JP2017125711A - Radiation measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely shut off power from a power supply supplied to a radiation measuring apparatus.SOLUTION: A main-power-supply diode 62 and an auxiliary-power-supply diode 70 output a voltage from a main battery 56 or a voltage from an auxiliary battery 66, whichever is higher to a voltage conversion circuit 64. The voltage conversion circuit 64 converts an input voltage and outputs the converted voltage to an information processing unit 54. A voltage determination section 60 detects a voltage of a main-power supply between a main-power-supply wire 59 and a grounded conductor and outputs a determination signal indicating whether a detection value of the voltage of the main-power supply is equal to or less than a termination threshold to a measurement processing section 72 of the information processing unit 54. The measurement processing section 72 executes a safe termination process according to the determination signal. The safe termination process includes a process for terminating an operating system, a process for terminating an application program, a process for completing transfer of data to an internal memory 76 or an external memory 82, a process for stopping operations of a device connected to the measurement processing section 72, and so on.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a radiation measurement apparatus, and more particularly to a technique for cutting off power.

  In recent years, the need for radiation measurement has increased, and monitoring posts have been installed in many places throughout the country. The monitoring post is equipped with an air dose rate meter and measures the air dose rate. The air dose rate indicates the amount of radiation observed per unit time in space. Each monitoring post is communicatively connected to a host computer installed in the management facility, and the air dose rate measured at each monitoring post is collected by the host computer.

  The monitoring post includes a permanent type that is fixed at the measurement location and a portable type that is not fixed at the measurement location. Generally, a battery is used for a portable monitoring post. The battery supplies power to an air dose rate meter and other electrical equipment mounted on the monitoring post. The portable monitoring post is transported to a place where radiation measurement is performed, and the radiation measurement is performed there. The measured air dose rate is stored in a memory detachably attached to the monitoring post. The user removes the memory from the monitoring post and collects the measured values by the computer. Further, when the portable monitoring post has a communication function, the measurement value may be transmitted to the host computer via the communication line.

  The following Patent Documents 1 and 2 describe techniques related to monitoring posts. The monitoring post described in Patent Document 1 detects that a specific radioisotope is approaching based on the energy distribution of the radiation count value. Patent Document 2 describes a technique for moving a measurement point as necessary. Further, as a technique related to radiation dose measurement, Patent Document 3 describes a personal dosimeter. The personal dosimeter measures an exposure dose indicating a radiation dose that a human body receives during a predetermined time.

JP 2005-37304 A JP 7-260938 A JP 2014-137255 A

  In general, in a radiation measuring apparatus such as an air dose rate meter, an operation for turning off a power switch is determined. This end operation is performed by a program executed by the radiation measurement apparatus in accordance with an operation of a button or a keyboard of the radiation measurement apparatus.

  If the power switch is forcibly turned off or the battery is removed before the end operation is completed, the execution of the program is forcibly interrupted. This causes a problem that the program ends abnormally or data being transferred to the memory is lost.

  An object of this invention is to interrupt | block the power supply power supplied to a radiation measuring device safely.

  The present invention provides a selection unit that outputs a higher one of a main power supply voltage in a path from a main power supply and an auxiliary voltage by an auxiliary power supply, and a measurement processing unit that operates based on the voltage output from the selection unit. A voltage determination unit that determines whether or not the main power supply voltage satisfies a predetermined end condition, and the measurement processing unit executes a safe end process when the main power supply voltage satisfies the end condition. The termination condition is a condition that is satisfied when the main power source is not valid.

  When the main power source in the present invention is not effective, for example, the voltage output from the main power source may be lowered or the main power source may be removed from the radiation measuring apparatus. The termination condition in the present invention is a condition that is satisfied when the main power supply is not valid. When the main power supply voltage satisfies the termination condition, since the main power supply is not effective, the auxiliary power supply voltage becomes higher than the main power supply voltage. As a result, the auxiliary voltage is output to the measurement processing unit, and the measurement processing unit executes the safety termination process with the electric power output from the auxiliary power source. Generally, in an apparatus that executes information processing, a predetermined safe termination process is executed when power supply is cut off, thereby avoiding a problem in hardware or software. According to the present invention, when the main power source is not valid, the safety end process is executed, and the problem occurring in the measurement processing unit can be avoided.

  Preferably, the measurement processing unit turns off a switch provided between the auxiliary power source and the selection unit after the safety end processing is completed.

  According to the present invention, it is possible to avoid the consumption of the power of the auxiliary power supply after the safety termination process is completed.

  Preferably, after the measurement processing unit turns off the switch, if the main power supply voltage does not satisfy the termination condition, the measurement processing unit performs start-up processing based on the main power supply voltage output from the selection unit. Run.

  If the main power supply voltage does not satisfy the termination condition after the measurement processing unit turns off the switch, there is a high possibility that the main power supply is enabled again. According to the present invention, when the main power source becomes valid again, the start-up process can be executed by the power from the main power source.

