JP2013061203A - Radiation dose monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable measurement of radiation to be performed for long term in outdoor places without external power supply, especially for personal radiation exposure management.SOLUTION: A radiation dose monitoring system comprises: a measurement device 14 and a monitoring device 12 as outdoor devices. The devices are connected by wireless. The measurement device 14 comprises a hollow case 40, and in the hollow case, an exchange unit 38 as an exchanger is provided. The exchange unit 38 comprises a radiation measurement unit and a wireless communication unit, and the units comprise individual batteries. For transferring data between the monitoring device 12 and the measurement device 14, sequences are set in order to consume less battery in the measurement device 14.

Description

  The present invention relates to a dose monitoring system, and more particularly to a dose monitoring system that measures a dose with a radiation measurement apparatus installed outdoors and monitors the measurement data at another place.

  Exposure management is required not only for workers who work in radioactive material handling facilities but also for ordinary people. There is a particular need for exposure management for children who have many opportunities to be outdoors. Electronic personal dosimeters are used for personal exposure management. This is to estimate the exposure amount of a person by detecting radiation by being worn on clothing or the like. The measured data is displayed in units such as accumulated dose equivalent (μSv) and dose equivalent rate (μSv / h). Some radiation measuring devices display the accumulated dose or dose rate.

  In personal exposure management, of course, it is desirable to have electronic personal dosimeters spread to each subject. However, it may not be practical to have a very large number of personal dosimeters. Therefore, it is conceivable to measure the accumulated dose equivalent or dose equivalent rate representatively at a predetermined outdoor position and use it as a reference value in the exposure management of each person. According to such a configuration, for example, when the measured value rises, an appropriate countermeasure such as indoor retreat can be quickly taken. Alternatively, even if each person has a personal dosimeter, the safety can be further improved by measuring the exposure dose separately.

  Patent Document 1 discloses a system including a personal dosimeter and a management device that receives data from the dosimeter. However, there is no disclosure of a configuration that is fixedly installed outdoors and that measures radiation over a long period of time.

JP 2004-117372 A

  An object of the present invention is to provide a system capable of measuring radiation for a long period of time outdoors without an external power supply, particularly for personal exposure management.

  Another object of the present invention is to provide a system capable of continuously monitoring outdoor measurement results at a different location.

  The system according to the present invention includes a measurement device installed outdoors while being separated from the ground, and a monitoring device connected to the measurement device by wireless communication, and the measurement device is a hollow having a sealing property. A case, a radiation measurement unit that is provided in the hollow case and measures radiation coming from the outside, and is provided in the hollow case and intermittently transmits measurement data of the radiation measurement unit to the monitoring device A monitoring-side wireless communication unit that receives measurement data transmitted from the measuring device, and dose information based on measurement data from the processing-side wireless communication unit. And a display means for displaying the dose information, and an exchange body having at least the radiation measurement unit is provided in the hollow case so as to be replaceable. May exchange the exchanger to the other exchangers in the replacement time by, those.

  According to the said structure, a measuring apparatus is installed in the predetermined outdoor location, and a monitoring apparatus is provided in the place different from it. Since signals are exchanged between the two by wireless communication, there is no need to connect a cable between the measuring device and the monitoring device. If a battery is built in the measuring device, there is no need to install a power line for the measuring device. Therefore, the degree of freedom of installation of the measuring device can be increased. The measuring device is fixedly installed at a predetermined height (for example, a height of 1 m from the ground) from the viewpoint of personal exposure management. It is desirable to make the structure strong against wind and rain. A radiation measurement unit and a measurement-side wireless communication unit are provided in the hollow case. The antenna may be taken out of the hollow case, but may be accommodated in the hollow case as long as the hollow case has radio wave transmission. The monitoring device is provided with calculation means and display means. It may be constituted by a general purpose computer. The displayed dose information is, for example, an integrated dose equivalent, a dose equivalent rate, or the like. An accumulated dose, a dose rate, etc. may be displayed. An exchange body having at least a radiation measuring unit is accommodated in the hollow case. The exchange constitutes an exchange unit, and the exchange can be exchanged with another exchange having the same configuration as necessary. For example, it is desirable that such replacement is performed during calibration or when the battery is charged (when the battery is replaced). Since it is necessary to periodically calibrate the radiation sensor or the radiation measurement apparatus, an exchange unit called an exchange body is configured based on such a request. Radiation measurement, that is, exposure management can be continued using another exchanger after replacement. At that time, the accumulated dose equivalent and other data may be taken over. According to the configuration for exchanging the exchanger, the hollow case can be installed as it is, so that the amount of exchange can be reduced. The measurement-side wireless communication unit may be a part of the exchange body or may be a non-exchange object. From the viewpoint of a long-term outdoor installation, it is desirable to include the measurement-side wireless communication unit as a part of the exchange body and perform maintenance (operation check, etc.) of the measurement-side wireless communication unit during calibration of the radiation measurement unit. For example, the replacement period is 6 months, 1 year, or the like.

