JP4768306B2 - Radiation dosimeter - Google Patents

Description

  The present invention measures a cumulative dose of radiation emitted from a radiation source including X-rays and γ-rays, and outputs a signal for stopping radiation emission from the radiation source when the cumulative dose reaches a predetermined value. It relates to the radiation dosimeter to be generated.

A conventional radiation dosimeter is incorporated in a “blood bag radiation irradiation device” described in, for example, [Patent Document 1].
The radiation irradiation apparatus for blood bags described in the above [Patent Document 1] includes a turntable capable of mounting a plurality of blood bags side by side and capable of reversing the upper and lower surfaces while maintaining their mutual positional relationship. A radiation source for irradiating the blood bag on the placement surface from above or below the blood bag placement surface of the table, and radiation to a plurality of blood bags on the turntable from the radiation source while rotating the turntable When the predetermined irradiation dose corresponding to the set total radiation dose to the plurality of blood bags is reached, the upper and lower surfaces of the turntable are reversed and the turntable is rotated again while rotating the turntable to A dose distribution in the thickness direction of the blood bag without reducing processing capacity And to reduce the cost of the device.
Japanese Patent Laid-Open No. 10-274699

In the above [Patent Document 1], when an unexpected situation such as a power failure occurs in the middle of irradiation, no consideration has been given for effective use without discarding the object that was in the middle of irradiation.
For example, since it is not possible to confirm the exact irradiation dose applied to a blood bag containing blood for transfusion, it is not known whether the blood in the bag is suitable for use in blood transfusion. Had to be discarded. For this reason, it was not possible to meet the demand for effective use of precious transfused blood.
Further, in the above [Patent Document 1], no consideration is given to a function that is convenient for managing the irradiation history of a large number of times over a long period of time, and it is the actual situation that the irradiation conditions and the like are written and recorded for each irradiation. The request for easy management of history was not met.

  The object of the present invention is to provide a radiation dosimeter capable of continuing radiation irradiation with an acceptable accuracy upon recovery from a situation such as a power failure in the middle of irradiation, and for a long period of time, a number of irradiation histories It is to provide a radiation dosimeter having an irradiation history storage function that is convenient for managing the radiation dose.

The object is provided with means for detecting radiation, means for measuring and integrating the radiation at a predetermined period, and means for holding accumulated data accumulated by the integrating means even when the power supply of the apparatus is shut off. In the radiation dosimeter, at least one of the radiation integrated value measured and integrated at the predetermined cycle, or the dose value information calculated from the predetermined cycle information and the dose rate information measured at the predetermined cycle, at the predetermined cycle. This is achieved by providing control means for recording in the holding means.
Specifically, means for detecting radiation and converting it into a radiation-equivalent electrical signal, means for measuring the electrical signal at a predetermined period and integrating it after conversion into a radiation value, measurement start date and time information and the predetermined period Means for obtaining measurement time information, means for setting information (RESET information) indicating that irradiation has been completed normally after irradiating a predetermined radiation dose, and the integrated radiation dose, measurement start date / time information, predetermined cycle Measurement time information at the time-A means for storing two sets of information (RESET information) indicating that irradiation has been completed normally after irradiating a predetermined dose in the storage means, and specifying the necessary range of the stored information This is achieved by enabling the output of specified range information to a personal computer or the like (hereinafter abbreviated as PC or the like).