  Preferably, after the switch is turned off, when the main power supply voltage continues to satisfy the termination condition, the measurement processing unit terminates the process to be executed by not supplying power to itself.

  According to the present invention, the process performed by the measurement processing unit is completed when the power for the measurement processing unit is not supplied and the measurement processing unit becomes inoperable, thereby simplifying the processing.

  Desirably, the measurement processing unit performs a startup process based on the main power supply voltage output from the selection unit when the main power supply voltage does not satisfy the end condition after the safety end processing ends. Execute.

  If the main power supply voltage does not satisfy the termination condition after the safety termination processing is completed, there is a high possibility that the main power supply is enabled again. According to the present invention, when the main power source becomes valid again, the start-up process can be executed by the power from the main power source.

Desirably, the safe termination process includes:
Including at least one of a process for terminating the operating system, a process for terminating the application program, a process for completing the transfer of data to the storage unit, and a process for stopping the operation of the apparatus connected to the measurement processing unit .

  According to the present invention, it is possible to avoid the abnormal termination of the operating system or the application program, the loss of data being transferred, or the occurrence of an abnormality in the device connected to the measurement processing unit.

  Desirably, the termination condition is a condition that is equal to or lower than a predetermined threshold value higher than the auxiliary voltage.

  In the present invention, when the main power source voltage decreases and becomes lower than the auxiliary voltage, the auxiliary voltage is output from the selection unit, and the measurement processing unit operates with electric power supplied from the auxiliary power source. If the end condition is set to be equal to or lower than a predetermined threshold value equal to or lower than the auxiliary voltage, the safe end process may not be executed even when the main power supply voltage becomes lower than the auxiliary voltage. In this case, the power of the auxiliary power source is consumed for normal processing that is not safe termination processing. Therefore, in the present invention, the termination condition is a condition that is not more than a predetermined threshold value higher than the auxiliary voltage. As a result, the safety termination process is started before the main power supply voltage becomes lower than the auxiliary voltage. Since the auxiliary power supply only needs to have a power capacity required for the safe termination process, a small auxiliary power supply can be used.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply supplied to a radiation measuring device can be interrupted | blocked safely.

It is a figure which shows a simple electron dosimeter. It is a figure which shows a personal dosimeter, an interface accommodating part, and a holder. It is a figure which shows the structure of a simple electron dosimeter. It is a flowchart of an automatic safety end process. It is a flowchart of an automatic safety end process. It is a figure which shows the structure of a simple electron dosimeter. It is a figure which shows the structure of the system which supplies power supply power to information processing apparatus.

  A simplified electronic dosimeter 10 is shown in FIG. The simplified electronic dosimeter 10 includes a personal dosimeter 12, a main unit 20, a transmission unit 22, and a storage box 14. The storage box 14 includes a main body 16 and a lid 18. The main body 16 has a container shape in which one surface of a substantially rectangular parallelepiped box is opened, and accommodates the personal dosimeter 12, the main body unit 20, and the transmission unit 22. The lid portion 18 is attached to the edge of the opening of the main body portion 16 by a hinge. The lid portion 18 is swingable about a hinge, and covers the opening of the main body portion 16 or opens the opening of the main body portion 16.

  In general, personal dosimeters are used to measure exposure. The exposure dose is defined as the amount of radiation that the human body receives during a given time. In many cases, an air dose rate meter that exclusively measures an air dose rate (μSv / h) is used for the monitoring post. However, in recent years, there has been a growing demand for more monitoring posts or equivalent measuring instruments, and a proposal to use a personal dosimeter with a simple structure and suitable for mass production as a measuring instrument for measuring the air dose rate. Has been made.

  The personal dosimeter 12 is used for measuring the exposure dose and outputting the count value of the radiation detected within a predetermined time. The personal dosimeter 12 outputs the radiation count value to the main unit 20 every predetermined time. The main unit 20 obtains an air dose rate (μSv / h) based on the radiation count value output from the personal dosimeter 12 every predetermined time, and outputs it to the transmission unit 22. The transmission unit 22 includes a wireless communication circuit or a wired communication circuit for connecting to a communication line such as the Internet or a mobile phone network. The transmission unit 22 transmits the air dose rate to the host computer of the management facility via the communication line. The main unit 20 is equipped with a removable external memory, and the main unit 20 stores the measured value of the air dose rate in the external memory. After the measured values are stored, the user removes the external memory and collects the measured values by the computer.

  Since the simplified electronic dosimeter 10 operates with electric power supplied from a battery, it may be used as a portable monitoring post.

  FIG. 2 shows the personal dosimeter 12, the interface accommodating portion 26, and the holder 42. The personal dosimeter 12 has a substantially rectangular parallelepiped case. The front surface of the case is a reference plane for measurement, and the personal dosimeter 12 is configured to be highly sensitive to radiation that comes toward the front surface of the case.

