JP2014126555A - Radiation dosimetry device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an ordinary person who is a non-specialist to casually, easily, efficiently, and accurately measure a dose of radiation.SOLUTION: A radiation dosimetry device 100 includes a measurement state detection part 4. It is necessary to keep some measurement conditions for the radiation dosimetry device 100 to measure dosage accurately. Therefore, the radiation dosimetry device 100 of the measurement state detection part 4 is detected, and a measuring method is notified to a user so that a measurement state may fulfill the measurement conditions.

Description

  The present invention relates to a radiation dose measuring apparatus.

  Conventionally, radiation dose measuring apparatuses have been mainly used by workers engaged in radiation work in radiation control areas in nuclear power plants, radiation-related laboratories, hospitals, and the like. For example, by detecting radiation leakage due to an accident or failure of a radiation generator in a radiation management area, an operator can evacuate to a safe place. In addition, the radiation dose measuring device may measure the absorbed dose (μSv) of radiation that is exposed to the worker during daily work. However, since the occurrence of the Fukushima Daiichi nuclear power plant accident due to the Great East Japan Earthquake, radiation dose measuring devices have been used in ordinary households. For example, a radiation dose measuring apparatus is used for grasping an area with a high radiation dose called a hot spot or for personally managing an exposure dose.

  As such a radiation dose measuring device, there is a small radiation dose measuring device of a type called a general Geiger counter or a scintillator. A user carries a small radiation dose measuring device to a place where the measurement is performed, holds a probe for detecting radiation, which is a device body or a part of the device, and measures the radiation dose in the space.

  By the way, depending on the measurement conditions such as the position and direction of the measuring apparatus, a large variation occurs in the measurement results. In particular, in the case of an IP measuring device that is held by a user's hand, measurement conditions such as the position and direction of the measuring device are difficult to stabilize, and are easily different for each user depending on the height of the user.

  The Ministry of Education, Culture, Sports, Science and Technology issued non-patent document 1 and decided to unify the measurement standards. According to Non-Patent Document 1, the points to be noted when measuring the air dose rate include conditions such as setting the distance of the measuring device or probe from the ground surface to 1 m, and keeping the direction parallel to the ground surface. Yes. However, in practice, the user may determine the position of the measuring device appropriately by visual inspection, or the measuring device may change its position during measurement because it is held by hand. There is a problem that measurement is not performed while satisfying the measurement conditions along the line. In addition, when attempting to perform measurement that accurately satisfies these measurement conditions, it is necessary to perform operations such as setting the position accurately using a tool such as a scale, which greatly impairs convenience. Therefore, it is still difficult for a general person who is a non-expert to easily measure radiation dose easily, efficiently, and accurately.

  According to Patent Document 1, in order to measure the surface contamination density of wastes or the like with a survey meter with high accuracy, a technique is proposed that shows a user a constant speed at which the probe is moved.

Guidelines on radiation measurement, Ministry of Education, Culture, Sports, Science and Technology, October 21, 2011

Japanese Patent No. 4443507

  According to the invention described in Patent Document 1, it is possible to move the probe at a constant speed in order to measure the surface contamination density. Specifically, according to the invention described in Patent Document 1, the moving speed of the probe can be instructed to the user by causing the plurality of light emitting elements to emit light sequentially at a predetermined speed. However, the invention described in Patent Document 1 only indicates the moving speed, and does not detect whether the user is moving the probe at the instructed speed. For a user who is familiar with the radiation dose measuring apparatus such as an expert, it may be sufficient to indicate the moving speed with the light emitting element array, but this is not sufficient for a general person who is not a specialist. That is, it can be said that there is a demand from the market for a more improved method for ensuring that the measurement state of the radiation dose measuring apparatus satisfies a predetermined measurement condition.

  Then, an object of this invention is to enable it to measure a radiation dose appropriately irrespective of a user.

The present invention is, for example,
A radiation dose measuring device for measuring radiation dose,
A sensor for measuring radiation dose;
Storage means for storing measurement conditions of the radiation dose measuring device for measuring the radiation dose by the sensor;
Detecting means for detecting a measurement state of the radiation dose measuring device;
Notification means for notifying that the measurement state of the radiation dose measuring device is to be changed when the measurement state detected by the detection means and the measurement condition stored in the storage means do not match. Features.

  According to the present invention, the measurement state of the radiation dose measuring device is measured, and if the measurement state does not satisfy the predetermined measurement condition, a notification is given to change the measurement state of the radiation dose measuring device. Therefore, the radiation dose can be appropriately measured even by a general person who is not a specialist regardless of the user.

FIG. 1 is a block diagram showing functions provided in the radiation dose measuring apparatus 100 according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating functions of the radiation detection unit. FIG. 3 is a flowchart showing the operation of the arithmetic control unit. FIG. 4 is a flowchart showing an interrupt process when the measurement state does not satisfy a predetermined measurement condition. FIG. 5 is a diagram illustrating a measurement state detected using a measurement state sensor and an example of a sensor that can be employed as the measurement state sensor. FIG. 6 is a flowchart showing the operation of the measurement state detection unit in an application example in which the distance from the ground surface to the radiation dose measuring apparatus is a measurement condition. FIG. 7 is a flowchart showing the operation of the measurement state detection unit in an application example in which the measurement direction is the radiation measurement direction. FIG. 8 is a flowchart showing the operation of the measurement state detection unit in an application example in which the measurement condition is that the sensor surface of the radiation detector is not shielded by an obstacle or the like. FIG. 9 is a flowchart showing the operation of the measurement condition setting unit. FIG. 10 is a block diagram showing functions provided in the radiation dose measuring apparatus according to the second embodiment of the present invention. FIG. 11 is a block diagram of a general microcomputer system.