  Preferably, the exchange unit includes the battery unit, and the radiation measurement unit and the measurement-side wireless communication unit are supplied with electric power from the battery unit. If a battery unit is provided in the measuring apparatus, it is not necessary to secure an external power supply line, so that the degree of freedom in installing the measuring apparatus is dramatically increased. It is desirable that the monitoring device as the wireless communication destination is installed in a place where an external power source is secured. Of course, the monitoring apparatus side may be configured as a battery. By exchanging the exchange body, the removed radiation measurement unit can be calibrated, and at the same time, the removed battery can be charged. The battery may be replaced for other reasons such as exhaustion. Since a group of exchanges is configured, the measuring device to be configured and the battery to be charged can be removed together in one operation (operator's business trip), and at the same time, they can be collected. It is efficient because it can be done.

  Preferably, the battery unit includes a first battery and a second battery which are independent of each other, the power from the first battery is supplied to the radiation measurement unit, and the second battery is supplied to the measurement-side wireless communication unit. The power from is supplied. According to this, since the two devices are electrically separated from each other in terms of the power source, it is possible to avoid the influence of power source instability on the radiation measurement even if the power consumption suddenly increases during wireless communication. In addition, problems such as electromagnetic noise wraparound through the power supply line to the radiation measurement unit can be avoided. Such a configuration of the individual battery arrangement is also useful in other devices driven by a battery, in particular, other devices having a wireless communication unit.

  Preferably, a signal is transmitted by optical communication between the radiation measurement unit and the measurement-side wireless communication unit. According to this configuration, in combination with the separation of power sources, the electrical connection relationship between the radiation measurement unit and the wireless communication unit is cut off, and electromagnetic noise is prevented from wrapping around, thereby providing a good radiation measurement environment. Can be built.

  Preferably, the hollow case is made of a resin material, the exchanger has an electromagnetic noise shielding case containing at least the radiation measuring unit, and the electromagnetic noise shielding case is detachably attached to the hollow case. An antenna connected to the measurement-side communication unit is disposed between the hollow case and the electromagnetic noise shielding case. According to this configuration, the antenna can be protected. The resin case has radio wave transmission properties, and it is desirable that the resin case be made of a non-conductive member. In addition, it is desirable that the exchanger is composed of a metal case and an internal configuration (electronic circuit or the like).

  Preferably, the measurement-side communication unit intermittently transmits an inquiry signal, and transmits the measurement data when receiving a request signal from the monitoring-side wireless communication unit. When the elapsed time from the acquisition of the measurement data reaches a predetermined time and the inquiry signal is received, the request signal is transmitted to the measurement-side wireless communication unit. Preferably, the monitoring communication unit varies the predetermined time according to a dose rate.

  The power consumption is relatively large during data transmission, but the power consumption is small if only the inquiry signal is generated. Therefore, even if the inquiry signal is repeatedly transmitted from the measuring apparatus side at a relatively short time interval, the power consumption is not so much. The monitoring device issues a data request in response to the inquiry signal at the timing when the data is required. Therefore, although it is not possible to request data at any point in time within the short time interval, it is possible to issue a data request from the monitoring device when an inquiry signal is generated. As a result, the two requirements of reducing the power consumption on the measuring device side and requesting data at the necessary timing are satisfied.