  An attachment mechanism 34 is attached to the personal dosimeter 12. The attachment mechanism 34 includes a left mounting member 38 that contacts the left side surface of the personal dosimeter 12, a right mounting member 36 that contacts the right side surface of the personal dosimeter 12, and a clip that connects the left mounting member 38 and the right mounting member 36. A member 40 is provided. The clip member 40 has a U-shape, protrudes forward from the left mounting member 38 and extends downward while being bent, then bends rightward, extends to the width of the personal dosimeter 12, and protrudes forward and bends. However, it extends upward and reaches the right mounting member 36. The attachment mechanism 34 is attached to the personal dosimeter 12 such that the left mounting member 38 and the right mounting member 36 sandwich the personal dosimeter 12. The attachment mechanism 34 may be made detachable from the personal dosimeter 12 by forming the attachment mechanism 34 from a resilient material such as plastic resin. As described in Patent Document 3, the attachment mechanism 34 has a function as a clip for fixing the personal dosimeter 12 stored in the pocket of the user's clothes to the pocket. Further, the left and right front bent portions formed in the clip member 40 have a function as a buffer member that softens the impact from the front. However, in this embodiment, the personal dosimeter 12 is used as a measuring instrument for measuring the air dose rate.

  The personal dosimeter 12 is fixed to the holder 42 with the attachment mechanism 34 attached. An interface housing portion 26 is located behind the personal dosimeter 12. The interface accommodating portion 26 is formed in a box shape that is integrated with the holder 42 and opened at the lower side, for example, by a metal plate. A right flange 28 extending in the right direction is formed at the rear end of the right side surface of the interface housing portion 26. A left flange 30 that extends in the left direction is formed at the rear end of the left side surface of the interface housing portion 26. The right flange 28 and the left flange 30 are provided with screw holes, and the right flange 28 and the left flange 30 are fixed to the storage box by screws passed through the screw holes, and the interface storage portion 26 is fixed to the storage box. .

  On the back of the personal dosimeter 12, an infrared transmitter / receiver that transmits and receives infrared rays is provided. The front plate 32 of the interface housing portion 26 has a hole for allowing infrared rays to pass through. An infrared communication interface that transmits and receives infrared rays is provided inside the interface housing portion 26. The infrared communication interface receives the infrared rays transmitted from the personal dosimeter 12, and outputs information extracted from the infrared rays to the internal circuit of the main unit. The infrared communication interface includes information output from the internal circuit of the main unit in the infrared rays and transmits the infrared rays to the personal dosimeter 12. Thereby, an information transmission path between the personal dosimeter 12 and the main unit is formed.

  The front plate 32 extends downward, and a holder 42 that holds the personal dosimeter 12 is formed at the lower front side of the interface housing portion 26. The holder 42 includes a support plate 44 that extends forward from the lower end of the front plate 32 and supports the personal dosimeter 12, and a guide plate 46 that extends forward from the left side of the front plate 32 and holds the personal dosimeter 12. A mechanism for fixing the personal dosimeter 12 to the holder 42 is provided on the right side of the personal dosimeter 12.

  FIG. 3 shows the configuration of the simplified electron dosimeter 10. The simplified electronic dosimeter 10 includes a main battery 56, a power supply unit 52, an information processing unit 54, an external memory 82, a transmission unit 22, and a personal dosimeter 12. The power supply unit 52 and the information processing unit 54 are included in the main unit 20 shown in FIG.

  The power supply unit 52 converts the voltage output from the main battery 56 and outputs the converted voltages to the information processing unit 54 and the transmission unit 22. The information processing unit 54 and the transmission unit 22 operate with electric power output from the power supply unit 52. The personal dosimeter 12 has its own battery and operates with electric power output from its own battery.

  The information processing unit 54 includes a measurement processing unit 72, an infrared communication interface 74, an internal memory 76, an operation unit 78, and a display unit 80.

  The measurement processing unit 72 includes an arithmetic processing device such as a processor. The internal memory 76 stores a program executed by the measurement processing unit 72. The measurement processing unit 72 executes a program stored in the internal memory 76 and executes a process for radiation measurement. The internal memory 76 may store a measurement value of the air dose rate.

  The operation unit 78 includes a touch panel, a keyboard, a switch, a dial, and the like, and gives a command to the measurement processing unit 72 according to a user operation. The display unit 80 is configured by a display device, for example, and displays information output from the measurement processing unit 72. For example, the measurement processing unit 72 causes the display unit 80 to display guidance for the user to operate the operation unit 78, information stored in the internal memory 76 and the external memory 82, and the like.

  The infrared communication interface 74 receives infrared rays transmitted from the personal dosimeter 12, extracts information from the infrared rays, and outputs the information to the measurement processing unit 72. In addition, the infrared communication interface 74 includes the information output from the measurement processing unit 72 in infrared rays, and transmits the infrared rays to the personal dosimeter 12.