<First embodiment>
FIG. 1 is a block diagram showing functions provided in the radiation dose measuring apparatus 100 according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating functions of the radiation detection unit 1.

  The radiation dose measuring apparatus 100 includes a radiation detection unit 1, a pulse accumulation unit 2, a calculation control unit 3, a measurement state detection unit 4, an output unit 5, and a measurement condition setting unit 6. The radiation detecting unit 1 and the pulse accumulating unit 2 are provided in the apparatus main body of the radiation dose measuring apparatus 100 and function as a measuring unit that measures radiation every predetermined time T. The calculation control unit 3 calculates a radiation dose from the measured radiation and controls each unit. The measurement state detection unit 4 includes a measurement state sensor 41 that detects the measurement state of the radiation dose measuring apparatus 100. The measurement state sensor 41 functions as a detection unit that detects the measurement state of the radiation dose measuring apparatus 100. The measurement state includes, for example, the distance from the ground surface and the object to be measured, whether the radiation dose measuring device 100 is horizontal, the direction in which the radiation dose measuring device 100 faces, the impact applied to the radiation dose measuring device 100, the radiation dose. These are the air volume and direction of the wind with respect to the measuring apparatus 100. The measurement state detection unit 4 further includes a measurement method notification unit 42 that notifies the operator of an operation to be performed by the operator. As described above, the measurement method notification unit 42 notifies the change of the measurement state of the radiation dose measuring apparatus when the measurement state detected by the detection unit does not match the measurement condition stored in the storage unit. Functions as a notification means. The output unit 5 outputs a dose, an operation method, and the like to the user. The measurement condition setting unit 6 includes a distance from the ground surface and an object to be measured, whether the radiation dose measuring device 100 is horizontal, a direction in which the radiation dose measuring device 100 is directed, an impact applied to the radiation dose measuring device 100, radiation. A permissible amount and a threshold value such as a wind amount and a wind direction of the amount measuring device 100 are set, and a set value is held.

  The radiation detection unit 1 is a sensor that measures a radiation dose, and outputs a pulse signal indicating that the radiation has been detected when the radiation is detected. The radiation detector 7 is a sensor that generates a change in current when it detects radiation. The radiation detector 7 is, for example, a Geiger-Muller counter tube, a semiconductor diode (photodiode), a device combining a scintillator and a photomultiplier tube (scintillation detector), or the like. The amplifier 8 converts the current output from the radiation detector 7 into a voltage, further amplifies it, and outputs it to the comparator 9. The comparator 9 compares the output from the amplifier 8 with a reference value (threshold value) a and performs binarization. The comparator 9 does not output a pulse signal (detection pulse P) unless the output exceeds the threshold value a. When the radiation detection unit 1 receives the command C from the arithmetic control unit 3, the radiation detection unit 1 is activated to shift to an operation mode in which measurement is performed. On the other hand, when the radiation detection unit 1 receives the command S from the calculation control unit 3, the radiation detection unit 1 transitions to a power saving mode in which measurement is not performed.

  The pulse accumulation unit 2 includes a pulse addition unit 21 and a count unit 22. The pulse adder 21 cumulatively counts the pulses input from the pulse output unit 12. The count unit 22 stores the numerical value cumulatively added by the pulse addition unit 21. The pulse accumulating unit 2 is activated when receiving the instruction C from the arithmetic control unit 3 and shifts to an operation (active) mode in which cumulative addition of pulses is executed. On the other hand, when the pulse accumulating unit 2 receives the command S from the arithmetic control unit 3, the pulse accumulating unit 2 transits to a power saving (inactive) mode in which the cumulative addition is not performed. The pulse adding unit 21 monitors whether or not a pulse is output from the pulse output unit 12. When a pulse is output from the pulse output unit 12, the pulse addition unit 21 reads the count value I stored in the count unit 22 and adds 1 to obtain a sum (I + 1). Then, the pulse addition unit 21 stores the sum (I + 1) as the calculation result in the count unit 22 as a new count value I. The pulse accumulating unit 2 is also controlled in power supply by the arithmetic control unit 3. For example, the pulse accumulating unit 2 is activated when the command C is received from the arithmetic control unit 3 and shifts to an operation mode in which accumulation processing is executed. On the other hand, when the pulse accumulating unit 2 receives the command S from the arithmetic control unit 3, the pulse accumulating unit 2 transits to a power saving mode in which the accumulation process is not executed.

  The output unit 5 includes a display notification unit 51 that outputs visual information, a voice notification unit 52 that outputs auditory information, and a vibration notification unit 53 that outputs sensory information.

  The measurement condition setting unit 6 includes a measurement condition input unit 61 such as a key or a button for inputting measurement conditions, and a measurement condition storage unit 62 for storing measurement conditions input through the measurement condition input unit 61. The measurement condition storage unit 62 functions as a storage unit that stores the measurement conditions of the radiation dose measuring apparatus 100.

  FIG. 3 is a flowchart showing the operation of the arithmetic control unit 3. The processing according to this flowchart is started when the main switch of the radiation dose measuring apparatus 100 is turned on.

  In S301, the arithmetic control unit 3 executes initial setting. Initial settings include resetting flags and initializing variables.

