JP2014001958A - Radiation detector and radiation detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation detector in which the degradation in measurement accuracy due to a measurer can be suppressed.SOLUTION: A radiation detector 1 includes: a radiation detection unit 10 which detects radiation; a start trigger acceptance unit 20 which accepts a user input as a trigger of measurement start; a measurement result calculation unit 30 which calculates a measurement result of radiation detected by the radiation detection unit 10 for a period from a measurement start timing to a measurement end timing, where the measurement start timing is a timing when a prescribed standby time has passed after acceptance of the user input as the trigger of measurement start by the start trigger acceptance unit 20 and the measurement end timing is a timing when a prescribed measurement time has passed after the measurement start timing; and a measurement result output unit 40 which outputs the measurement result calculated by the measurement result calculation unit 30.

Description

  The present invention relates to a radiation detector and a radiation detection method.

  In the radiation detector, a detection unit for detecting radiation and a display unit for displaying the measurement result are stored in one casing, and the measurement result of the radiation detected by the detection unit is displayed on the display unit in real time. There is something configured as follows. Such a radiation detector is disclosed in Patent Document 1, for example.

JP 2006-58103 A

  As a measurement method using the radiation detector as described above, for example, a method in which the measurer holds the detector in his / her hand or a position at which the measurer can observe the display portion. It is conceivable to perform measurement while fixing the. That is, the measurer needs to be near the detector at the time of measurement in order to confirm the measurement result displayed on the display unit in real time. In such a case, the accuracy of the measurement value may be impaired due to the influence of the radiation emitted from the measurer or the scattering component of the radiation caused by the measurer.

  An object of the present invention is to provide a radiation detector and a radiation detection method capable of suppressing deterioration in measurement accuracy caused by a measurer.

According to the present invention,
A radiation detector for detecting radiation;
A start trigger accepting unit for accepting user input as a trigger for starting measurement;
The measurement start timing is the time when a predetermined waiting time has elapsed since the start trigger reception unit received the user input that triggers the measurement start, and the measurement ends when the predetermined measurement time has elapsed from the measurement start timing As a timing, a measurement result calculation unit that calculates a measurement result of radiation detected by the radiation detection unit between the measurement start timing and the measurement end timing;
A measurement result output unit that outputs the measurement result calculated by the measurement result calculation unit;
A radiation detector is provided.

Moreover, according to the present invention,
Equipped with a radiation detector for detecting radiation,
A start trigger reception step for accepting user input as a trigger for measurement start;
The measurement start timing is defined as the time when a predetermined waiting time has elapsed from the time when the user input serving as the trigger for measurement start is received in the start trigger reception step, and the measurement ends when the predetermined measurement time has elapsed from the measurement start timing. As a timing, a measurement result calculation step for calculating a measurement result of the radiation detected by the radiation detection unit between the measurement start timing and the measurement end timing;
A measurement result output step for outputting the measurement result calculated by the measurement result calculation step;
A radiation detection method in which a computer executes is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the radiation detector and radiation detection method which can suppress the degradation of the measurement precision resulting from a measurer are implement | achieved.

It is an example of the functional block diagram of the radiation detector of this embodiment. It is a figure for demonstrating the measurement result calculation part of this embodiment. It is an example of the external appearance schematic diagram of the radiation detector of this embodiment. It is an example of the functional block diagram of the radiation detector of this embodiment. It is an example of the functional block diagram of the radiation detector of this embodiment. It is a figure for demonstrating the measurement result calculation part of this embodiment. It is a figure for demonstrating the measurement result calculation part of this embodiment.

  Hereinafter, embodiments of a radiation detector and a radiation detection method of the present invention will be described with reference to the drawings. Note that the drawings are only schematic diagrams for explaining the configuration of the invention, and the size, shape, number, and ratio of sizes between different members are not limited to those illustrated unless otherwise specified.

  Each unit of the present embodiment is realized by a microcomputer, a CPU, a memory, a program loaded in the memory, hardware such as a storage unit, software, or any combination of other members. It will be understood by those skilled in the art that there are various modifications to the implementation method.

