JP3437500B2 - Portable dose measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radiation dose measuring apparatus used for personal monitoring in nuclear facilities.

[0002]

2. Description of the Related Art In nuclear facilities, in order to prevent radiation hazards and hazards, environmental monitoring inside the facility, individual monitoring for individual workers in the controlled area, environmental monitoring outside the facility, etc. Is required to carry out various types of monitoring. Among these, individual monitoring is performed for the purpose of measuring and recording the radiation dose of each worker and managing it so that the radiation dose does not exceed the maximum allowable dose.
Then, by analyzing the exposure dose obtained by this individual monitoring, it is also judged whether or not the management of the work environment is sufficient.

In the conventional personal monitoring, an operator entering a controlled area carries a dose measuring instrument called a pocket dosimeter or a pocket chamber, and the worker himself / herself checks the accumulated exposed dose in the controlled area. At the same time, the radiation dose meter is collected from the workers who have left the controlled area, and the recorded radiation dose data is analyzed.

The place where an operator carries such an exposure dose measuring device is usually a place where the effect of radiation exposure is not negligible and does not cause much trouble in performing work. Around the possible chest. Then, the worker inserts the radiation dose measuring instrument into the chest pocket, or attaches the radiation dose measuring instrument to a string and hangs it around the neck to attach the dose measuring instrument to the vicinity of the chest. Was doing.

[0007] Incidentally, the portable radiation dose measuring instruments such as pocket dosimeters and pocket chambers which are generally used at present are to pick up all incident electromagnetic waves and convert them into energy, and to pick up only radiation. It does not convert this into energy. Therefore, the measured value of the radiation dose data measured by the radiation dose meter is the process of controlling the electromagnetic valve and motor brake, etc., in addition to the electromagnetic waves (radiation) emitted from the nuclear fuel etc. which is the original measurement target. Since it also includes the part of the electromagnetic wave emitted by
Not a very accurate measurement. However, this measured value shows a value larger than the actual exposure dose, and this is a so-called "safe side" measured value, so there is no practical problem even if it is not an accurate measured value. .

[0006]

However, in the above-mentioned conventional personal monitoring, it is premised that the worker himself / herself checks the exposure dose measuring device.
Workers who entered the controlled area neglected to check the radiation dose meter for too long time to concentrate on the work,
As a result, there is a risk of exposure to dangerous levels of radiation.

The present invention has been made in view of the above circumstances, and it is possible to reliably prevent an accident in which a worker who enters a controlled area is exposed to a dangerous level of radiation, and a portable radiation dose measuring apparatus. Is intended to provide.

[0008]

As a means for solving the above-mentioned problems, the invention according to claim 1 is mounted on an operator in a controlled area to display the detected exposure dose and to detect this exposure dose. When the radiation dose meter that outputs the dose data wirelessly or by wire and the data of the detected radiation dose, which is attached to the worker and output by the radiation dose meter, is received, and this data exceeds a predetermined level Equipped with headphones that output a warning message by voice ,
The headphones are used for the rate of change of the detected radiation dose data.
The output frequency of the warning message can be changed accordingly.
There is a feature.

According to a second aspect of the present invention, in the first aspect of the present invention, the exposure dose measuring device is different from a headphone of another exposure dose measuring device attached to another worker in the controlled area. However, the output of predetermined identification number data together with the data of the detected exposure dose is performed wirelessly, and the headphones receive only the data of the detected exposure dose related to the preset identification number data. There is a feature.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the exposure dose measuring device is installed in the control area and is connected to a central monitoring device via a transmission line. The device is also characterized in that a predetermined identification number data is output wirelessly together with the detected radiation dose data.

[0011]

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, there is provided a display panel which is worn by the worker and which changes a color when the headphones output an alarm message, It is characterized by having.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the headphone selects any one alarm message from a plurality of preset alarm messages according to the detected exposure dose data. The display panel is a liquid crystal panel in which a voltage applied to liquid crystal molecules is changed according to selection of an alarm message from the headphones.

The invention according to claim 6 is the invention according to claim 4 or 5 , characterized in that the display panel is attached to a helmet worn by the worker.