  In S302, the calculation control unit 3 transmits a command C to the radiation detection unit 1, the pulse accumulation unit 2, the measurement state detection unit 4, the output unit 5, and the measurement condition setting unit 6 to activate each unit.

  In S303, the arithmetic control unit 3 determines whether or not the elapsed time t from the start of radiation detection exceeds a predetermined time T. Using the predetermined time T as a unit, the radiation detection unit 1 detects radiation, and the pulse accumulation unit 2 accumulates the number of pulses. The calculation of the radiation dose is executed every predetermined time T. That is, the predetermined time T is a time interval for executing processing for radiation dose measurement. Until the elapsed time t exceeds the predetermined time T, the calculation control unit 3 involved in the calculation of the radiation dose in the calculation control unit 3 stops operating. This is to reduce power consumption as much as possible. The arithmetic control unit 3 includes a counter or a timer inside. Using these, the arithmetic control unit 3 starts detecting radiation and measures the elapsed time t from the hand (elapsed time t after the arithmetic control unit 3 involved in the calculation of the radiation dose is stopped). The arithmetic control unit 3 monitors whether or not the elapsed time t has exceeded the predetermined time T. When the elapsed time t exceeds the predetermined time T, the process proceeds to S304.

  In S <b> 304, the arithmetic control unit 3 reads out the pulse number k stored in the count unit 22 of the pulse accumulating unit 2 and substitutes the pulse number k into the buffer variable K. The arithmetic control unit 3 erases the pulse number k stored in the count unit 22.

  In S <b> 305, the arithmetic control unit 3 obtains the radiation dose by multiplying a buffer variable K indicating the number of detections (number of pulses) of radiation detected during the predetermined time T by a predetermined calibration constant. The radiation dose may be an air dose (nGy) or an absorbed dose (μSv). Examples of the calibration constant include a calibration constant X corresponding to the configuration of the radiation detector 7 and a calibration constant Y corresponding to a predetermined time T that dynamically changes. Since the internal configuration of the radiation detector 7 is determined at the design stage, the calibration constant X is also determined at this stage and stored in a ROM or the like. On the other hand, the calibration constant Y changes dynamically. As a method for obtaining the calibration constant Y corresponding to the predetermined time T, a mathematical formula may be used, or a table may be used. The table may not register the predetermined time T and the calibration constant Y for all combinations. In this case, the calculation control unit 3 may calculate an unregistered calibration constant Y by linear interpolation.

  The arithmetic control unit 3 obtains the radiation dose using the following equation and substitutes it into the buffer variable R.

R = K, X, Y
In S <b> 306, the arithmetic control unit 3 issues a command O for outputting the buffer variable R indicating the calculated radiation dose to the output unit 5, so that a numerical value indicating the radiation dose is displayed on the display notification unit 51 of the output unit 5. Output.

  FIG. 4 is a flowchart showing an interrupt process when the measurement state does not satisfy a predetermined measurement condition. The interrupt process is executed in parallel with the main process shown in FIG.

  In S401, the arithmetic control unit 3 determines whether an interrupt has occurred. When the measurement state detection unit 4 determines that the detected measurement state does not satisfy the predetermined measurement condition, the measurement state detection unit 4 executes an interrupt. When an interrupt from the measurement state detection unit 4 occurs, the process proceeds to S402.

  In S <b> 402, the calculation control unit 3 causes the output unit 5 to output the operation method notified from the measurement state detection unit 4. The output of the operation method is executed by any of the display notification unit 51, the voice notification unit 52, and the vibration notification unit 53. The display notification unit 51, the voice notification unit 52, and the vibration notification unit 53 may all output, or two or one designated by the calculation control unit 3 may execute the operation method output. The operation method output here includes, for example, a notification prompting the user to change the measurement state, a notification indicating how the measurement state should be changed, a notification indicating how much the measurement state should be changed, and measurement For example, a notification indicating a difference between the state and the measurement condition, a notification indicating how much the measurement state and the measurement condition match or do not match, and the like. As described above, the operation method may be information that indicates that the measurement state does not match the measurement condition or information that can prompt the user to bring the measurement state closer to the measurement condition.

  FIG. 5 is a diagram illustrating a measurement state detected using the measurement state sensor 41 and an example of a sensor that can be employed as the measurement state sensor 41. As shown in FIG. 5, the measurement state sensor 41 includes a distance from the measurement object or the ground surface to the measurement state sensor 41 of the radiation dose measuring device 100, a measurement direction (an inclination from the horizontal plane of the radiation dose measuring device 100, a radiation dose). Direction and orientation in which the measuring device 100 is directed), fingers and other obstacles covering the measurement surface of the radiation detector 7, impact applied to the radiation dose measuring device 100, place where the radiation dose measuring device 100 is installed, Measurement states such as the moving speed and acceleration of the radiation dose measuring apparatus 100, the altitude of the radiation dose measuring apparatus 100, the wind direction of the wind blowing on the radiation dose measuring apparatus 100, the air volume, and the wind speed are detected. For example, an ultrasonic sensor, an infrared sensor, an object distance recognition camera, or the like functions as a distance measuring unit that measures a distance from a measurement object or the ground surface to a radiation dose measuring device. Moreover, an acceleration sensor, a gyro sensor, etc. function as a horizontal measurement means which detects whether the radiation dose measuring apparatus 100 is installed horizontally. Further, the touch sensor and the magnetic sensor function as shielding detection means for detecting whether or not the radiation detector 7 is shielded by an obstacle. Moreover, a GPS sensor, an electronic magnetic compass, etc. function as a direction detection means for detecting the direction in which the radiation dose measuring device 100 is facing. Further, the acceleration sensor functions as an impact detection unit that detects an impact applied to the radiation dose measuring apparatus 100. Further, the measurement state sensor 41 may include means for detecting any of the altitude of the radiation dose measuring apparatus 100, the wind direction of the radiation dose measuring apparatus 100, and the air volume.