  The personal dosimeter 12 transmits the count value of the radiation detected within a predetermined time to the measurement processing unit 72 every predetermined time. The measurement processing unit 72 obtains an air dose rate (μSv / h) based on the radiation count value transmitted from the personal dosimeter 12 every predetermined time.

  An external memory 82 is connected to the information processing unit 54. For example, a USB memory, an SD card, or the like is used as the external memory 82, and the external memory 82 is detachable from the information processing unit 54 as necessary. The measurement processing unit 72 stores the measurement value of the air dose rate in the internal memory 76 or the external memory 82.

  The transmission unit 22 connects the measurement processing unit 72 to a communication line. As a result, the measurement processing unit 72 is communicatively connected to the host computer of the management facility via the transmission unit 22 and the communication line. The measurement processing unit 72 reads the measured value of the air dose rate from the internal memory 76 or the external memory 82 and transmits it to the host computer.

  The power supply unit 52 includes a main power switch 58, a voltage determination unit 60, a main power diode 62, an auxiliary power diode 70, an auxiliary power switch 68, an auxiliary battery 66, and a voltage conversion circuit 64.

  The negative terminal of the main battery 56 is connected to the ground conductor, and the positive terminal is connected to one end of the main power switch 58. The other end of the main power switch 58 is connected to the anode terminal of the main power diode 62, and the cathode terminal of the main power diode 62 is connected to the input terminal of the voltage conversion circuit 64. The main power switch 58 is turned on and off by a user's manual operation.

  The voltage determination unit 60 is connected between the main power supply conductor 59 that connects the main power switch 58 and the main power diode 62 and the ground conductor. The voltage determination unit 60 detects the main power supply voltage between the main power supply conductor 59 and the ground conductor, and outputs a determination signal corresponding to the main power supply voltage detection value to the measurement processing unit 72. That is, the voltage determination unit 60 sets the value of the determination signal to a low voltage or 0 (off) when the main power supply voltage detection value exceeds an end threshold described later, and when the main power supply voltage detection value is equal to or less than the end threshold. Set the signal value to high voltage (ON). Alternatively, the voltage determination unit 60 sets the value of the determination signal to a high voltage when the main power supply voltage detection value exceeds the end threshold, and sets the signal value to a low voltage or a voltage when the main power supply voltage detection value is equal to or less than the end threshold. It may be 0.

  The minus terminal of the auxiliary battery 66 is connected to the ground conductor, and the plus terminal is connected to one end of the auxiliary power switch 68. The other end of the auxiliary power switch 68 is connected to the anode terminal of the auxiliary power diode 70, and the cathode terminal of the auxiliary power diode 70 is connected to the input terminal of the voltage conversion circuit 64. The auxiliary power switch 68 is on / off controlled by the measurement processing unit 72.

  The specified range of the output voltage of the main battery 56 is set to a value range that is larger than the upper limit value of the specified range of the output voltage of the auxiliary battery 66. Therefore, when the output voltages of main battery 56 and auxiliary battery 66 are within the specified range, the output voltage of main battery 56 is higher than the output voltage of auxiliary battery 66.

  The cathode terminals of the main power supply diode 62 and the auxiliary power supply diode 70 are connected in common to the input terminal of the voltage conversion circuit 64. When the voltage between the anode terminal of the main power supply diode 62 and the ground conductor is larger than the voltage between the anode terminal of the auxiliary power supply diode 70 and the ground conductor, the main power diode 62 becomes forward biased and becomes conductive. The auxiliary power supply diode 70 becomes reverse biased and becomes non-conductive. In this case, the voltage of the anode terminal of the main power supply diode 62 is applied to the input terminal of the voltage conversion circuit 64.

  Conversely, when the voltage between the anode terminal of the main power supply diode 62 and the ground conductor is smaller than the voltage between the anode terminal of the auxiliary power supply diode 70 and the ground conductor, the main power supply diode 62 is in a reverse bias state. Thus, the auxiliary power supply diode 70 becomes a forward bias state and becomes conductive. In this case, the voltage of the anode terminal of the auxiliary power supply diode 70 is applied to the input terminal of the voltage conversion circuit 64.

  A normal operation in which each output voltage of the main battery 56 and the auxiliary battery 66 is a value within a specified range and both the main power switch 58 and the auxiliary power switch 68 are on will be described. The output voltage of the main battery 56 is applied to the anode terminal of the main power supply diode 62, and the output voltage of the auxiliary battery 66 is applied to the anode terminal of the auxiliary power supply diode 70. In normal times, the output voltage of the main battery 56 is higher than the output voltage of the auxiliary battery 66. Therefore, main power supply diode 62 is turned on and auxiliary power supply diode 70 is turned off. As a result, the output voltage of the main battery 56 is applied to the input terminal of the voltage conversion circuit 64.