[0015]

1 is a block diagram of an embodiment of the present invention. In this figure, the radiation dose measuring device Pm is
The exposure dose measuring instrument 1, a headphone 2, and a display panel 3 are included. Although the radiation dose measuring instrument 1 is assumed to be a pocket chamber in this embodiment, it may be a pocket dosimeter. This radiation dose measuring instrument 1 is a conventional one with a data transmission function added, and is mounted near the chest of an operator as in the conventional case. The headphone 2 outputs a voice warning message to the worker based on the data transmitted from the radiation dose measuring instrument 1, and is attached to a helmet worn by the worker. The display panel 3 changes the color when the headphone 2 outputs an alarm message, and calls attention of not the worker who is the target of the alarm but the other workers around this worker. In this embodiment, a liquid crystal film attached to the helmet surface is used as the display panel 3.

The radiation dose measuring instrument 1 comprises a radiation dose detecting section 4,
Data processing unit 5, data display unit 6, and data transmission unit 7
have. The radiation dose detection unit 4 detects incident radiation and outputs a signal indicating the cumulative value thereof to the data processing unit 5. The data processing unit 5 performs data processing on this signal and converts it into a digital value. The signal is output to the data display unit 6 and the data transmission unit 7. The data display unit 6 displays the digital value of the detected radiation dose in seven segments based on the signal input from the data processing unit 5. The data transmitter 7 wirelessly outputs the signal input from the data processor 5, but also outputs a predetermined identification number (ID number) at the same time, and this wireless output is used as the radiation dose measuring device Pm. The receiving side can determine that it is related to.

The headphone 2 has a data receiving section 8, a data processing section 9, and an audio output section 10. The data receiving unit 8 receives the wireless signal about the identification number and the detected radiation dose output from the data transmitting unit 7, and determines that this wireless signal is related to itself, that is, related to the radiation dose measuring device Pm. After that, a signal regarding the detected exposure dose is output to the data processing unit 9.
The data processing unit 9 performs data processing of the input signal regarding the detected exposure dose, and outputs a voice output command signal to the voice output unit 10 when the detected exposure dose exceeds a predetermined set level.

The above-mentioned set levels set in the data processing unit 9 are plural, and when the detected exposure dose changes and these plural set levels are passed, the data processing unit 9 outputs different voices at each passing. The output command is output to the voice output unit 10. Then, a plurality of alarm messages are preset in the voice output unit 10 according to each set level, that is, in accordance with the detected exposure dose data,
The voice output unit 10 selects any one of the warning messages based on the instruction from the data processing unit 9 and outputs the selected voice message to the operator by voice. For example, in the process of gradually increasing the detected dose, when the initial set level is exceeded, an alarm message is issued to alert the operator, and the detected dose is further increased and exceeds the mid-term set level. Occasionally, a warning message is issued to the effect that the situation is becoming more serious, and when the final set level is exceeded, a warning message is ordered to immediately leave the area and evacuate.

The data processing unit 9 also calculates the rate of change of the detected radiation dose for each predetermined time, and adjusts the number of voice output commands to be output to the voice output unit 10 according to the rate of change. Thus, the output frequency of the alarm message of the voice output unit 10 can be changed. For example, when the detected radiation dose is rapidly increasing, the audio output unit 1
0 outputs the warning message frequently, and does not output the warning message so frequently when the increase is moderate.

As described above, the liquid crystal film attached to the helmet surface is used for the display panel 3, and the display panel 3 has a voltage control unit for varying the voltage applied to the liquid crystal molecules. Have 11. The value of the maximum detected exposure dose assumed in the controlled area is preset as a set value α in the voltage control unit 11, and the maximum applied voltage of the voltage control unit 11 is the voltage corresponding to the set value α. Has become. Then, the voltage control unit 11 inputs the value of the set level when the data processing unit 9 outputs the sound output command to the sound output unit 10, and calculates the ratio between the set level value and the set value α. A voltage multiplied by the maximum applied voltage is applied to liquid crystal molecules. This allows
The voltage applied to the liquid crystal molecules changes stepwise, and the inclination of the liquid crystal molecules changes according to the applied voltage, so that the color displayed on the display panel 3 changes stepwise due to the polarization effect. .