  If a data request is issued voluntarily from the monitoring device side, it is unclear when the data request will be issued, so that the measurement device side needs to be kept in a standby state (cannot be put into a sleep state). According to the above configuration, it is possible to receive data in the monitoring device at any timing determined by the time interval while securing the sleep state time on the radiation measuring device side. In addition, if the predetermined time is switched according to the dose, for example, in the case of a low dose, the data request issuance interval is lengthened to reduce power consumption, and in the case of a high dose, the data request interval is shortened to improve real-time characteristics. Can be prioritized.

  Preferably, when there is a forced reception instruction from the user, the monitoring-side wireless communication unit transmits the request signal even before the elapsed time from the previous measurement data acquisition reaches a predetermined time. . For example, in a state where the monitoring device issues a data request at one hour intervals, if there is a case where it is desired to obtain dose information at the present time for some reason, a forced reception instruction may be issued.

  Preferably, the dose information is dose equivalent rate information calculated based on the latest measurement data currently possessed by the monitoring device, and time information indicating the time when the latest measurement data is acquired together with the dose equivalent rate information Is also displayed. If time information is also displayed, it is possible to prevent time misidentification when observing dose information.

  According to the present invention, it is possible to measure radiation for a long period of time outdoors, particularly for personal exposure management. In addition, outdoor measurement results can be continuously monitored at a different location.

1 is a block diagram showing a preferred embodiment of a dose monitoring system according to the present invention. It is a schematic diagram which shows the example of installation of the dose monitoring system shown in FIG. It is a block diagram which shows the structure of the measuring apparatus shown in FIG. It is a figure which shows the communication sequence between a monitoring apparatus and a measuring apparatus. It is a figure which shows the example of a display.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG. 1 shows a preferred embodiment of a dose monitoring system according to the present invention, and FIG. 1 is a block diagram showing the overall configuration thereof. The dose monitoring system 10 is installed in facilities such as an elementary school and a junior high school, for example. The dose monitoring system 30 is provided for managing the exposure of children in such a facility. However, this dose monitoring system can be used for various other uses that require exposure management for each person outdoors.

  The dose monitoring system 10 shown in FIG. 1 is roughly composed of a monitoring device 12 and a measuring device 14. The monitoring device 12 is constituted by, for example, a personal computer. The measuring device 14 is installed outdoors, and is configured as a device that is driven by a battery and does not require an external power source in the present embodiment. The measurement device 14 detects γ-rays as radiation in the present embodiment, and is a device that measures dose information such as dose equivalent and dose equivalent rate from the viewpoint of personal exposure management. The principal part of the measuring device 14 may be substantially constituted by a personal dosimeter.

  The measuring device 14 is fixedly installed at a predetermined height (a height of 1 meter) from the ground, as will be described later. In that case, the directivity direction of the radiation sensor is adjusted to a direction in which radiation contamination becomes more problematic. The pointing direction is usually the horizontal direction.

  Signals are exchanged between the measuring device 14 and the monitoring device 12 by wireless communication. This is represented by reference numeral 16. In the present embodiment, measurement data is intermittently sent from the measurement device 14 to the monitoring device 12.

  In this embodiment, the monitoring device 12 is supplied with electric power from an external power supply, but it may be driven by a battery. The monitoring device 12 has a processor 18. The processor 18 has a data calculation function, a communication function, and the like. A control function for the measuring device 14 is also provided. When the measurement data is sent from the measurement device 14, the processor 18 calculates data for exposure management such as an integrated dose equivalent and a dose equivalent rate based on the measurement data. Such a calculation result is output to the display unit 22. The display unit 22 and the input unit 20 may be configured by a touch screen in combination. Of course, the input unit 20 may be configured by a device such as a keyboard. The speaker 24 is a means for notifying the sound as a sound when dose information increases to a predetermined alarm level. The processor 18 executes predetermined control in accordance with the calculated dose information level. This will be described later. Incidentally, a wireless communication unit is provided on the measuring device 14 side, and similarly, a wireless communication unit is also provided on the monitoring device 12 side. Various wireless communication methods can be used. In this embodiment, wireless communication using a frequency of 2.4 GHz is performed.