  The measurement method notification unit 42 refers to the measurement state sensor 41, grasps the detected measurement state, and performs an operation for adapting the measurement state of the radiation dose measuring apparatus 100 to the measurement condition stored in the measurement condition storage unit 62. A command for notifying the user of the contents is issued to the arithmetic control unit 3.

  The measurement state detection unit 4 operates differently depending on the measurement state to be detected. Here, application examples will be shown with the distance from the ground surface of the radiation dose measuring apparatus 100, the measurement direction of radiation, and shielding of the radiation detection mechanism as measurement conditions. The measurement state detection unit 4 may detect a plurality of measurement states at the same time.

<Distance from the ground surface>
FIG. 6 is a flowchart showing the operation of the measurement state detection unit 4 in an application example in which the distance from the ground surface to the radiation dose measuring apparatus 100 is a measurement condition. As the measurement state sensor 41 in this application example, an ultrasonic distance sensor, an infrared distance sensor, or the like can be employed. When the command CW issued by the arithmetic control unit 3 is received, the measurement state sensor 41 and the measurement method notification unit 42 start operation.

  In S <b> 601, the measurement state detection unit 4 performs initial setting such as setting the measurement condition read from the measurement condition storage unit 62 in the measurement method notification unit 42. The measurement condition here is a reference distance from the ground surface to the radiation dose measuring apparatus 100, for example, 1 m.

  In S602, the measurement state sensor 41 measures the distance from the ground surface.

  In S603, the measurement method notifying unit 42 compares the measurement state measured by the measurement state sensor 41 with the measurement condition, and determines whether the measurement state appropriately satisfies the measurement condition. For example, it is determined whether or not the distance D from the ground surface detected by the measurement state sensor 41 is coincident with the reference distance d that is a measurement condition. If the distance D matches the reference distance d, the measurement state satisfies the measurement condition, and the process proceeds to S604.

  In S604, the measurement method notification unit 42 interrupts the arithmetic control unit 3, issues a notification command A indicating that the measurement state satisfies the measurement condition (measurement state is good), and S602. Proceed to When the calculation control unit 3 receives the notification command A, the calculation control unit 3 outputs a notification indicating that the measurement state is good from the output unit 5.

  On the other hand, if the distance D does not match the reference distance d in S603, the measurement state does not satisfy the measurement condition, and the process proceeds to S605. In S605, the measurement method notification unit 42 determines whether the distance D measured by the measurement state sensor 41 is longer than the reference distance d. If the distance D is longer than the reference distance d, the process proceeds to S606.

  In S <b> 606, the measurement method notification unit 42 issues an interrupt to the calculation control unit 3 and issues a notification command B for prompting the user to lower the holding position of the radiation dose measuring apparatus 100. When the calculation control unit 3 receives the notification command B, the calculation control unit 3 outputs a notification that prompts the user to lower the holding position of the radiation dose measuring apparatus 100 from the output unit 5. On the other hand, if the distance D is not longer than the reference distance d, that is, if the distance D is shorter than the reference distance d, the process proceeds to S607.

  In S <b> 607, the measurement method notification unit 42 interrupts the calculation control unit 3 and issues a notification command C for prompting the user to raise the holding position of the radiation dose measuring apparatus 100. When the calculation control unit 3 receives the notification command C, the calculation control unit 3 outputs a notification that prompts the user to raise the holding position of the radiation dose measuring apparatus 100 from the output unit 5.

  Thus, the measurement method notification unit 42 may calculate a difference between the distance D and the reference distance d and output the difference to the calculation control unit 3. The arithmetic control unit 3 may prompt the user to raise or lower the holding position of the radiation dose measuring apparatus 100 by outputting the difference between the distance D and the reference distance d from the output unit 5. Information on the difference between the distance D and the reference distance d may be output from the output unit 5 together with a message (notification) that prompts the user to operate.

<Inclination of radiation dose measuring apparatus 100>
FIG. 7 is a flowchart showing the operation of the measurement state detection unit 4 in an application example in which the measurement direction of radiation is a measurement condition. The measurement state sensor 41 in this application example can be configured using a triaxial acceleration sensor or the like. In accordance with the instruction CW issued by the arithmetic control unit 3, the measurement state sensor 41 and the measurement method notification unit 42 are activated. The front / rear / left / right directions of the radiation dose measuring apparatus 100 are front / rear / left / right directions when the user views the output unit 5 of the radiation dose measuring apparatus 100. The front-rear and left-right directions are merely examples for making the explanation easy to understand, and may be called the first direction to the n-th direction (n is a natural number of 2 or more).

  In S701, the measurement method notification unit 42 initializes the measurement state sensor 41 and shifts it to a measurable state.

  In S <b> 702, the measurement method notification unit 42 determines whether the sensor surface of the radiation dose measuring apparatus 100 is parallel (that is, horizontal) to the ground surface by using the measurement state sensor 41 in the lateral acceleration. X, longitudinal acceleration Y, and height acceleration Z are measured.