A certain worker in the controlled area wears the radiation dose measuring device Pm having the above-mentioned structure, but a plurality of workers in the controlled area also use this radiation dose measuring device Pm. Dose measurement devices P1 to P having the same configuration as
It is designed to be attached to each n. Then, the transmission data emitted from the data transmitting unit 7 of the radiation dose measuring apparatus Pm is received by the data receiving unit 8 of its own, and is also received by the data receiving units of these other radiation dose measuring apparatuses P1 to Pn. It is like this.

Although it has been described that the radiation dose measuring device Pm is composed of the radiation dose measuring device 1, the headphones 2 and the display panel 3, in reality, a battery (Fig. (Not shown) is provided,
In the present embodiment, this battery is assumed to be provided in association with the radiation dose measuring instrument 1.

Further, a relay terminal 12 connected to a central monitoring device (host computer) 13 in the central control room via a transmission line 14 is installed at a predetermined location in the controlled area, and a radiation dose measuring device is provided. The transmission data transmitted from the Pm data transmission unit 7 is also received by the relay terminal device 12.

Next, the operation of the radiation dose measuring apparatus Pm configured as described above will be described. A worker in the controlled area (hereinafter referred to as worker Mm) wears the radiation dose measuring device Pm, and a plurality of other workers in the controlled area (hereinafter referred to as workers M1 to Mn). The radiation dose measuring devices P1 to Pn are mounted respectively.

The radiation dose detector 4 detects the incident radiation and outputs a signal indicating the cumulative value to the data processor 5. The data processing unit 5 outputs a signal obtained by data-processing this signal and converting it into a digital value to the data display unit 6 and the data transmission unit 7. The data display unit 6 displays the digital value of the detected radiation dose in seven segments based on the signal input from the data processing unit 5. The worker Mm can confirm the display of the data display unit 6 at any time during the work.

The data transmission unit 7 transmits and outputs the data of the detected exposure dose from the data processing unit 5 together with the identification number of the worker Mm. Here, the data receiving unit 8 of the headphones 2
An identification number for data to be received is set in advance. In this case, the data received by the data receiving unit 8 is the data with the identification number of the worker Mm and the data with the identification numbers of the other workers M1 to Mn. Similarly, the radiation dose measuring devices P1 to P1 on the side of other workers M1 to Mn
Each data receiving unit of Pn also receives the data with its own identification number and the data with the identification numbers of other workers including the worker Mm. In addition, the relay terminal 1
2 also has a similar data receiving section, and this receiving section
The data with the identification numbers of all the workers Mm and M1 to Mn in the management area is received.

Therefore, the data receiving unit 8 receives from the data transmitting unit 7 the detected exposure dose data to which the identification number of the worker Mm is added, and the exposure dose measuring devices P1 to Pn.
Receives the detected radiation dose data to which the identification numbers of the workers M1 to Mn are attached. The data processing unit 9 constantly determines whether or not the received detected exposure dose exceeds the above-mentioned set level.

Now, assuming that the detected radiation dose data with the identification number of the worker Mm exceeds the initial setting level,
The data processing unit 9 outputs a voice output command to the voice output unit 10, and the voice output unit 10 voice-outputs a warning message that calls attention to the worker Mm based on this. At this time,
On the display panel 3 side, the voltage control unit 11 applies a voltage obtained by multiplying the maximum applied voltage by the ratio of the initial set level and the set value α to the liquid crystal molecules, whereby the display panel 3 provided on the helmet of the worker Mm is For example, a yellow color is displayed. Then, assuming that the detected exposure dose data is rapidly increasing, the voice output unit 10 frequently repeats the output of the above warning message in a predetermined cycle.