  In the configuration example shown in FIG. 1, the monitoring device 12 is connected to a network 26 such as the Internet. A management center 28 is further connected on the network 26. Further, other dose monitoring systems 30 and 32 are connected to the network 26. The management center 28 acquires dose information calculated by the dose monitoring systems 10, 30 and 32 via the network 26, thereby performing wide area exposure management. In addition, when an abnormal value is detected in a specific dose monitoring system, the detection results of other dose monitoring systems are compared to check whether each individual dose monitoring system is operating properly. Is also going. Of course, the dose management system 10 can be used alone.

  FIG. 2 shows an installation example of the dose monitoring system. In the illustrated example, a school is shown.

  For example, the front side of the school building 34 is a school yard 36, and the child exercises and plays in the school yard 36. The school yard 36 is provided with a pole 37 for displaying a national flag and the like. In the present embodiment, the measuring device 14 is fixedly installed outdoors using the pole 37 which is such a workpiece. The measuring device 14 has a hollow case 40 that is fixed to the pole 37 by a member such as a metal fitting. The hollow case 40 includes a case main body and a cover, and the cover can be opened and closed with respect to the hollow case. The cover is provided with a lock mechanism as necessary. In the present embodiment, the hollow case 40 is made of resin, and an exchange unit 38 serving as an exchange body described below is provided therein. The exchange unit 38 accommodates a radiation measuring unit and a wireless communication unit, which will be described later. A battery unit is accommodated in the interior. In the radiation measurement unit, γ rays 15 flying from the surroundings are measured.

  On the other hand, the monitoring device 12 is installed indoors such as a staff room. It is desirable that the monitoring device 12 be installed near the window so that radio waves can easily reach. The distance between the measuring device 14 and the monitoring device 12 is preferably several tens of meters, for example. Of course, it is also possible to install a relay station or the like on the way if necessary. It is desirable to individually carry a dosimeter for each child who is exercising or playing outdoors. If this is not practical, the measuring device can be installed in the manner shown in FIG. 14 is preferably used to monitor the exposure dose. If such measurement results are obtained, it is possible to estimate and calculate the approximate dose in each child, and even if it is difficult to estimate the exact dose, it is possible to obtain a guideline for the dose. Benefits are gained.

  Incidentally, the radiation measuring unit has a radiation sensor, and the main sensitivity direction thereof faces the opposite side of the school building 34, that is, the school yard 36 in the present embodiment, which is the horizontal direction. This applies the same conditions as when measuring the individual exposure dose. Therefore, the height of the sensor is preferably 1 meter from the ground. Incidentally, since a metal member described later and a resin member constituting the hollow case 40 will be provided on the front surface of the sensor, it is necessary to perform calibration in advance so that the exposure dose is calculated in consideration of them. desirable.

  FIG. 3 shows specific contents of the measuring apparatus 14 shown in FIGS. 1 and 2. As described above, the hollow case 40 has a box shape, which is made of resin. It is desirable to use a case that is sealed so that rain does not enter at least, and it is desirable to use a material that allows radio waves to easily pass inside and outside. An exchange unit 38 constituting an exchange body is fixed inside the hollow case 40 by screws or other methods. The exchange unit 38 is periodically exchanged as a unit. That is, the replacement unit 38 is replaced with another replacement unit having the same configuration at regular intervals, for example, every six months or one year, in response to a request for the configuration of the radiation detector or battery charging. It is desirable that the state of the battery can be monitored on the side of the monitoring device, and in that case, it is desirable to replace the battery according to the one that has arrived first during battery consumption or calibration time. Since the replacement work can be performed using the replacement body as a replacement unit, it is possible to easily remove and bring back a portion that requires replacement or maintenance by a single operation. Calibration or maintenance can be performed at a predetermined maintenance facility.

  The exchange unit 38 has a metal case, and in the present embodiment, has a first metal case 42A and a second metal case 42B. Each of the first metal case 42A and the second metal case 42B is a hollow case having a box-like shape, and exhibits a shielding action against electromagnetic noise. Incidentally, although two cases are provided in this embodiment, it is also possible to make them one case. In the first case 42A, a radiation measuring unit 68 described below is accommodated, and a main part of the wireless communication unit 46 is accommodated. A battery 84 for the wireless communication unit is accommodated in the second case 42B. This battery has a larger capacity than the radiation measurement battery 66 described below, and its physical volume is also large. Therefore, an independent case 42B is provided. In any case, since the electrical part is accommodated in the metal case, an electromagnetically sufficient shielding action is exhibited.

