calculates an integrated dose based on a detection signal of the radiation sensor. The apparatus includes a dose calculation unit and a notification unit that performs notification in accordance with a combination of each of the dose rate and the integrated dose.

According to the above configuration, the notification can be performed according to the combination of the current radiation dose and the exposure dose up to that time. For example, the notification makes it possible to accurately determine the situation even for a person with little specialized knowledge.

Preferably, the notifying means outputs a message having contents corresponding to a combination of each value of the dose rate and the integrated dose. The message may be reproduced by voice synthesis. It is desirable to prepare a plurality of message contents according to the situation, and to output an appropriate one from among them according to the situation.

Preferably, the output cycle of the message is variably set according to a combination of each value of the dose rate and the integrated dose. By varying the output cycle, the degree of psychological influence can be adjusted.

Preferably, the output means determines an increasing tendency or a decreasing tendency of the dose rate, and considers the determination result of the increasing tendency or the decreasing tendency in outputting the measurement result. Considering the time change of the dose rate, a more appropriate message can be provided.

Preferably, the output unit outputs at least one of an output of a voice message, driving of a light emitting element array, generation of vibration, and output of a buzzer sound according to a combination of the respective values of the dose rate and the integrated dose. Execute. In particular, it is desirable to select one or a plurality of means from a plurality of means according to the degree of risk of the situation.

(2) Preferably, the radiation measuring system is a personal dosimeter carried by a worker, the radiation sensor; a dose rate calculating means for calculating a dose rate based on a detection signal of the radiation sensor; The integrated dose calculating means for calculating an integrated dose based on a detection signal of a sensor, and a notifying means for performing notification in accordance with a combination of each value of the dose rate and the integrated dose, the notifying means including the worker Is located near the head.

According to the above configuration, the notification is performed in the ear, below the ear, or in the vicinity thereof. Preferably, the output means is provided on a helmet of the worker. Preferably, the output means is a speaker provided on a helmet of the worker. The helmet is usually worn, and if the notification means is fixed to the helmet, forgetting to wear the notification means can be prevented.

(3) Preferably, the personal dosimeter includes a dosimeter main body mounted on a worker's body and a head unit provided on a worker's helmet, wherein the dosimeter main body is a radiation sensor. And a first communication unit that transmits a measurement result of the radiation sensor, wherein the head unit is a second communication unit that communicates with the first communication unit, and the head unit that is output from the second communication unit. Notification means for performing notification according to the measurement result of the radiation sensor.

According to the above configuration, while measuring the dose at a site on the body surface that is stipulated by law, the head unit can notify the vicinity of the head. The dosimeter main unit and the head unit are connected by a wired method or a wireless method, but the latter is desirable. Preferably, the output means outputs a message having contents corresponding to a combination of each value of the dose rate and the integrated dose as the measurement result.

(4) In order to achieve the above object, the present invention is a system comprising a personal dosimeter carried by a worker and a management device for managing the personal dosimeter, wherein the personal dosimeter is Includes a radiation sensor, a position detector that detects position information of the personal dosimeter, and a first transmission unit that transmits a measurement result of the radiation sensor and the position information, wherein the management device performs the measurement. A first receiving unit for receiving a result and the position information is included.

According to the above configuration, the management device can acquire the position information and the measurement result of the personal dosimeter, and can obtain the dose rate distribution using each personal dosimeter as a monitoring point.

Preferably, the management device includes a second transmitting unit that transmits a command, the personal dosimeter receives a second receiving unit that receives the command, and a command received by the second receiving unit in a synthesized voice. Output means for outputting. Preferably, the personal dosimeter further includes an imaging unit, and an image captured by the imaging unit is transmitted from the first transmission unit to the first reception unit. Preferably, the position detector is provided on a head of the worker.

Preferably, the personal dosimeter includes a dosimeter main body mounted on a worker's body and having the radiation sensor, and a head unit provided on the worker's helmet and having the position detector.

(5) In order to achieve the above object, the present invention relates to a personal dosimeter used in a radiation measurement system and transmitting information to a management device, wherein a radiation sensor and position information of the personal dosimeter are used. It is characterized by including a position detector for detecting, a transmission unit for transmitting the measurement result of the radiation sensor and the position information to the management device, and a reception unit for receiving an instruction from the management device.

Preferably, the apparatus further includes an imaging unit, and the measurement result, the position information, and the image captured by the imaging unit are transmitted to the management device.

As described above, according to the present invention, personal exposure management can be performed more appropriately. Alternatively, it is possible to appropriately manage individual exposure of a worker who does not have specialized knowledge. Alternatively, the commander can make an appropriate decision on the management device side.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a preferred embodiment of the radiation measurement system according to the present invention, and FIG. 1 is a conceptual diagram showing the entire configuration.