  In step S <b> 703, the measurement method notification unit 42 determines whether the radiation dose measuring apparatus 100 is horizontal based on the measurement result of the measurement state sensor 41. For example, the measurement method notification unit 42 reads the set values x, y, and z set in the measurement condition storage unit 62, and the measurement result is a lateral acceleration X, a longitudinal acceleration Y, and a height acceleration. Compare with Z to determine if it is horizontal. Specifically, whether or not the following expression is satisfied may be determined by a logical operation. If the following equation is satisfied, the radiation dose measuring apparatus 100 is not horizontal, and the process proceeds to S705. On the other hand, if the following equation is not satisfied, the radiation dose measuring apparatus 100 is horizontal, and the process proceeds to S704. As described above, the measurement method notification unit 42 and the measurement state sensor 41 are the horizontal measurement that detects whether or not the radiation dose measuring device 100 is horizontally installed as the measurement state of the radiation dose measuring device 100. Functions as a means.

X ≠ x ∨ Y ≠ y ∨ Z ≠ z
In S <b> 704, the measurement method notification unit 42 executes an interrupt to notify that the measurement state is good, and issues a notification command D. Thereafter, the process returns to S702.

  In S <b> 705, the measurement method notification unit 42 determines whether the radiation dose measuring apparatus 100 is tilted with respect to the left-right direction based on the measurement result of the measurement state sensor 41. For example, the measurement method notification unit 42 determines the set value x corresponding to the lateral acceleration X detected by the measurement state sensor 41 using the following equation. If the following expression is satisfied, it means that the radiation dose measuring apparatus 100 is tilted to the left or right, and the process proceeds to S706. If the following equation is not satisfied, it means that the radiation dose measuring apparatus 100 is not tilted to the left or right, and the process proceeds to S709.

X ≠ x
In S706, the measurement method notification unit 42 determines whether or not the radiation dose measuring apparatus 100 is tilted to the right. For example, the measurement method notification unit 42 performs determination on the set value x corresponding to the lateral acceleration X that is the measurement result of the measurement state sensor 41 using the following equation. If the following equation is satisfied, it means that the radiation dose measuring device 100 is tilted to the right. If the following equation is not satisfied, it means that the radiation dose measuring device 100 is tilted to the left. To do.

X> x
If the radiation dose measuring apparatus 100 is tilted to the right, the process proceeds to S707. If the radiation dose measuring apparatus 100 is tilted to the left, the process proceeds to S708.

  In S707, the measurement method notification unit 42 executes an interrupt and issues a notification instruction E to output a notification for instructing to hold the radiation dose measuring apparatus 100 tilted to the left. Thereafter, the process returns to S702.

  In S708, the measurement method notification unit 42 executes an interrupt and issues a notification command F in order to output a notification for instructing to hold the radiation dose measuring apparatus 100 tilted to the right. Thereafter, the process returns to S702.

  In S <b> 709, the measurement method notification unit 42 determines whether or not the radiation dose measuring device 100 is tilted with respect to the front direction based on the measurement result of the measurement state sensor 41. For example, the measurement method notification unit 42 may perform determination on the set value y corresponding to the longitudinal acceleration Y detected by the measurement state sensor 41 using the following equation. If the following expression is satisfied, the radiation dose measuring apparatus 100 is tilted forward, and the process proceeds to S710. If the following equation is not satisfied, the radiation dose measuring apparatus 100 is tilted backward, and the process proceeds to S711.

Y> y
In S710, the measurement method notification unit 42 executes an interrupt and issues a notification command G in order to output a notification for instructing to hold the radiation dose measuring apparatus 100 tilted backward. Thereafter, the process returns to S702.

  In S <b> 711, the measurement method notification unit 42 executes an interrupt and issues a notification command H in order to output a notification for instructing to hold the radiation dose measuring apparatus 100 tilted forward. Thereafter, the process returns to S702.

  Note that the measurement method notifying unit 42 may cause the output unit 5 to output information indicating how much and in which direction it should be tilted and how much it should be tilted together with each notification command. For example, the measurement method notification unit 42 uses the set values x, y, z corresponding to the acceleration X in the left-right direction, the acceleration Y in the front-rear direction, and the acceleration Z in the height direction detected by the measurement state sensor 41, respectively. You may calculate the inclination in the front-rear and left-right directions. Further, the measurement method notifying unit 42 may obtain a tilt correction amount from the tilt in the front / rear / left / right directions (if the tilt is 10 degrees to the right, the correction amount is 10 degrees to the left). The measurement method notification unit 42 outputs the forward / backward / left / right inclination and the correction amount to the calculation control unit 3 together with the notification command so that the calculation control unit 3 can output the information to the output unit 5 together with the operation method. Become. The user will be able to understand more specifically how much tilting should be performed.

<Release from shield>
FIG. 8 is a flowchart showing the operation of the measurement state detection unit 4 in an application example in which the measurement condition is that the sensor surface of the radiation detector 7 is not shielded by an obstacle or the like. The measurement state sensor 41 in this application example can be configured using, for example, a capacitive touch sensor.

  In S801, the measurement method notification unit 42 initializes the measurement state sensor 41 and shifts it to a measurable state.

  In S <b> 802, the measurement method notification unit 42 determines whether the sensor surface (detection surface) is shielded by an obstacle (shield) such as a body or a finger touching the radiation detector 7 that is a sensor that detects radiation. Is determined based on the detection result of the measurement state sensor 41. For example, the change amount E of the electrostatic capacitance detected by the measurement state sensor 41 and the set value e (assumed to be e = 0 here) stored in the measurement condition storage unit 62 are determined using the following equation. Run.