  The radiation measuring unit 68 will be described. The radiation measurement unit 68 has a configuration corresponding to a conventional electronic personal dosimeter. However, in the present embodiment, a relatively large battery 66 is used. The sensor 50 is a semiconductor detector and detects γ rays 15 flying from the outside. Of course, other radiation can be detected, and a plurality of radiations may be detected. Various configurations for excluding the influence of cosmic rays and the like can be employed. An output signal from the sensor 50 is input to the comparator 56 via the preamplifier 52 and the amplifier 54.

  The comparator 56 outputs the output signal having a predetermined level or higher as a pulse signal to the measurement processor 58. Comparator 56 is a high discriminator. The measurement processor 58 is configured as a microcomputer in the present embodiment, and the measurement processor 58 includes a counter 60. The counter 60 counts the output pulses from the comparator 56 and holds the result. The counter 60 has an integrated count value. The integrated count value is held until a predetermined reset signal is given, that is, the count value is sequentially increased while radiation is continuously detected.

  The infrared transmission / reception unit 62 is a unit for exchanging signals with the infrared transmission / reception unit 70 of the other party using the infrared rays 72. Since the radiation measurement unit 44 and the wireless communication unit 46 are connected by such a non-electrical communication line, electrical insulation can be improved, and in particular, from the wireless communication unit 46 to the radiation measurement unit 68. It is possible to effectively prevent the wraparound of electromagnetic noise via the signal line.

  A battery 66 is connected to the power supply circuit 64, and battery power is supplied from the power supply circuit 64 to each component. The battery 66 is completely separate from the battery 84 described above, that is, the two batteries 66 and 84 are independent. As a result, even if the power supply voltage drops or becomes unstable during data transmission, the influence is prevented from reaching the radiation measuring unit 44, and from the wireless communication unit 46 to the radiation measuring unit 68 via the power supply line. Electromagnetic noise is effectively prevented from wrapping around. Reference numeral 68 represents a bag-like member having an electromagnetic shielding action. Of course, it may be a hard member. Since the sensor 50 measures the γ-ray 15, it is possible to accurately detect the γ-ray as long as the calibration is properly performed even if some metal members are present on the front surface.

  Next, the wireless communication unit 46 will be described. The infrared transmission / reception unit 70 is a module that performs infrared communication with the other infrared transmission / reception unit 62 described above. Both are close to each other. The communication processor 72 is constituted by a microcomputer in the present embodiment, and executes control of wireless communication. In addition, control of data acquisition from the radiation measurement unit is performed. The wireless communication unit 74 has functions of a transmission unit and a reception unit. An antenna 80 is connected to it.

  The antenna 80 is provided in a gap space between a metal case, specifically, the first metal case 42A and the hollow case 40, that is, a resin case. More specifically, it is mounted on the surface of the first metal case 42A. The first metal case 42A has a box-like shape extending in the longitudinal direction, the sensor 50 is disposed on one end side, and the antenna 80 is disposed on the other end side. Thereby, the influence of the electromagnetic noise on the sensor by the antenna 80 is reduced. Although it is possible to provide the antenna 80 outside the hollow case 40, in the present embodiment, since the hollow case 40 is made of resin, it is possible to adopt a configuration as shown in the figure. As a result, the antenna 80 can be physically protected.

  FIG. 4 shows a communication sequence between the monitoring device 12 and the measuring device 14. In the present embodiment, an inquiry is made from the measuring device 14 side to the monitoring device 12 at a predetermined time interval, specifically, at a time interval of 1 second. On the other hand, the monitoring device 12 generates a data request at regular intervals according to the dose. At system startup, for example, data requests are generated at intervals of 1 minute, and after it has been repeated 10 times, data requests are generated at intervals of 10 minutes, and further 5 times. When repeated, that is, when one hour has elapsed since the system was started, the request interval is adaptively set according to the dose level. More specifically, a data request at 1 minute intervals is set when the dose is high, a data request at 10 minute intervals is set when the dose is medium, and 1 hour when the dose is low. A data request at an interval is set. Of course, each numerical value is only an example. In any case, by varying the data request interval according to the dose, appropriate dose management with real-time property and battery consumption avoidance can be satisfied at the same time.