Thereafter, if the value of the detected exposure dose data continues to increase and exceeds the mid-term set level, the voice output unit 10
Outputs an alarm message indicating that a more serious situation is occurring, and the color of the display panel 3 changes to, for example, orange. Then, if the value of the detected exposure dose further increases and exceeds the final set level, the voice output unit 10 immediately outputs a warning message to the effect that the user should leave the place and evacuate, and the color of the display panel 3 changes to, for example, red. To do.

On the other hand, the radiation dose measuring devices P1 to Pn of the workers M1 to Mn also receive the detected radiation dose data transmitted from the data transmitting unit 7 of the radiation dose measuring device Pm. However, the voice output unit on the side of the radiation dose measuring devices P1 to Pn does not yet output an alarm message when the detected radiation dose data of the worker Mm exceeds the initial setting level, and the level exceeds the mid-term setting level. For the first time, an alarm message indicating that the worker Mm is exposed to a dangerous state is output.
This means that it is appropriate to leave the response at the initial stage to the judgment of the worker Mm himself. Furthermore, if the warning message about the stranger at the initial stage was output by voice each time, the worker M1 ... This is because the work of Mn may be hindered.

Further, the relay terminal device 12 also receives the detected exposure dose data emitted from the data transmission unit 7 of the exposure dose measuring device Pm, and sends this data to the central monitoring device 13 via the electric transmission line 14. . The central monitoring device 13 constantly monitors whether the value of the detected exposure dose data is within an appropriate range. If the detected radiation dose data sent from the radiation dose measuring device Pm continues to increase even after exceeding the final set level, it is considered that some serious accident has occurred. Issue an emergency alarm. As a result, investigators are immediately dispatched from the central management office to understand the situation at the site.

After the worker Mm and the workers M1 to Mn have come out of the controlled area, the exposure dose measuring device Pm and the exposure dose measuring devices P1 to Pn are all collected and the content of each detected exposure dose data is analyzed. However, it is conceivable that some workers may leave the radiation dose measurement device in the controlled area. In such a case, even if the radiation dose measurement device is subsequently collected, it is considered that the value of the detected radiation dose is increasing during that time, and therefore it is no longer possible to obtain an accurate detected radiation dose. It also becomes impossible to obtain the total detected radiation dose for all. However, in such a case, it is possible to substitute the reference exposure dose data set in advance as the exposure dose data detected by the exposure dose measuring device that has been left behind.

According to the above-mentioned portable type radiation dose measuring apparatus, it is possible to effectively prevent the occurrence of radiation exposure accidents for workers. That is, even if the worker Mm neglects to check the digital value of the data display unit 6 of the exposure dose measuring device 1 for a long time because the worker Mm concentrates on work, if the detected exposure dose increases by a certain amount or more, the sound output of the headphones 2 is output. Since the warning message is issued from the section 10, the worker Mm can take appropriate measures. At this time, even if the worker Mm misses this warning message due to ambient noise, the other workers M1 to Mn also hear this warning message (the detected radiation dose exceeds the mid-term set level). At the same time, it should be noticed that the color of the display panel 3 of the helmet worn by the worker Mm has changed,
A worker near the worker Mm among the workers M1 to Mn can directly call attention to the worker Mm.

As described above, the worker Mm and the workers M1 to Mn wearing the radiation dose measuring apparatus according to the present invention can reliably monitor their own safety, and further check their own safety by others. You can monitor the safety of others as well as ask. That is, the safety of each worker is basically checked by his / her own attention, but since it is also checked by other workers, the occurrence of radiation exposure accidents can be greatly reduced.

The structure of the present invention broadly includes the following modes in addition to the modes described above.

(1) In the configuration shown in FIG. 1, all the transmission data from the data transmitting section 7 is transmitted wirelessly, but only the data receiving section 8 in its own device is transmitted by wire. It may be configured to.

(2) In the above embodiment, since the battery is provided in association with the exposure dose measuring instrument 1, the exposure dose measuring instrument 1 has the data transmitter 7 and the battery added in comparison with the conventional one. The weight and volume are increased by the amount of the increase. Therefore, when the worker wears the radiation dose measuring instrument 1, it is preferable to use a special fixing band or the like so that the radiation dose detecting unit 4 is located near the chest of the worker. Conventionally, an operator may attach a string to the radiation dose measuring device and wear the string by hanging it from the neck, but such wearing hinders work in high places or narrow places. As a result, it may lead to unsafe acts. If the radiation dose measuring instrument 1 is attached by the above-mentioned special fixed band, it is possible to eliminate the risk of non-safe acts.