  The voltage conversion circuit 64 converts the input voltage applied to the input terminal into a plurality of different voltages. The voltage conversion circuit 64 outputs each voltage to each internal circuit included in the information processing unit 54. Depending on the circuit configuration of the information processing unit 54, one type of voltage may be output from the voltage conversion circuit 64. The voltage conversion circuit 64 converts the input voltage into a voltage for operating the transmission unit 22, and outputs the converted voltage to the transmission unit 22.

  An operation for turning off the main power switch 58 will be described. In the information processing unit 54, when the power supplied from the power supply unit 52 is suddenly cut off while the measurement processing unit 72 is performing any operation, an electrical load is applied to the hardware of the information processing unit 54. Sometimes. In addition, the operating system or application program started by the measurement processing unit 72 may not end normally, or data being transferred to the internal memory 76 or the external memory 82 may be lost.

  Therefore, in the simplified electronic dosimeter 10, an end operation for turning off the main power switch 58 is determined, and the measurement processing unit 72 executes a safety end process in accordance with the user's end operation in the operation unit 78. To do. The safe termination process includes, for example, a process of normally terminating the operating system in which the measurement processing unit 72 is activated. In addition, the safe end process includes, for example, a process for normally terminating the application program being executed by the measurement processing unit 72. Here, normal termination refers to something that is not abnormal termination. The abnormal termination means, for example, that the operating system, application program, or the like is terminated in a state where the next activation is impossible or an operation check is required at the next activation. The safe termination process may include a process of completing the transfer of data being transferred to the internal memory 76 or the external memory 82 as a storage unit. Further, the safe end process may include a process of stopping the operation when the external memory 82 or another device connected to the measurement processing unit 72 is performing a predetermined operation.

  The user can turn off the main power switch 58 after the safety termination process is completed. Alternatively, the battery may be removed without operating the main power switch 58.

  Such an end operation ensures safety when the main power switch 58 is turned off. However, the user of the simplified electronic dosimeter 10 is not necessarily an expert who uses the simplified electronic dosimeter 10 at a high frequency, and does not perform complicated operations up to simple operations such as turning off the main power switch 58. It is not realistic to require all users. Further, the main battery 56 may be removed due to mishandling or the like. Furthermore, the amount of stored charge in the main battery 56 may decrease, and the output voltage may decrease.

  Therefore, in the simplified electronic dosimeter 10, the voltage determination unit 60 determines whether or not the main power supply voltage detection value is equal to or less than a predetermined end threshold. Then, when the main power supply voltage detection value becomes equal to or less than the end threshold value, the measurement processing unit 72 executes the safety end process (automatic safety end process) by itself. The end threshold value is set to a value exceeding the upper limit value of the specified range of the auxiliary battery output voltage and less than the lower limit value of the specified range of the main battery output voltage.

  When the voltage of the main power supply lead 59 decreases and the main power supply voltage detection value is equal to or less than the end threshold value, the measurement processing unit 72 executes an automatic safety end process. For example, when the main power switch 58 is turned off without performing an end operation using the operation unit 78, or when the main battery 56 is removed while the main power switch 58 is on, the main power switch Since the voltage detection value decreases, the measurement processing unit 72 executes automatic safety end processing. Further, since the main power supply voltage detection value also decreases due to a decrease in the output voltage of the main battery 56, the measurement processing unit 72 executes an automatic safety end process.

  As a result, when the main power switch 58 is turned off without the termination operation being performed, the main battery 56 is removed, or the output voltage of the main battery 56 becomes equal to or less than the termination threshold. In this case, hardware or software abnormality in the information processing unit 54 is avoided. In addition, when the main battery 56 is connected to the simplified electronic dosimeter 10 at the transport destination and the main power switch 58 is turned on, the operation check of the operating system is not performed, so that the start of radiation measurement is quick. .

  When the decrease in the main power supply voltage detection value is due to the main power switch 58 being turned off or the main battery 56 being removed, power is supplied from the auxiliary battery 66 to the information processing unit 54 in the automatic safety termination process. That is, the voltage at the anode terminal of the main power supply diode 62 becomes lower than the voltage at the anode terminal of the auxiliary power supply diode 70, and power is supplied from the auxiliary battery 66 to the information processing unit 54 via the auxiliary power supply diode 70 and the voltage conversion circuit 64. Is supplied.

  On the other hand, when the decrease in the main power supply voltage detection value is due to the decrease in the output voltage of the main battery 56, when the output voltage of the main battery 56 is higher than the output voltage of the auxiliary battery 66, the main battery 56 to the information processing unit. Power is supplied to 54. That is, even if the main power supply voltage detection value is equal to or lower than the end threshold, the voltage of the anode terminal of the main power supply diode 62 is higher than the voltage of the anode terminal of the auxiliary power supply diode 70. Therefore, power supply power is supplied from the main battery 56 to the information processing unit 54 via the main power supply diode 62 and the voltage conversion circuit 64.