As shown in FIG. 1, the radiation measurement system according to the present embodiment includes a plurality of personal dosimeters 10 and a management device 16 that manages the personal dosimeters 10. Here, the management device 16 is installed in, for example, a central management room or a management center. Each personal dosimeter 10 is carried by a worker working in a radiation handling room or a worker such as a fire brigade. The personal dosimeter 10 is roughly divided in the present embodiment into a main body 14 and a head unit 12, which will be described later in detail. The management device 16 is configured by, for example, a computer system. The communication unit 18 is a unit for performing data communication with the personal dosimeter by wire transmission or wireless transmission, and the communication unit 18 has a transmission function and a reception function. In the present embodiment, the communication unit 18 has an antenna 19 for performing wireless communication.

The arithmetic processing unit 20 is configured by a CPU and a predetermined program, performs an arithmetic operation on various data obtained via the communication unit 18, and performs an operation on each personal dosimeter 10 via the communication unit 18 as necessary. Means for issuing a predetermined command. A storage unit 22 is connected to the arithmetic processing unit 20, and the storage unit 22 stores measurement results, image information, position information, and the like transmitted from the personal dosimeter 10.

The input unit 24 is configured by, for example, a keyboard, and the display unit 26 is configured by, for example, a display. The two-dimensional dose distribution may be displayed based on the position information and the dose information of each personal dosimeter 10.

FIG. 2 shows a specific example of the personal dosimeter 10 shown in FIG. As described above, the personal dosimeter 10 includes the main body 14 and the head unit 12. Here, the main body 14 is attached to, for example, a breast pocket of an operator, and has a slightly thick-shape like a conventional personal dosimeter. On the other hand, the head unit 12 is arranged on the worker's helmet in the present embodiment.

放射線 In the main body 14, the radiation sensor 30 is a semiconductor detector that detects radiation. The output signal from the radiation sensor 30 is amplified by an amplifier 34 and then input to a wave height discriminator 38. The wave height discriminator 38 is for passing only a radiation signal.

(4) The microcomputer 46 receives an output signal from each wave height discriminator 38. The microcomputer 46 has a dose rate calculation function and an integrated dose calculation function. In the figure, those functions appear as a dose rate calculator 48 and an integrated dose calculator 50. The microcomputer 46 has a function of determining a notification condition according to a notification condition table stored in the memory 60. A specific example of the notification condition table will be described later with reference to FIG.

The communication unit 52 is a means for performing wireless communication between the main body 14 and the head unit 12, and communicates with the management device 16 shown in FIG. Is established. Of course, communication may be established with the management device 16 via the head unit 12. An antenna 53 is connected to the communication unit 52.

ＬＣＤ The microcomputer 46 is connected to an LCD 54 as a liquid crystal display. The LCD 54 displays the integrated dose and the dose rate as necessary. Various display forms can be adopted.

The LED array 56 is connected to the microcomputer 46. In this embodiment, the LED array 56 includes three red, yellow, and green LED elements. The operation of these LED elements is controlled according to the height of the dose rate and the like as described later.

In the related art, the dose rate and the integrated dose are grasped by checking the display of the LCD 54 and the like. However, according to the present embodiment, a worker is placed by the light emission of the LED array 56 together with the output of a message described later. It is possible to easily understand the degree of danger of the situation.

A buzzer 58 is connected to the microcomputer 46. The buzzer 58 is driven when certain conditions are satisfied, as in a conventional dosimeter. In the present embodiment, in particular, the volume of the buzzer is switched. Although not shown, a vibrator is connected to the microcomputer 46. By vibrating the vibrator, it is possible to notify a worker of danger as physical vibration.

The memory 60 is configured by an EPROM or the like, and stores, in addition to the notification condition table described above, detected measured values as necessary. Incidentally, the main body 14 may be provided with a transducer for performing infrared communication with an external device.

In the head unit 12, the communication unit 64 is connected to the antenna 65 and establishes communication with the communication unit 52 of the main body 14 or the communication unit 18 of the management device 16. A microcomputer 66 is connected to the communication unit 64, and the operation of each component is controlled by the microcomputer 66. The voice synthesizing unit 68 is a means for electronically synthesizing the message shown in FIG. 3 later according to the notification condition output from the main body 14 and outputting the synthesized voice to the speaker 70. A plurality of messages are prepared in advance, and an appropriate message is selected from the messages according to the situation, and notification is performed by the message.

(4) A GPS 72 as a position information detector is connected to the microcomputer 66, and the GPS 72 can detect information on the geographical position of the personal dosimeter. The microcomputer 66 is connected to a CCD 74 as an image sensor, and an image captured by the CCD 74 is taken into the microcomputer 66.

The head unit 12 is provided with a battery 76 for driving each component, while the main body 14 is also provided with a battery 62. Of course, one of the batteries may also be used to supply power.