<First Embodiment>
First, the outline | summary of the radiation detector and radiation detection method of this embodiment is demonstrated. The radiation detector according to the present embodiment does not immediately start measurement upon receiving an input as a trigger for starting measurement from the user, but from a timing at which a predetermined standby time has elapsed after receiving the input. Start measurement. Then, after the measurement is started, the measurement is terminated at a timing when a predetermined measurement time is passed, and then the measurement result of the radiation detected within the measurement time is displayed on a display, for example.

  Since it is such a configuration, the measurer installs the radiation detector of the present embodiment in a place where radiation is desired to be measured, and after performing an input serving as a trigger to start measurement, during a predetermined waiting time, It is possible to move away from the radiation detector to such an extent that the measurement result is not affected. Then, the measurement result displayed on the display can be confirmed by approaching the radiation detector or approaching the radiation detector after a predetermined measurement time has elapsed.

  According to such a radiation detector and radiation detection method of the present embodiment, it is possible to suppress deterioration in measurement accuracy caused by the measurer.

  Next, the radiation detector and radiation detection method of this embodiment will be described in detail.

  FIG. 1 shows an example of a functional block diagram of the radiation detector of the present embodiment. As shown in the figure, the radiation detector 1 of this embodiment includes a radiation detection unit 10, a start trigger reception unit 20, a measurement result calculation unit 30, and a measurement result output unit 40. Hereinafter, each part will be described.

  The radiation detection unit 10 is configured to detect radiation and output detection data to the measurement result calculation unit 30. The radiation detection unit 10 includes, for example, a scintillator and a photodetector.

  The scintillator emits light when exposed to radiation. In the present embodiment, any conventional scintillator can be employed, and the type, shape, and size are not particularly limited.

  The photodetector is optically coupled to the scintillator. When receiving the light emitted from the scintillator, the photodetector converts the light into an electric signal and outputs the electric signal to the measurement result calculation unit 30. In the present embodiment, any conventional photodetector such as a silicon photomultiplier or a high electron multiplier can be employed.

  Any conventional configuration can be adopted as the configuration of the radiation detection unit 10 including the scintillator and the photodetector.

  The start trigger receiving unit 20 receives a user input serving as a trigger for starting measurement. For example, the radiation detector 1 may be provided with a measurement start input button, and the start trigger receiving unit 20 may receive a press of the measurement start input button as a user input serving as a measurement start trigger. Note that the start trigger receiving unit 20 may receive a user input serving as a trigger for starting measurement using another input device such as a microphone or a touch panel display.

  When the measurement result calculation unit 30 acquires the radiation detection data from the radiation detection unit 10, the measurement result calculation unit 30 calculates the measurement result of the radiation detected by the radiation detection unit 10 using the detection data. The measurement result calculation unit 30 determines the measurement start timing and the measurement end timing based on the timing at which the start trigger receiving unit 20 receives a user input as a measurement start trigger, and from the measurement start timing to the measurement end timing. The measurement result is calculated using the radiation detection data detected by the radiation detection unit 10 during the period.

  The measurement result to be calculated is not particularly limited, and may be numerical data such as a dose equivalent rate, an absorbed dose, a radiation dose, or a count number for each energy of radiation. Alternatively, using these numerical data, an index that allows the user to easily determine the degree of the measurement result (eg, the degree of risk) may be calculated and used as the measurement result.

  The means by which the measurement result calculation unit 30 calculates numerical data such as the dose equivalent rate can be realized in accordance with the prior art. Therefore, the description here is omitted.

  The means by which the measurement result calculation unit 30 calculates the index as described above may be as follows, for example. For example, the measurement result calculation unit 30 divides numerical values such as the dose equivalent rate into a predetermined number of groups step by step, and an index (for example, the risk level) that allows the user to easily determine the degree of measurement result (for example, the degree of risk) for each group. Information (corresponding to 5 levels of 1 to 5 (5 is the most dangerous and 1 is the safest), 3 levels of red, yellow, and blue (red is dangerous, yellow is caution, blue is safe), etc.) Information). When the measurement result calculation unit 30 calculates the numerical data such as the dose equivalent rate using the detection data acquired from the radiation detection unit 10, the measurement result calculation unit 30 refers to the correspondence information and specifies the group to which the calculated numerical data belongs. An index associated with the group may be extracted as a measurement result.