  Further, when the output voltage of the main battery 56 is lower than the output voltage of the auxiliary battery 66, power is supplied from the auxiliary battery 66 to the information processing unit 54. That is, when the main power supply voltage detection value is equal to or lower than the end threshold, the voltage of the anode terminal of the main power supply diode 62 becomes lower than the voltage of the anode terminal of the auxiliary power supply diode 70, and the auxiliary power supply diode 70 is supplied from the auxiliary battery 66. The power supply power is supplied to the information processing unit 54 via the voltage conversion circuit 64.

  Thus, the main power supply diode 62 and the auxiliary power supply diode 70 output the higher voltage of the voltage from the main battery 56 as the main power supply and the voltage from the auxiliary battery 66 as the auxiliary power supply to the voltage conversion circuit 64. It has a function as a selection unit.

  FIG. 4 shows a flowchart of the automatic safety end process. The flowchart of FIG. 4 will be described with reference to FIG. 3 as appropriate. First, the measurement processing unit 72 executes a startup process in response to a command from the operation unit 78 (S101). The activation process includes activation of an operating system, activation of an application program for radiation measurement, activation of a device driver for controlling the auxiliary power switch 68, and the like. The measurement processing unit 72 executes normal processing for radiation measurement in parallel with the processing shown in this flowchart until the safety end processing (S104) is executed after executing the startup processing. The measurement processing unit 72 executes the startup process (S101), and then turns on the auxiliary power switch 68 (S102).

  The measurement processing unit 72 acquires a determination signal from the voltage determination unit 60, and determines whether or not the main power supply voltage detection value is equal to or less than the end threshold (S103). If the main power supply voltage detection value exceeds the end threshold value, the measurement processing unit 72 makes the determination in step 103 again. When the main power supply voltage detection value is equal to or less than the end threshold value, the measurement processing unit 72 executes the above-described safety end process (S104). As a result, the measurement processing unit 72 repeats the determination in step 103 until the main power supply voltage detection value is equal to or lower than the end threshold value, and executes the safe end process when the main power supply voltage detection value is equal to or lower than the end threshold value. The measurement processing unit 72 turns off the auxiliary power switch 68 after the safety end processing is completed (S105).

  The measurement processing unit 72 acquires a determination signal from the voltage determination unit 60, and determines whether or not the main power supply voltage detection value exceeds the end threshold (S106). If the main power supply voltage detection value exceeds the end threshold, the measurement processing unit 72 returns to step S101 and executes the startup process again. On the other hand, when the main power supply voltage detection value is less than or equal to the end threshold, the measurement processing unit 72 ends the automatic safety end process.

  Since the auxiliary power switch 68 is turned off in step S105, as will be described later, when the main power supply voltage detection value is equal to or lower than the end threshold, power is not supplied to the measurement processing unit 72, and the measurement processing unit 72 may become inoperable. In this case, in step S106, the fact that the measurement processing unit 72 has become inoperable is the determination itself that the main power supply voltage detection value is equal to or less than the end threshold value, and the automatic safety end process ends.

  According to step S103 and step S104, the safe termination process is executed when the main power supply voltage detection value is equal to or less than the termination threshold value. As a result, when the main power switch 58 is turned off without executing the end operation, the main battery 56 is removed, or when the output voltage of the main battery 56 becomes equal to or lower than the end threshold. The hardware or software abnormality in the information processing unit 54 is avoided.

  Further, according to step S105, after the safety end process is ended, the auxiliary power switch 68 is turned off. As a result, a minute current flows from the auxiliary battery 66 to the voltage conversion circuit 64 via the auxiliary power supply diode 70, thereby avoiding the consumption of the electric power stored in the auxiliary battery 66.

  The technical significance of determining that the main power supply voltage detection value has exceeded the end threshold value in step S106 is as follows. Step S106 is performed after it is determined that the main power supply voltage detection value is less than or equal to the end threshold, and further after the auxiliary power switch 68 is turned off (S103 to S105). Therefore, the power from the main battery 56 is cut off, and further, the power from the main battery 56 is likely to be supplied again after the power from the auxiliary battery 66 is cut off. Such a change in state occurs when the main power switch 58 is turned off without the user's closing operation and then immediately turned on, or after the user removes the main battery 56, the main battery 56 is immediately attached. Can occur if

  Thus, when the power supplied from the main battery 56 is restored, the measurement processing unit 72 performs the determination in step S <b> 106 based on the power supplied from the main battery 56. On the other hand, if the power supplied from the main battery 56 remains unrecovered, no power is supplied to the measurement processing unit 72, and the measurement processing unit 72 becomes inoperable. Therefore, the fact that the measurement processing unit 72 has become inoperable is the determination itself that the main power supply voltage detection value is equal to or less than the end threshold value, and the automatic safety end process ends.