E ≠ 0
If the above formula is satisfied, the sensor surface is shielded by an obstacle, and the process proceeds to S804. On the other hand, if the above equation is not satisfied, the sensor surface is not shielded by the obstacle, and the process proceeds to S805.

  In step S805, the measurement method notification unit 42 executes an interrupt and issues a notification command I to notify that the measurement state is good. Thereafter, the process returns to S802.

  In S806, the measurement method notification unit 42 executes an interrupt and issues a notification command J in order to instruct the sensor surface not to be blocked by an obstacle. Thereafter, the process returns to S802.

<Output contents of output unit 5>
The display notification unit 51 includes the current radiation amount measured by the radiation detection unit 1, the current value of each measurement state detected by the measurement state sensor 41, the difference between the current value and the set value, and an operation instruction for the radiation dose measurement apparatus 100. A notification indicating that the measurement state is appropriate, a set value set as a measurement condition, and the like are displayed. The operation instructions include the above-described rising, lowering, tilting in the front / rear / left / right directions, and releasing the shielding. The display notification unit 51 is configured by a display device such as a liquid crystal display.

  The voice notification unit 52 includes the current radiation dose measured by the radiation detection unit 1, the current value of each measurement state detected by the measurement state sensor 41, the difference between the current value and the set value, and an operation instruction for the radiation dose measurement apparatus 100. This is a mechanism for notifying that a measurement state is appropriate, a set value set as a measurement condition, and the like by voice. The audio notification unit 52 is configured by an audio reproduction module or the like.

  The vibration notification unit 53 is a mechanism that vibrates as an operation instruction, vibrates to notify that the measurement state is appropriate, or vibrates when an operation for setting a measurement condition setting value occurs. . The vibration notification unit 53 is configured by a vibrator or the like.

  When the arithmetic control unit 3 issues a command CW, the power of the display notification unit 51, the voice notification unit 52, and the vibration notification unit 53 is turned on. When the arithmetic control unit 3 issues a command CO, the display notification unit 51 reads and displays the value of the buffer variable R indicating the radiation dose. When the arithmetic control unit 3 issues a command CI, the display notification unit 51 sets the current value of each measurement state, the difference between the current value and the set value, an operation instruction, a notification indicating that the measurement state is appropriate, and the measurement condition setting. Display values.

  Further, when the arithmetic control unit 3 issues a command CO to the voice notification unit 52, the voice notification unit 52 reads the value of the buffer variable R indicating the radiation dose and notifies it by voice. When the arithmetic control unit 3 issues a command CI, the voice notification unit 52 notifies the current value of each measurement state, the difference between the current value and the set value, the operation instruction, the notification indicating that the measurement state is appropriate, and the measurement condition. Notifies the setting value by voice.

  When the arithmetic control unit 3 issues a command CI to the vibration notification unit 53, the vibration notification unit 53 indicates that an operation instruction, a notification indicating that the measurement state is appropriate, and a setting operation for the set value of the measurement condition have occurred. Generate vibration. For example, the vibration may be executed once when it should be raised, and the vibration may be executed twice when it should be lowered.

<Setting measurement conditions>
FIG. 9 is a flowchart showing the operation of the measurement condition setting unit 6. When the arithmetic control unit 3 issues a command CW, the measurement condition input unit 61 and the measurement condition storage unit 62 start to operate.

  In step S901, the measurement condition input unit 61 determines whether a setting start operation has been performed by a key or button operation. When the setting start operation is performed, the process proceeds to S902. When the setting start operation is not performed, the measurement condition input unit 61 repeats the determination process of S901.

  In S <b> 902, the measurement condition input unit 61 reads the set value s <b> 1 stored in the measurement condition storage unit 62 and substitutes it in the buffer variable S.

  In S903, the measurement condition input unit 61 issues a notification command K for notifying the user of the setting value stored in the buffer variable S. When the arithmetic control unit 3 transfers the notification command K to the output unit 5, the output unit 5 reads the buffer variable S and outputs it visually or audibly.

  In S904, the measurement condition input unit 61 changes the set value by substituting the set value s2 changed by the key or button operation into the buffer variable S.

  In step S <b> 905, the measurement condition input unit 61 determines whether a setting confirmation operation is performed by a key or button operation. If a setting confirmation operation has been performed, the process proceeds to S906. If the setting confirmation operation has not been performed, the process returns to S903.

  In S906, the measurement condition input unit 61 stores the set value stored in the buffer variable S in the set value s1 of the measurement condition storage unit 62.

Incidentally, the radiation dose measuring apparatus 100 may include a communication unit that communicates with an external information processing apparatus (computer). Thereby, the radiation dose measuring apparatus 100 can transmit the radiation dose information to the computer. The radiation dose measuring apparatus 100 may store the accumulated value of the exposure dose in a memory backed up by a battery, an EEPROM, or a flash memory (registered trademark). Thereby, the radiation dose measuring apparatus 100 may continuously manage the radiation dose by continuously accumulating the radiation dose.

<Second embodiment>
Hereinafter, a radiation dose measuring apparatus according to a second embodiment of the present invention will be described with reference to the drawings. Here, only the parts different from the first embodiment will be described, thereby simplifying the description of the second embodiment.

  FIG. 10 is a block diagram showing functions provided in the radiation dose measuring apparatus 100 according to the second embodiment of the present invention. Comparing FIG. 1 with FIG. 10, it can be seen that a match level notification unit 43 is added to the measurement state detection unit 4. Other parts are as described in the first embodiment.