  Next, the measurement start timing and the measurement end timing will be described with reference to FIG. As shown in FIG. 2, the measurement result calculation unit 30 sets a measurement start timing when a predetermined waiting time has elapsed since the start trigger reception unit 20 received a user input serving as a measurement start trigger. The time when a predetermined measurement time has elapsed from the measurement start timing is set as the measurement end timing.

  When the start trigger reception unit 20 receives a user input that triggers measurement start, the measurement result calculation unit 30 acquires information for specifying the timing (hereinafter, “trigger input timing specification information”) from the start trigger reception unit 20. To do. For example, when the start trigger receiving unit 20 receives a user input as a trigger for starting measurement, the measurement result calculating unit 30 acquires information indicating that fact from the start trigger receiving unit 20 as trigger input timing specifying information in real time. May be. In such a case, the measurement result calculation unit 30 can set the timing at which the trigger input timing specifying information is acquired as the timing at which the start trigger receiving unit 20 receives a user input as a measurement start trigger. Alternatively, when the start trigger receiving unit 20 receives a user input serving as a trigger for starting the measurement, the start trigger receiving unit 20 acquires time information at that time from a clock built in the radiation detector 1, and acquires the time information as trigger input timing specifying information. May be transmitted to the measurement result calculation unit 30.

  As shown in FIG. 1, the measurement result calculation unit 30 holds information (standby / measurement time information) indicating standby time and measurement time (design items) in advance. And the measurement result calculation part 30 will specify a measurement start timing and a measurement end timing using the said information and waiting | standby / measurement time information, if trigger input timing specific information is acquired. Note that the waiting time is measured within the waiting time after the measurement person installs the radiation detector of the present embodiment at a place where the measurement is desired to be performed, and performs an input as a trigger for starting the measurement. It is set to such an extent that it can be separated from the radiation detector 1 so as not to affect the result. For example, it may be 5 seconds or more, 15 seconds or more, or 1 minute or more.

  Next, an example of a unit that the measurement result calculation unit 30 acquires the detection data detected by the radiation detection unit 10 between the measurement start timing and the measurement end timing as described above will be described.

  As shown in FIG. 1, the measurement result calculation unit 30 can include detection start / end control means 31 that controls the start and end of radiation detection by the radiation detection unit 10.

  When the detection start / end control means 31 acquires the trigger input timing specifying information from the start trigger receiving unit 20, the information, the standby / measurement time information stored in advance, and a timer provided in the radiation detector 1, for example, Alternatively, by using a built-in clock, the measurement start timing when a predetermined waiting time has elapsed from the timing specified by the trigger input timing specifying information is specified. Then, the detection start / end control means 31 controls the radiation detection unit 10 to start detection of radiation from the specified measurement start timing. For example, the detection start / end control means 31 continues to determine whether or not the current time is the measurement start timing using the timer or the built-in clock provided in the radiation detector 1 after specifying the measurement start timing, When the measurement start timing is reached, an instruction to start detection may be output to the radiation detection unit 10 using this as a trigger. The radiation detection unit 10 starts detection of radiation according to the control of the detection start / end control means 31.

  Thereafter, the detection start / end control means 31 uses, for example, a timer or a built-in clock provided in the radiation detector 1 to specify the measurement end timing when a predetermined measurement time has elapsed from the measurement start timing. Then, the detection start / end control means 31 controls the radiation detection unit 10 so as to end the radiation detection at the specified measurement end timing. For example, the detection start / end control means 31 uses the timer or the built-in clock provided in the radiation detector 1 after specifying the measurement end timing, and continues to determine whether the current time is the measurement end timing, When the measurement end timing is reached, an instruction to end detection may be output to the radiation detection unit 10 using this as a trigger. The radiation detection unit 10 ends the detection of radiation according to the control of the detection start / end control means 31.