  Note that step S106 may be executed between step S104 and step S105. FIG. 5 shows a flowchart in this case. The same processes as those shown in FIG. 4 are denoted by the same reference numerals and description thereof is omitted.

  After the safety end process (S104) is completed, the measurement processing unit 72 acquires a determination signal from the voltage determination unit 60, and determines whether or not the main power supply voltage detection value exceeds the end threshold (S201). If the main power supply voltage detection value exceeds the end threshold value, the measurement processing unit 72 executes the activation process again (S202), and returns to the process of step S103. On the other hand, when the main power supply voltage detection value is equal to or smaller than the end threshold, the auxiliary power switch 68 is turned off (S105), and the automatic safety end process is ended.

  The measurement processing unit 72 performs the determination in step S201 based on the power supplied from the auxiliary battery 66 or the power supplied from the main battery 56. That is, when the power supplied from the main battery 56 is cut off and does not recover, the measurement processing unit 72 performs the determination in step S201 based on the power supplied from the auxiliary battery 66. On the other hand, when the power supplied from the main battery 56 is cut off and then restored until step S201 is executed, the measurement processing unit 72 uses the power supplied from the main battery 56 to perform step S201. Judgment is made. When the power supplied from the main battery 56 is restored, the measurement processing unit 72 executes a startup process (S202).

  Also by the process shown in FIG. 5, the same effect as the process shown in FIG. 4 can be obtained. In addition, when the power supplied from the main battery 56 is restored, it is not necessary to turn off the auxiliary power switch 68 and then turn it off again. Therefore, the process of controlling the auxiliary power switch 68 is simplified. .

  In the above description, the embodiment using a battery as an auxiliary power source for automatic safety termination processing has been described. A capacitor may be used as an auxiliary power source. FIG. 6 shows the configuration of a simplified electronic dosimeter 84 in that case. The same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted. In the simplified electron dosimeter 84, the auxiliary battery 66 of the simplified electron dosimeter 10 is replaced with a capacitor 86, and the auxiliary power supply diode 70 is short-circuited.

  The measurement processing unit 72 executes automatic safety end processing according to the flowchart shown in FIG. In step S102, the auxiliary power switch 68 is turned on, whereby the capacitor 86 is charged via the main power diode 62, and the charging voltage of the capacitor 86 reaches the output voltage of the main battery 56. In the safety end process of step S104, the power source power is supplied to the information processing unit 54 as follows.

  When the decrease in the main power supply voltage detection value is due to the main power switch 58 being turned off or the main battery 56 being removed, power is supplied from the capacitor 86 to the information processing unit 54 in the automatic safety termination process. That is, the main power supply diode 62 is turned off, and power is supplied from the capacitor 86 to the information processing unit 54 via the voltage conversion circuit 64.

  On the other hand, when the decrease in the main power supply voltage detection value is due to the decrease in the output voltage of the main battery 56, when the output voltage of the main battery 56 is equal to or higher than the charging voltage of the capacitor 86, the information processing unit is connected from the main battery 56. Power is supplied to 54. That is, the main power supply diode 62 is turned on, and power is supplied from the main battery 56 to the information processing unit 54 via the main power supply diode 62 and the voltage conversion circuit 64.

  Further, in the case where the decrease in the main power supply voltage detection value is due to the decrease in the output voltage of the main battery 56, when the output voltage of the main battery 56 is lower than the charging voltage of the capacitor 86, the information is transferred from the capacitor 86 to the information processing unit 54. Power is supplied. That is, the main power supply diode 62 becomes non-conductive, the capacitor 86 discharges the electric charge to the voltage conversion circuit 64, and the power is supplied from the capacitor 86 to the information processing unit 54 via the voltage conversion circuit 64.

  Thus, the higher voltage of the output voltage of the main battery 56 and the charging voltage of the capacitor 86 is output to the voltage conversion circuit 64 by the rectifying action of the main power supply diode 62. The main power supply diode 62 has a function as a selection unit that outputs a higher one of the voltage from the main battery 56 as the main power supply and the voltage from the capacitor 86 as the auxiliary power supply.

  Also for the simplified electronic dosimeter 84, step S106 may be executed between step S104 and step S105. That is, the measurement processing unit 72 may execute processing according to the flowchart shown in FIG.

  In the simplified electron dosimeter 84 shown in FIG. 6, a capacitor 86 is used as an auxiliary power source. Therefore, unlike the case where the auxiliary battery 66 is used, there is no need for replacement due to a voltage drop. Further, since the auxiliary power supply diode 70 is not used, the number of parts is reduced. Note that a secondary battery such as a lithium ion battery or a nickel cadmium battery may be used instead of the capacitor.