  This will be described more specifically with reference to FIG. First, in S10, the measurement device that is in the sleep state, specifically, the processor of the wireless communication unit is activated, and thereby an inquiry signal is sent to the monitoring device 12 in S12 by the action of the processor. On the monitoring device side, if the timing of data request has not been reached, no special response is made to this inquiry. On the side of the measuring device 14 that made the inquiry, the processor is in a standby state, that is, a state waiting for a data request signal from the monitoring device. The time is set to a short time, and then the transition to the sleep state is determined in S16. That is, the processor for wireless communication enters a sleep state in S18. In the measurement apparatus 14, such an inquiry is made at intervals of 10 seconds, for example. That is, in S20, the processor is activated, and thereby an inquiry signal is transmitted in S22.

  Here, when the monitoring device 12 determines that T time has elapsed since the previous data acquisition, it is determined in S26 that the data request signal is issued in response to the inquiry, and in S28, the data request signal is transmitted to the measuring device 14 side. Sent to. Usually, as shown in S24, a data request signal is received within the standby period, and the data request is recognized in S30 by the measuring device 14. Thereby, the latest data is read from the radiation measurement unit by the action of the processor, and the data is transmitted to the monitoring device 12. This is shown in S30.

  In the monitoring device 12, the latest data sent in this way is received in S34, and in S36, a receipt confirmation is issued from the monitoring device 12 to the measurement device 14. In response to this, the measuring apparatus 14 determines the transition to the sleep state in S38 and enters the sleep state in S40. And each process after S42 is implemented similarly to the above.

  In the monitoring device 12, when data is received, a timer is started with the reception timing or with the actual measurement time of the data, thereby monitoring whether or not a predetermined time T has elapsed. A data request signal is issued when it is determined that T has elapsed and an inquiry signal is received from the measurement device 14. As described above, the predetermined time T is variably set according to the dose or according to the situation.

  Incidentally, as shown in S52, when a forced reception instruction is issued by the user, an inquiry signal immediately after such a trigger is given is obtained without waiting for the elapse of the predetermined time T, and a data request is made at that timing. Is issued. As a result, the latest information can be promptly provided to the user.

  FIG. 5 shows an example of a display screen displayed on the monitoring device. Reference numeral 82 represents a display surface. It may be constituted by a touch screen or the like. The display field 84 is a part for displaying the dose equivalent rate. Of course, other information such as an accumulated dose may be displayed there. The time column 86 is a column for displaying when the displayed dose equivalent rate is based on data, and specifically, date and time information is displayed. In this case, the data acquisition time may be the time when the measured value is actually obtained, or may be the time when the data is received by the monitoring device. A trend graph or the like may be displayed on the display screen.

  In the status column 88, information about whether or not measurement is currently being executed is displayed in a confirming manner. For example, when replacing the replacement unit, the measurement is temporarily interrupted, and such information is also displayed in the field. In the present embodiment, two levels can be set, and reference numeral 90 indicates a column for displaying a value set as an alarm level. Reference numeral 92 denotes a column for displaying a value set as the attention level. If the current display value exceeds the alarm level, a predetermined alarm occurs. In this case, an alarm is notified using both display and sound. The same applies when the attention level is exceeded, and attention is drawn in a manner different from the alarm level. Reference numeral 94 is a column representing a communication state. Reference numeral 96 denotes a button for stopping the alarm when the buzzer as an alarm continues to sound. Reference numeral 98 denotes a button for causing the user to perform forced reception. When this button is pressed, the display fields 84 and 86 are updated.