  And the measurement result calculation part 30 is the radiation detection part 10 by which the measurement start and the measurement end were controlled in this way, and detected the detection data of the radiation from the start to the end from the measurement start timing to the measurement end timing You may acquire as detection data which the radiation detection part 10 detected in the meantime.

  Returning to FIG. 1, the measurement result output unit 40 outputs the measurement result calculated by the measurement result calculation unit 30. The output means is not particularly limited, and an output device such as a display, a speaker, or a light can be used.

  The radiation detector 1 may include a storage unit that stores the measurement result calculated by the measurement result calculation unit 30 for a predetermined period.

  In FIG. 3, an example of the external appearance structure of the radiation detector 1 of this embodiment is shown. The illustrated radiation detector 1 includes a sensor unit 2 that detects radiation. The radiation incident from the sensor unit 2 enters the scintillator of the radiation detection unit 10, for example.

  The illustrated radiation detector 1 has a measurement start input button 4 for receiving a user input serving as a trigger for starting measurement. The start trigger receiving unit 20 receives a press of the measurement start input button 4 as a user input serving as a measurement start trigger.

  The illustrated radiation detector 1 has a display 3 for outputting the measurement result calculated by the measurement result calculation unit 30. The illustrated radiation detector 1 displays the dose equivalent rate calculated by the measurement result calculation unit 30 as the measurement result.

  The operation button 5 will be described in the following embodiment.

  According to the above description, the following radiation detection method is also described.

Equipped with a radiation detector for detecting radiation,
A start trigger reception step for accepting user input as a trigger for measurement start;
The measurement start timing is defined as the time when a predetermined waiting time has elapsed from the time when the user input serving as the trigger for measurement start is received in the start trigger reception step, and the measurement ends when the predetermined measurement time has elapsed from the measurement start timing. As a timing, a measurement result calculation step for calculating a measurement result of the radiation detected by the radiation detection unit between the measurement start timing and the measurement end timing;
A measurement result output step for outputting the measurement result calculated by the measurement result calculation step;
A radiation detection method performed by a computer.

  Next, the effect of this embodiment is demonstrated.

  In the case of the present embodiment, there is a predetermined waiting time until the measurement is started after the measurement start operation (user input that triggers the measurement start) is performed on the radiation detector 1. For this reason, the measurer installs the radiation detector 1 at a predetermined position, performs a measurement start operation (user input that triggers measurement start), and then affects the measurement result during a predetermined standby time. The distance from the radiation detector 1 can be taken to such an extent that it does not affect.

  Thereafter, the radiation detector 1 measures radiation at the installed position and outputs a measurement result (dose equivalent rate or the like). Therefore, the measurer can approach the radiation detector 1 after the measurement is completed or approach the radiation detector 1 and check the output measurement result.

  According to the present embodiment as described above, it is possible to suppress measurement accuracy degradation caused by the measurer, that is, degradation of measurement accuracy due to the radiation emitted from the measurer and the influence of the scattering component of the radiation caused by the measurer. it can.

  Further, according to the present embodiment, the radiation detector 1 can be installed even in a place where it is difficult for the measurer to stay for a long time, such as on a tree or in a manhole. If the radiation detector 1 can continue to be installed during the measurement and the radiation detector 1 can be recovered, the radiation can be measured. .

<Second Embodiment>
FIG. 4 shows an example of a functional block diagram of the radiation detector of the present embodiment. As illustrated, the radiation detector 1 of the present embodiment includes a radiation detection unit 10, a start trigger reception unit 20, a measurement result calculation unit 30, a measurement result output unit 40, a standby time input reception unit 50, And a measurement time input receiving unit 60. In addition, it can also be set as the structure which does not provide either the waiting time input reception part 50 or the measurement time input reception part 60. FIG.

  Hereinafter, the measurement result calculation unit 30, the standby time input reception unit 50, and the measurement time input reception unit 60 will be described. In addition, since the structure of the radiation detection part 10, the start trigger reception part 20, and the measurement result output part 40 is the same as that of 1st Embodiment, description here is abbreviate | omitted.

  The standby time input receiving unit 50 receives a user input for setting a standby time. And the measurement result calculation part 30 hold | maintains the information which shows the standby | waiting time which the standby | waiting-time input reception part 50 received the input, and using this information, as demonstrated in 1st Embodiment, measurement start timing Is identified.