  The match level notification unit 43 is a unit that calculates a match level indicating how much the plurality of measurement states measured by the measurement state sensor 41 match the measurement conditions, and causes the output unit 5 to output the match level. The match level notification unit 43 starts the operation based on the command CW from the calculation control unit 3. The match level notification unit 43 compares the plurality of measurement states measured by the measurement state sensor 41 with the measurement conditions stored in the measurement condition storage unit 62, and what percentage of the plurality of measurement states indicates the measurement condition. You may calculate whether it is satisfy | filled as the coincidence level F. FIG. Alternatively, the match level notification unit 43 may count the number of measurement state good notifications issued for each measurement condition, and calculate the count value as the match level F. Thus, the match level F may be a ratio or the number of measurement states that match. The match level notification unit 43 stores the match level F in the buffer variable SF. The match level notification unit 43 issues a notification command L for notifying the match level F. When the arithmetic control unit 3 transfers the notification command L to the output unit 5, the output unit 5 reads the buffer variable SF storing the match level F and outputs it visually or audibly.

  By the way, since the above-described functions of the present embodiment can be realized by a sensor or a logic circuit, a part that can be realized by a logic circuit may be realized by a CPU.

  FIG. 11 is a block diagram of a general microcomputer system. The CPU 60 comprehensively controls each unit and executes necessary arithmetic processing. The ROM 67 is a storage unit that stores a control program and the like. The RAM 68 is a work memory and is a storage unit that stores the above-described buffer variables and the like. The ROM 67 and the RAM 68 function as the measurement condition storage unit 62. The input device 63 is a keyboard, a switch, a touch panel, or the like. The display device 64 displays data such as radiation dose and measurement state, and operation methods. The display device 64 functions as the display notification unit 51 described above. The sound output device 65 is a buzzer that outputs a warning sound, a sound output circuit that outputs sound, a speaker, and the like, and outputs data such as a radiation dose and a measurement state, and an operation method. The voice output device 65 functions as the voice notification unit 52 described above. Vibrator 80 generates vibration and functions as vibration notification unit 53, for example. The counter 66 counts the number of pulses output from the radiation detection unit 1. The counter 66 functions as the pulse accumulation unit 2. Various sensors for detecting the measurement state are connected to the A / D port of the CPU 60 and the like.

  The CPU 60 implements a function that can be executed by a logic circuit among the functions described above by executing a control program. For example, the CPU 60 includes a part that performs logical operations such as determination processing among the calculation control unit 3, the measurement method notification unit 42 of the measurement state detection unit 4, the measurement condition input unit 61 of the measurement condition setting unit 6, and the output unit 5. Realize. The procedures included in the control program executed by the CPU 60 are as shown in the above description and flowchart.

  Although many sensors functioning as the measurement state sensor 41 are shown in FIG. 11, not all of them are essential. It is sufficient that at least one sensor is required to detect the measurement state. In other words, the required sensors vary depending on what the measurement state is and how the sensors are combined. The GPS sensor 71 is a sensor that measures the position of the radiation dose measuring apparatus 100. The acceleration sensor 72 is a sensor that measures acceleration applied to the radiation dose measuring apparatus 100. The acceleration sensor 72 detects a tilt or impact in the front / rear / left / right direction. The distance sensor 73 is a sensor that measures the distance to the measurement target or the ground surface. The direction sensor 74 is a sensor for measuring which direction the radiation dose measuring apparatus 100 is pointing. The altitude sensor 75 is a sensor that measures the altitude of the radiation dose measuring apparatus 100. The wind direction sensor 76 is a sensor that measures the wind direction of the atmosphere (wind) blown to the radiation dose measuring apparatus 100. The air volume sensor 77 is a sensor that measures the air volume of the wind blowing on the radiation dose measuring apparatus 100. The wind speed sensor 78 is a sensor that measures the wind speed of the wind blowing on the radiation dose measuring apparatus 100. The shielding sensor 79 detects whether or not the sensor surface of the radiation detector 1 is shielded by a shielding object.

  Thus, according to the first embodiment and the second embodiment, the measurement state of the radiation dose measuring device is measured, and if the measurement state does not satisfy the predetermined measurement condition, the measurement state of the radiation dose measuring device is changed. You will be notified. Therefore, even a general person who is a non-expert can easily, efficiently, and accurately measure the radiation dose easily.

  Further, the measurement state detection unit 4 and the output unit 5 may notify the difference between the detected measurement state and the stored measurement condition. This makes it easier for the user to understand how much the measurement state deviates from the ideal state.

  The measurement state detection unit 4 and the output unit 5 may notify an operation method for bringing the measurement state closer to the measurement condition. For example, the radiation dose measuring apparatus 100 may be raised, lowered, rotated in the front / rear, up / down, left / right directions, or a specific operation instruction with the shielding object removed may be output. This makes it easier for the user to perform an operation for bringing the measurement state closer to the measurement condition.

  The measurement state detection unit 4 and the output unit 5 determine the distance to the radiation dose measurement device 100 according to the distance from the measurement object or the ground surface to the radiation dose measurement device 100 and the distance threshold value that is the measurement condition. You may output the notification which urges to approach. As a result, the user can easily match the measurement object or the distance from the ground surface to the radiation dose measuring apparatus 100 with the measurement conditions, so that the measurement can be performed more accurately.

  If the radiation dose measuring device 100 is not installed horizontally, the measurement state detection unit 4 and the output unit 5 may output a notification prompting the radiation dose measuring device 100 to be installed horizontally. This makes it easier for the user to install the radiation dose measuring apparatus 100 horizontally.