  According to the above-described embodiment, information corresponding to personal exposure information can be acquired in a measurement apparatus installed indoors, and it is possible to estimate the exposure amount of a person around the outdoor measurement apparatus using the measurement result. Become. Or even if it cannot perform the exact estimation up to that point, it is possible to quickly detect a situation such as a dose increase and promptly issue an instruction to evacuate indoors. In the above embodiment, since the measuring device is battery-driven and performs data transfer by wireless communication, it is not necessary to install a power supply line or a communication line. As a result, it is possible to obtain an advantage that the operation is possible. In addition, even when replacement is required due to calibration, battery charging, etc., the replacement unit is configured to be removable, so that only the replacement unit can be replaced with a new one while leaving other members in the hollow case. Thus, it is possible to resume monitoring promptly. In addition, there is an advantage that the replacement work becomes easy. In the above-described embodiment, separate batteries are prepared for the radiation measurement unit and the wireless communication unit, and an advantage is obtained in that it is possible to effectively prevent the influence of voltage fluctuation and electromagnetic noise via the power supply line. Thereby, it is possible to stabilize the operation of the radiation sensor and obtain a more accurate measurement value. In addition, since the battery is made independent and the radiation measuring unit and the wireless communication unit are connected by a non-electric communication line, there is an advantage that electromagnetic noise can be prevented from wrapping therethrough. With the above, a highly practical dose monitoring system can be provided.

  10 Dose monitoring system, 12 Monitoring device, 14 Measuring device, 38 Exchange unit, 40 Hollow case, 44 Radiation measuring unit, 46 Wireless communication unit.

Claims (9)

A measuring device installed outdoors while being separated from the ground;
A monitoring device connected to the measuring device by wireless communication;
Including
The measuring device is
A hollow case having a sealing property;
A radiation measuring unit that is provided in the hollow case and measures radiation coming from outside;
A measurement-side wireless communication unit that is provided in the hollow case and intermittently transmits measurement data of the radiation measurement unit to the monitoring device;
Including
The monitoring device
A monitoring-side wireless communication unit that receives measurement data transmitted from the measurement device;
Calculation means for calculating dose information based on measurement data from the monitoring wireless communication unit,
Display means for displaying the dose information;
Including
In the hollow case, an exchange body having at least the radiation measuring unit is provided so as to be exchangeable, whereby the exchange body can be exchanged for another exchange body at the exchange time. The system of claim 1, wherein
The exchange unit includes the battery unit,
The dose monitoring system, wherein power from the battery unit is supplied to the radiation measurement unit and the measurement-side wireless communication unit. The system of claim 2, wherein
The battery unit includes a first battery and a second battery independent of each other,
The dose monitoring system, wherein the radiation measurement unit is supplied with power from the first battery, and the measurement-side wireless communication unit is supplied with power from the second battery. The system of claim 3, wherein
A dose monitoring system, wherein a signal is transmitted by optical communication between the radiation measurement unit and the measurement-side wireless communication unit. The system according to any one of claims 1 to 4,
The hollow case is made of a resin material,
The exchanger has an electromagnetic noise shielding case containing at least the radiation measurement unit,
The electromagnetic noise shielding case is detachably attached to the hollow case,
An antenna connected to the measurement-side communication unit is disposed between the hollow case and the electromagnetic noise shielding case,
A dose monitoring system characterized by that. The system according to any one of claims 1 to 5,
The measurement side communication unit intermittently transmits an inquiry signal, and transmits the measurement data when receiving a request signal from the monitoring side wireless communication unit,
The monitoring wireless communication unit transmits the request signal to the measuring wireless communication unit when the inquiry signal is received when the elapsed time from the previous measurement data acquisition time reaches a predetermined time. A dose monitoring system characterized by that. The system of claim 6, wherein
The monitoring wireless communication unit varies the predetermined time in accordance with a dose rate. The system of claim 7, wherein
The monitoring wireless communication unit transmits the request signal even when the elapsed time from the previous measurement data acquisition reaches a predetermined time when there is a forced reception instruction from the user. Characteristic dose monitoring system. 9. A system according to claim 1-8.
The dose information is dose equivalent rate information calculated based on the latest measurement data currently possessed by the monitoring device, and time information indicating the time when the latest measurement data is acquired is displayed together with the dose equivalent rate information. Dose monitoring system characterized by that.