By the way, in the embodiment shown in FIG. 2, the voice synthesizing section 68 is provided in the head unit 12, but its function is provided in the main body 14, and a message is transmitted to the head unit 12 as a signal. The speaker 70 may be driven.

Alternatively, the function of the voice synthesizing unit may be provided in the management device 16 and a command may be given from the management device 16 to the head unit 12. That is, the management device 16 is provided with a function of a voice synthesis unit.

Further, in the present embodiment, the notification condition is determined in the main body 14 according to the notification condition table. However, the determination of the condition may be performed by the head unit 12 or by the management device 16. That is, you may make the management apparatus 16 determine a notification condition.

According to the configuration example shown in FIG. 2, the notification condition can be determined in the main body 14, and the notification means on the main body 14 and the speaker in the head unit 12 can be driven, so that there is an advantage that rational control can be performed. . In particular, according to the present embodiment, even when some communication failure occurs, there is an advantage that the situation can be reliably notified by using various notification means in combination.

Next, the notification conditions will be described with reference to FIG. The horizontal axis of the table shown in FIG. 3 is the integrated dose, which is divided into three sections of 0 to 20 mSv, 20 to 80 mSv, and 80 mSv or more. The vertical axis of the table shown in FIG. 3 corresponds to the dose rate, which is four or less of 0.1 mSv / h, 0.1 to 1 mSv / h, 1 mSv / h to 20 mSv / h, and 20 mSv / h or more. It is divided into categories. The notification condition is determined as shown in the figure according to the correspondence between these sections. This will be specifically described below.

{First, when the integrated dose is in the range of 0 to 20 mSv and the dose rate is 0.1 mSv / h or less, the message indicated by * 1 is output once every 10 minutes. Here, the message is "safe." Of course, such a message is just an example, and various other messages can be adopted. This is the same for other messages. Along with this message output, a green LED is turned on under the condition. The operator can clearly recognize that the current situation is within the safe range by the voice message and the LED display. In particular, since the situation can be directly perceived by the worker by the voice message, it is possible to avoid problems such as an incorrect display color and a loss of recognition of other information.

Next, when the dose rate is 0.1 to 1 mSv / h in the same range of the integrated dose as described above, the same * 1 message is output once every 10 minutes and the green LED is turned on. Is done. That is, the notification is executed under the same conditions as described above. On the other hand, when the dose rate is 1 mSv / h to 20 mSv / h in the same integrated dose range as described above, the * 2 message is output once every 60 seconds, and the yellow LED is turned on. That is, a message such as “There is a lot of radiation” is output. Here, the expression that there is a lot of radiation, not saying that the dose rate is high, is selected from terms that can be easily understood by non-experts as much as possible.

If the dose rate becomes 20 mSv / h or more at the same integrated dose as above, a * 3 message is output once every 40 seconds, the red LED is turned on, and the buzzer sounds at a lower volume. Is driven. Here, the message of * 3 has, for example, a content of "very much radiation".

On the other hand, when the integrated dose is 20 to 80 mSv, the following notification conditions are set.

First, in the case of 0.1 mSv / h or less, different notification conditions are set depending on whether the current dose rate is decreasing or increasing. If the dose rate is decreasing, the dose rate was high in the past, but it is determined that the dose rate is extremely low at present. Therefore, the message * 6 is output and the red LED blinks. , The buzzer is turned off. Here, the message of * 6 has, for example, a content of “safe area”. This is output, for example, once every 10 minutes. By the way, the reason why the red LED blinks is that the accumulated dose is considerably large, so that it is kept informed to the worker.

On the other hand, under the same conditions as above, if there is an increasing tendency, after the message of * 4 is output, for example, three times at a predetermined interval, the message of * 6 is output once every 10 minutes. Here, the message of * 4 is that "exposure amount has approached the limit value", and after this is output three times, the same message of "safe area" is periodically output. The red LED flashes and the buzzer is turned off. In other words, while recognizing that the exposure amount is large, the worker is notified that the worker is currently in the safe area.

If the dose rate is 0.1 to 1 mSv / h at the same integrated dose as above at 20 to 80 mSv, the message of * 4 is output once every 40 seconds, and the red LED blinks with this. The buzzer is driven at a low volume.

Also, under the same conditions as above, if the dose rate is 1 mSv / h to 20 mSv / h, * 4 and * 2 messages are output alternately every 20 seconds. That is, both the fact that the integrated dose is large and the dose rate is high are made to be recognized by the worker. At the same time, the red LED flashes, and the buzzer is driven at a low volume.

(4) Under the above conditions, if the dose rate is 20 mSv / h or more, * 4 and * 3 messages are output alternately every 20 seconds. Here, the red LED blinks as described above, and the buzzer is driven at a low volume.