  The measurement time input receiving unit 60 receives user input for setting the measurement time. And the measurement result calculation part 30 hold | maintains the information which shows the measurement time which the measurement time input reception part 50 received the input, and using this information, as demonstrated in 1st Embodiment, measurement completion timing Is identified.

  In addition, the other structure of the measurement result calculation part 30 is the same as that of 1st Embodiment.

  The means by which the standby time input reception unit 50 and the measurement time input reception unit 60 accept user input as described above is not particularly limited, and any input buttons, touch panel display, microphone, and the like provided in the radiation detector 1 can be used. This can be realized by using an input device.

  In FIG. 3, an example of the external appearance structure of the radiation detector 1 of this embodiment is shown. The sensor unit 2, the display 3, and the measurement start input button 4 are as described in the first embodiment.

  The operation button 5 accepts a user input for setting a waiting time and / or a user input for setting a measurement time. For example, when the uppermost round button among the three operation buttons 5 is pressed, each time the button is pressed, the mode is switched from the measurement mode to the standby time setting mode to the measurement time setting mode. When the standby time setting mode is set, the standby time set at that time is displayed on the display 3. In this state, when one set of triangular buttons facing upward and downward among the operation buttons 5 is pressed, the standby time displayed on the display 3 is changed. Then, when the round button at the top of the operation buttons 5 is pressed again to switch to another mode, the standby time held by the measurement result calculation unit 30 is set to the standby time displayed on the display 3 at that time. Updated. The measurement time is also updated by the same means.

  According to the radiation detector 1 of the present embodiment described above, the measurer can freely change the standby time and / or the measurement time.

  For example, when measuring radiation in a place where there are no obstacles in the vicinity, the measurer installs the radiation detector 1, and after making an input that serves as a trigger to start measurement, the measurer easily starts from the radiation detector 1. Can take distance. In such a case, for example, by setting the waiting time to a small value such as 10 seconds or 20 seconds, the waiting time can be reduced and work efficiency can be improved.

  On the other hand, when detecting radiation in places where obstacles exist in the vicinity, such as on trees or in manholes, the measurer installs the radiation detector 1 and performs an input that triggers measurement. After that, sufficient time is required to take a distance from the radiation detector 1 so as not to affect the measurement result. In such a case, depending on the surrounding environment, for example, the standby time can be set to an appropriate time such as 1 minute, 5 minutes, or 10 minutes.

  Further, when the dose equivalent rate of the target object and the space is low, the statistics of the radiation detected by the radiation detection unit 10 are reduced, so that the measurement error is increased. Therefore, when measuring at a place where the dose equivalent rate is predicted to be low, it is possible to set a sufficient measurement time that can integrate statistics with which measurement errors are sufficiently reduced.

  As mentioned above, according to the radiation detector of this embodiment, the effect demonstrated in 1st Embodiment is realizable. Moreover, since the radiation detector of this embodiment can change standby | waiting time and / or measurement time according to a measurement environment, for example, it can improve a measurement precision more.

<Third Embodiment>
FIG. 5 shows an example of a functional block diagram of the radiation detector of the present embodiment. As shown in the figure, the radiation detector 1 of this embodiment includes a radiation detection unit 10, a start trigger reception unit 20, a measurement result calculation unit 30, and a measurement result output unit 40. Although not shown, the radiation detector 1 of the present embodiment can include at least one of the standby time input reception unit 50 and the measurement time input reception unit 60.

  Hereinafter, the measurement result calculation unit 30 will be described. The radiation detection unit 10, the start trigger reception unit 20, the measurement result output unit 40, the standby time input reception unit 50, and the measurement time input reception unit 60 are as described in the first and second embodiments. Since there is, explanation here is omitted.

  In the first embodiment, the detection start / end control means 31 of the measurement result calculation unit 30 starts the detection of radiation from the measurement start timing and controls the radiation detection unit 10 to end the detection of radiation at the measurement end timing. did. That is, as shown in FIG. 6, the measurement start timing coincides with the timing at which the radiation detection unit 10 starts measurement, and the measurement end timing coincides with the timing at which the radiation detection unit 10 ends measurement.