(3) The voice output section 10 of the headphones 2 is
As the detected exposure dose increases from the initial setting level to the mid-term setting level, and further to the final setting level, it is possible to set to increase the volume when outputting the alarm message by voice. According to this, an operator's attention can be called more certainly.

(4) In the above embodiment, the radiation dose measuring apparatus Pm has both the headphones 2 and the display panel 3, but the display panel 3 is omitted in consideration of various conditions. May be This also
It is possible to effectively prevent the occurrence of radiation exposure accidents.

(5) In the above embodiment, the display panel 3 is a liquid crystal film (liquid crystal panel) attached to the helmet surface of the worker. However, as long as the danger of the worker can be displayed in colors. Other materials can be used. Further, the mounting position of the display panel 3 is not limited to the helmet, but it may be mounted on the back of the worker by a special fixing tool, for example.
Furthermore, in the above-described embodiment, the display panel 3 is configured to change only the color, but it may be configured to change the color and blink. According to this
Other workers can quickly detect this worker's danger.

(6) In the above embodiment, it is assumed that the radiation dose measuring instrument 1 is a pocket chamber (ionization chamber), but the radiation dose measuring instrument 1 is not limited to this, and other types such as a pocket dosimeter can be used. An exposure dosimeter can be used.

[0042]

As described above, according to the present invention, an exposure dose measuring device for outputting the data of the detected exposure dose wirelessly or by wire and a voice when the detected exposure dose data exceeds a predetermined level Since the headphone for outputting an alarm message according to the above is provided, it is possible to reliably prevent an accident in which a worker who enters the controlled area is exposed to a dangerous level of radiation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

Pm Dose measurement device worn by a worker P1 to Pn Dose measurement device worn by other workers 1 Radiation dose meter 2 headphones 3 display panel 4 Exposure dose detector 5 Data processing unit 6 Data display section 7 Data transmitter 8 Data receiver 9 Data processing unit 10 Audio output section 11 Voltage control unit 12 Relay terminal 13 Central monitoring device 14 transmission lines

Claims (6)

(57) [Claims] 1. A radiation dose measuring instrument which is attached to an operator in a controlled area to display the detected radiation dose and output the data of the detected radiation dose wirelessly or by wire, and to the worker. And a headphone for receiving the data of the detected radiation dose output from the radiation dose measuring device and outputting a warning message by voice when this data exceeds a predetermined level, and the headphone is provided with the detected radiation dose. Rate of change in data
That changes the output frequency of the warning message according to
The portable radiation dose measuring device characterized in that 2. The exposure dose measuring device is provided with a predetermined identification number together with the data of the detected exposure dose for headphones of another exposure dose measuring device worn by another worker in the controlled area. The portable type according to claim 1, wherein the output of data is performed wirelessly, and the headphone receives only the data of the detected exposure dose related to the preset identification number data. Radiation dose measurement device. 3. The exposure dose measuring device is also provided with a predetermined identification together with the data of the detected exposure dose even for a relay terminal device installed in the control area and connected to a central monitoring device via a transmission line. The portable radiation exposure dose measuring apparatus according to claim 1 or 2, wherein the output of the number data is performed wirelessly. 4. A is attached to the worker, portable described a display panel to change the color, any one of claims 1 to 3, characterized in that in case where the headphone outputs an alarm message Radiation dose measurement device. 5. The headphone selects and outputs one of a plurality of preset warning messages according to the data of the detected exposure dose, and the display panel displays the headphones. The portable radiation dose measuring device according to claim 4 , wherein the liquid crystal panel is a liquid crystal panel in which a voltage applied to liquid crystal molecules is changed according to selection of the alarm message. 6. The portable radiation dose measuring apparatus according to claim 4 , wherein the display panel is attached to a helmet worn by the worker.