  In the above, the embodiment using the main battery 56 as the main power source has been described. By using the main battery 56, it becomes easy to make the simple electronic dosimeter portable. On the other hand, when the simple electronic dosimeter is a permanent type, a commercial power source may be used as the main power source. In this case, a stabilized power supply device is used instead of the main battery 56. The stabilized power supply device is connected to an outlet of a commercial power supply, and steps down an AC voltage output from the outlet and converts it to a DC voltage. In addition to the information processing unit 54 and the transmission unit 22, power may be supplied from the power supply unit 52 to the personal dosimeter 12. When power supplied from the stabilized power supply to the simplified electronic dosimeter is cut off due to a power failure or the like, an automatic safety termination process is executed.

  In the above description, the embodiment in which the personal dosimeter is used as the measuring device for measuring the air dose rate has been described. In addition to using an individual dosimeter as described above, an air dose rate meter exclusively for measuring the air dose rate may be used.

  The power supply unit 52 can be used for various apparatuses equipped with information processing devices such as medical equipment and industrial machines, in addition to a radiation measuring apparatus such as a simple electronic dosimeter. FIG. 7 shows a configuration of a system 88 that supplies power to the information processing apparatus 90. The same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

  The voltage conversion circuit 64 outputs a voltage to the information processing apparatus 90. The information processing apparatus 90 includes an information processing device 92 that executes a program stored in the internal memory 76. Various devices controlled by the information processing device 92 may be connected to the information processing device 92.

  The information processing device 92 executes automatic safety end processing according to the flowchart of FIG. 4 or FIG. That is, the information processing device 92 acquires a determination signal from the voltage determination unit 60, and executes a safe end process according to the main power supply voltage detection value. The information processing device 92 turns on or off the auxiliary power switch 68 under a predetermined condition defined in the flowchart of FIG. 4 or FIG.

  In the system 88 shown in FIG. 7, a capacitor or a secondary battery may be used instead of the auxiliary battery 66 as an auxiliary power source.

  10,84 Simplified electronic dosimeter, 12 Personal dosimeter, 14 Housing box, 16 Main body, 18 Lid, 20 Main body unit, 22 Transmission unit, 26 Interface housing, 28 Right flange, 30 Left flange, 32 Front plate , 34 Attachment mechanism, 36 Right mounting member, 38 Left mounting member, 40 Clip member, 42 Holder, 44 Support plate, 46 Guide plate, 52 Power supply unit, 54 Information processing unit, 56 Main battery, 58 Main power switch, 60 Voltage Determination unit, 62 Main power supply diode, 64 Voltage conversion circuit, 66 Auxiliary battery, 68 Auxiliary power switch, 70 Auxiliary power supply diode, 72 Measurement processing unit, 74 Infrared communication interface, 76 Internal memory, 78 Operation unit, 80 Display unit, 82 External memory, 86 capacitor, 88 System for supplying source power to the broadcasting processing apparatus, 90 an information processing apparatus, 92 an information processing device.

Claims (7)

A selection unit that outputs the higher one of the main power supply voltage in the path from the main power supply and the auxiliary voltage by the auxiliary power supply,
A measurement processing unit that operates based on a voltage output from the selection unit;
A voltage determination unit that determines whether or not the main power supply voltage satisfies a predetermined termination condition,
The measurement processing unit performs a safe termination process when the main power supply voltage satisfies the termination condition,
The radiation measuring apparatus according to claim 1, wherein the termination condition is a condition that is satisfied when the main power source is not valid. The radiation measurement apparatus according to claim 1,
The measurement processing unit turns off a switch provided between the auxiliary power source and the selection unit after the safety termination process is completed. The radiation measurement apparatus according to claim 2,
The measurement processing unit
After the switch is turned off, if the main power supply voltage does not satisfy the termination condition, the radiation measurement is performed based on the main power supply voltage output from the selection unit apparatus. In the radiation measuring device according to claim 2 or 3,
The measurement processing unit
After the switch is turned off, when the main power supply voltage continues to satisfy the termination condition, the radiation measurement apparatus terminates the process to be executed by itself without being supplied with power supply power. The radiation measurement apparatus according to claim 1,
When the main power supply voltage does not satisfy the termination condition after the safety termination process is completed, the measurement processing unit executes a startup process based on the main power supply voltage output from the selection unit. A radiation measuring apparatus characterized by that. The radiation measurement apparatus according to any one of claims 1 to 5,
The safe termination process is:
Including at least one of a process for terminating the operating system, a process for terminating the application program, a process for completing the transfer of data to the storage unit, and a process for stopping the operation of the apparatus connected to the measurement processing unit A radiation measuring apparatus characterized by that. The radiation measurement apparatus according to any one of claims 1 to 6,
The termination condition is
The radiation measuring apparatus is characterized in that the condition is a predetermined threshold value that is higher than the auxiliary voltage.