  The measurement state detection unit 4 may measure the inclination from the horizontal plane in the left-right front-rear direction of the radiation dose measurement apparatus 100. Further, the measurement state detection unit 4 and the output unit 5 may notify which direction of the radiation dose measuring device 100 should be tilted in the left-right and front-rear directions. This makes it easier for the user to know which direction of the radiation dose measuring device 100 should be tilted in the left / right / front / rear direction.

  The measurement state sensor 41 functions as a shielding detection unit that detects whether or not the radiation detector 7 is shielded by an obstacle, and the measurement state detection unit 4 and the output unit 5 have the radiation detector 7 shielded by an obstacle. In such a case, a notification that prompts the radiation detector 7 not to be blocked by an obstacle may be output. As a result, obstacles that may cause erroneous measurement results are removed from the sensor surface of the radiation detector 7, so that a more accurate measurement result can be obtained.

  The measurement state sensor 41 may include a direction detection means such as a magnetic compass that detects the direction in which the radiation dose measurement apparatus 100 is facing. The measurement state detection unit 4 and the output unit 5 may notify the radiation dose measuring device 100 to be directed in a predetermined direction when the direction in which the radiation dose measuring device 100 is facing does not satisfy the measurement condition. Thereby, the user will be able to easily orient the radiation dose measuring apparatus 100 with respect to a predetermined direction.

  The measurement state sensor 41 may include an impact detection unit such as an acceleration sensor that detects an impact applied to the radiation dose measuring apparatus 100. When the impact is detected, the measurement state detection unit 4 and the output unit 5 may output a notification prompting not to apply the impact. This prevents the user from inadvertently impacting the radiation dose measuring apparatus 100. In addition, noise is less likely to occur, and measurement accuracy will be improved.

  The measurement state sensor 41 may detect a plurality of measurement states of the radiation dose measuring apparatus 100. In this case, the measurement state detection unit 4 and the output unit 5 indicate how much the detected plurality of measurement states match the corresponding plurality of measurement conditions stored in the measurement condition storage unit 62. The indicated data may be output. This makes it easier for the user to grasp how much the plurality of measurement conditions are satisfied, and to grasp the accuracy of the measurement result in advance.

Claims (12)

A radiation dose measuring device for measuring radiation dose,
A sensor for measuring radiation dose;
Storage means for storing measurement conditions of the radiation dose measuring device for measuring the radiation dose by the sensor;
Detecting means for detecting a measurement state of the radiation dose measuring device;
Notification means for notifying that the measurement state of the radiation dose measuring device is to be changed when the measurement state detected by the detection means and the measurement condition stored in the storage means do not match. Radiation dose measuring device.   2. The radiation dose measuring apparatus according to claim 1, wherein the notifying unit notifies a difference between a measurement state detected by the detecting unit and a measurement condition stored in the storage unit.   3. The radiation dose measurement according to claim 1, wherein the notification unit notifies an operation method for bringing the measurement state detected by the detection unit closer to the measurement condition stored in the storage unit. apparatus. The detection means has a distance measurement means for measuring a distance from a measurement object or the ground surface to the radiation dose measurement apparatus as a measurement state of the radiation dose measurement apparatus,
The notification means outputs a notification for encouraging the distance to the radiation dose measuring device to approach the distance threshold according to the distance measured by the distance measurement means and the distance threshold that is the measurement condition. The radiation dose measuring apparatus according to claim 3. The detection means has a horizontal measurement means for detecting whether the radiation dose measurement device is installed horizontally as a measurement state of the radiation dose measurement device,
The radiation dose according to claim 3 or 4, wherein the notification means outputs a notification for prompting the radiation dose measuring device to be installed horizontally if the radiation dose measuring device is not installed horizontally. measuring device. The horizontal measuring means measures an inclination from a horizontal plane in the left-right front-rear direction of the radiation dose measuring device,
6. The radiation dose measuring apparatus according to claim 5, wherein the notifying unit notifies which of the left and right and front and rear directions the tilt is to be tilted. The detection means further comprises shielding detection means for detecting whether the sensor is shielded by an obstacle,
7. The notification unit according to claim 3, wherein when the sensor is shielded by an obstacle, the notification unit outputs a notification that prompts the sensor not to be shielded by the obstacle. Radiation dose measuring device. The detection means further comprises a direction detection means for detecting the direction in which the radiation dose measuring device is facing,
The notifying means notifies that the radiation dose measuring device is directed in a predetermined direction when the direction of the radiation dose measuring device detected by the direction detecting device does not satisfy the measurement condition. The radiation dose measuring apparatus according to claim 3, wherein the radiation dose measuring apparatus is characterized in that: The detection means has an impact detection means for detecting an impact applied to the radiation dose measuring device,
4. The radiation dose measuring apparatus according to claim 1, wherein when the impact is detected, the notification unit outputs a notification prompting not to apply the impact. 5.   The said detection means is a means to detect either the altitude of the said radiation dose measuring apparatus, the wind direction with respect to the said radiation dose measuring apparatus, or a wind volume, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The radiation dose measuring device described. The detecting means detects a plurality of measurement states of the radiation dose measuring device;
The notification means outputs data indicating how much the plurality of measurement states detected by the detection means match with the plurality of measurement conditions stored in the storage means correspondingly. The radiation dose measuring apparatus according to claim 1, wherein the radiation dose measuring apparatus is characterized in that:   The radiation dose measuring apparatus according to claim 1, further comprising an input unit that inputs the measurement condition to be stored in the storage unit.