Next, a case where the integrated dose is 80 mSv or more will be described. First, if the dose rate is decreasing at 0.1 mSv / h or less, a message of * 6 is notified once every 10 minutes, and with this, a red color is displayed. LED blinks, the buzzer is turned off, and the vibration of the vibrator is also turned off. On the other hand, if the dose rate is increasing, a message of * 5 is notified three times at a predetermined interval, and then a message of * 6 is notified once every 10 minutes. Here, the message of * 5 has a content of "retreat". At the same time, the buzzer is turned off and the vibration of the vibrator is also turned off.

On the other hand, when the dose rate is 0.1 to 1 mSv / h under the same integrated dose as above, a message of * 5 is notified once every 40 seconds, the red LED flashes, and the buzzer sounds. Driven at a loud volume. This notification condition is the same in the case of 1 mSv / h to 20 mSv / h and 20 mSv / h or more. However, the notification interval of the message of * 5 is switched between 20 seconds and 10 seconds, thereby exerting a psychological effect.

As described above, according to the present embodiment, it is possible to operate the appropriate notification means in accordance with the combination of the value of the integrated dose and the value of the dose rate. It is. In particular, according to the present embodiment, there is an advantage that multifaceted notification can be performed by combining one or more other notification means based on the output of a message based on speech synthesis. Therefore, the safety of the worker can be further improved.

Especially, since the content of the message is set so that it can be compared reliably within the allowable limit, it is possible to perform appropriate exposure management based on laws and regulations. Incidentally, in addition to the output of the message registered in advance as described above, a special message of the commander may be output from the management device 16, and the duty is forcibly abandoned even for those with a strong sense of justice. Evacuation can be encouraged. In this case, the commander has the advantage that the position information and image information in addition to the measurement results are collected, so that the judgment can be made appropriately. In addition, valuable information is collected even when performing later verification. There is an advantage that you can.

That is, if the measurement result, the position information, and the image information are transmitted from the personal dosimeter to the management device 16, there is an advantage that the commander can appropriately make the determination.

Next, FIG. 4 conceptually shows a configuration example of the head unit 12 shown in FIG.

In FIG. 4, the helmet 102 worn on the head of the worker is provided with a position detector 72 as GPS. As shown, the position detector 72 is provided especially on the top of the helmet 102. A battery 76 is mounted on a side portion of the helmet 102, and an antenna 65 is provided upright based on a case of the battery. At the center of the helmet 102, a CCD 74 as an image sensor is provided. On the other hand, an FPC 100 is built in the wall of the helmet 102, and an electronic circuit such as a microcomputer and a voice synthesis unit is mounted on the FPC 100. FPC is a flexible printed circuit board. A speaker 70 is provided on the side of the helmet 102 while being positioned at a position to the right of the worker. Of course, the configuration example shown in FIG. 4 is an example, and another configuration example can be adopted.

FIG. 1 is a conceptual diagram of a radiation measurement system according to the present invention. It is a block diagram of a personal dosimeter according to the present invention. It is a figure showing an example of a notice condition table. It is a figure showing the example of composition of a head unit.

Explanation of reference numerals

{10} personal dosimeter, 12} head unit, 14} body, 16} management device.

Claims (7)

A personal dosimeter carried by a worker, and a management device that manages the personal dosimeter, a system including:
The personal dosimeter,
A radiation sensor;
A position detector for detecting position information of the personal dosimeter;
A first transmission unit that transmits the measurement result of the radiation sensor and the position information,
Including
The radiation measurement system, wherein the management device includes a first receiving unit that receives the measurement result and the position information. The system according to claim 1,
The management device includes a second transmission unit that transmits a command,
The radiation measurement system according to claim 1, wherein the personal dosimeter includes a second receiving unit that receives the command, and a notification unit that outputs the command received by the second receiving unit as a synthesized voice. The system according to claim 1,
The personal dosimeter includes an imaging unit,
An image captured by the imaging unit is transmitted from the first transmission unit to the first reception unit. The system according to claim 1,
The said position detector was provided in the head of the said worker, The radiation measurement system characterized by the above-mentioned. The system according to claim 1,
The personal dosimeter,
A dosimeter body attached to the worker's body and having the radiation sensor,
A head unit provided on the worker's helmet and having the position detector;
A radiation measurement system comprising: A personal dosimeter that is used in a radiation measurement system and transmits information to a management device,
A radiation sensor;
A position detector for detecting position information of the personal dosimeter;
A transmission unit that transmits the measurement result and the position information of the radiation sensor to the management device,
A receiving unit that receives an instruction from the management device;
A personal dosimeter characterized by including: The personal dosimeter according to claim 6,
It further has an imaging unit,
The personal dosimeter, wherein the measurement result, the position information, and an image captured by the imaging unit are transmitted to the management device.

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