  In the present embodiment, as shown in FIG. 7, the detection start / end control means 31 starts detection of radiation before a predetermined time (preparation time: design matter) from the measurement start timing, and the predetermined time from the measurement end timing. (Adjustment time: design matter) The radiation detection unit 10 is controlled to end the detection of radiation later.

  In addition, the detection start / end control means 31 may start the detection of radiation from a predetermined time (preparation time) before the measurement start timing, and may control the radiation detection unit 10 to end the radiation detection at the measurement end timing. it can. Further, the detection start / end control means 31 can also start the detection of radiation from the measurement start timing and control the radiation detection unit 10 to end the detection of radiation after a predetermined time (adjustment time) from the measurement end timing. .

  As illustrated in FIG. 5, the measurement result calculation unit 30 extracts detection data detected by the radiation detection unit 10 from the measurement start timing to the measurement end timing from the measurement data acquired from the radiation detection unit 10. Data extraction means 32 is included. The data extraction unit 32 acquires information indicating the preparation time and / or adjustment time from the detection start / end control unit 31 and uses the information to determine a predetermined value from the beginning of the measurement data acquired from the radiation detection unit 10. The detection data detected by the radiation detection unit 10 between the measurement start timing and the measurement end timing is extracted by removing the time (preparation time) and / or the predetermined time (adjustment time) from the end. be able to.

  As mentioned above, according to the radiation detector of this embodiment, the effect demonstrated in the 1st and 2nd embodiment is realizable. Moreover, since the radiation detector of this embodiment can calculate the measurement result by removing the measurement data immediately after the start of measurement and immediately before the end of measurement, the measurement accuracy can be further improved.

DESCRIPTION OF SYMBOLS 1 Radiation detector 2 Sensor part 3 Display 4 Measurement start input button 5 Operation button 10 Radiation detection part 20 Start trigger reception part 30 Measurement result calculation part 31 Detection start / end control means 32 Data extraction means 40 Measurement result output part 50 Standby time Input reception part 60 Measurement time input reception part

Claims (7)

A radiation detector for detecting radiation;
A start trigger accepting unit for accepting user input as a trigger for starting measurement;
The measurement start timing is the time when a predetermined waiting time has elapsed since the start trigger reception unit received the user input that triggers the measurement start, and the measurement ends when the predetermined measurement time has elapsed from the measurement start timing As a timing, a measurement result calculation unit that calculates a measurement result of radiation detected by the radiation detection unit between the measurement start timing and the measurement end timing;
A measurement result output unit that outputs the measurement result calculated by the measurement result calculation unit;
A radiation detector. The radiation detector according to claim 1.
The measurement result calculation unit is a radiation detector that holds information indicating the standby time. The radiation detector according to claim 2, wherein
A radiation detector further comprising a standby time input receiving unit that receives a user input for setting the standby time. The radiation detector according to any one of claims 1 to 3,
A radiation detector further comprising a measurement time input receiving unit that receives a user input for setting the measurement time. The radiation detector according to any one of claims 1 to 4,
The measurement result calculation unit has detection start / end control means for controlling start and end of radiation detection by the radiation detection unit,
The detection start / end control means is a radiation detector that starts detection of radiation from the measurement start timing and controls the radiation detection unit to end detection of radiation at the measurement end timing. The radiation detector according to any one of claims 1 to 5,
The measurement result calculation unit is a radiation detector that calculates a dose equivalent rate. Equipped with a radiation detector for detecting radiation,
A start trigger reception step for accepting user input as a trigger for measurement start;
The measurement start timing is defined as the time when a predetermined waiting time has elapsed from the time when the user input serving as the trigger for measurement start is received in the start trigger reception step, and the measurement ends when the predetermined measurement time has elapsed from the measurement start timing. As a timing, a measurement result calculation step for calculating a measurement result of the radiation detected by the radiation detection unit between the measurement start timing and the measurement end timing;
A measurement result output step for outputting the measurement result calculated by the measurement result calculation step;
A radiation detection method performed by a computer.

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