In the radiation dosimeter of the present invention, even if an unexpected situation such as a power outage occurs during irradiation, the irradiation history so far is stored, so that the accuracy that can be tolerated when returning from an unexpected situation such as a power outage You can continue irradiation with radiation. Therefore, it is possible to eliminate discarding valuable blood transfusion blood.
In addition, the irradiation calendar for a long period of time is stored in the dosimeter body, and from the stored irradiation calendar, the irradiation calendar in the necessary range is displayed or output to a PC etc. History management can be facilitated.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram showing a schematic configuration of an X-ray irradiation system combined with a radiation dosimeter according to the present invention.
The X-ray irradiation system can detect X-rays equivalent to the X-ray tube device 1, the irradiation object 2 arranged in the X-ray irradiation direction from the X-ray tube device 1, and the irradiation dose to the object 2 Ion chamber type probe (hereinafter abbreviated as probe) 3, radiation dosimeter main body (hereinafter abbreviated as dosimeter) 4, X-ray irradiation device 5, data cable 6, high voltage cable 7, printer 8, a USB converter 9, and an irradiation record output PC 10 or the like.
The X-ray tube apparatus 1 generates X-rays when a high voltage is supplied from the X-ray irradiation apparatus body 5 through the high-voltage cable 7. The probe 3 generates an ionization current when irradiated with X-rays. The dosimeter body 4 includes a touch panel (hereinafter abbreviated as TP) 401 that accepts measurement dose display and operation commands, a computing unit (hereinafter abbreviated as CPU) 402 that controls the whole, a ROM 403 that stores a program of the CPU 402, and individual Serial communication IF404 to output the irradiation data to the printer 6 in RS232 format, RAM405 for storing calculation process data, RAM for storing calibration constants and TRIP values of dosimeters, with built-in calendar clock In order to supply the reference voltage to the SRAM 406 and the high voltage generator 409 for the probe 3 configured to continue to hold the data while the power of the dosimeter is cut off by the battery 407. A digital / analog converter (hereinafter abbreviated as DAC) 408 is incorporated. The output of the high voltage generator 409 generates a predetermined high voltage, for example, 300 V, by changing the analog output of the DAC 408.

The preamplifier 410 amplifies the weak ionization current from the probe 3. The integration resistor 411 includes an operational amplifier (hereinafter abbreviated as OP AMP) 412, an integration capacitor 413, and a resistor 414 to form an integration circuit. Relay contact 415 is driven in accordance with a command from CPU 402, and its coil is not shown. If the relay contact 415 is closed, the integrating capacitor 413 is discharged, so that the function of the integrating circuit can be stopped.
An analog multiplexer (hereinafter abbreviated as MPX) 416 switches between the output of the integration circuit and a high voltage equivalent signal obtained by dividing the high voltage to the probe 3 by resistors 418 and 419 to an AD converter 417 (hereinafter abbreviated as ADC). input.

The X-ray irradiation apparatus main body 5 incorporates a sequencer (hereinafter abbreviated as SQ) 51 that controls the entire apparatus and a touch panel (hereinafter abbreviated as TP) 52 that sets and displays irradiation X-ray conditions and the like. The data cable 6 exchanges control data between the SQ 51 and the CPU 402. The high voltage cable 7 supplies a high voltage from the X-ray irradiation device 5 to the X-ray tube device 12. The printer 8 prints irradiation data by inputting a print command from TP401 or TP52 for each irradiation. The USB converter 9 converts the irradiation history from the dosimeter 4 for a long period, for example, half a year, into a data format that can be handled easily by a PC 10 or the like. The PC 10 receives the irradiation records and manages them with spreadsheet software installed on the PC 10.
Normally, the X-ray tube device 1, the irradiation object 2, and the probe 3 are built in the X-ray irradiation device main body 5, but are illustrated independently as shown in FIG. 1 for ease of explanation. .

  FIG. 2 shows an outline of a control main program flowchart of the dosimeter 4 according to the present invention, and each necessary processing program is started based on an activation command described later from the initial processing after power-on.

   FIG. 3 is a schematic flowchart of a calendar information setting program started from the main program of FIG. 2. The calibration value of the calendar clock incorporated in the SRAM 406 is input.

  FIG. 4 is a schematic flowchart of the TRIP value setting program started from the main program of FIG. 2, in which the irradiation target integrated dose value (hereinafter abbreviated as TRIP value) is recorded in the SRAM 406, set in the work RAM 405, and is stored in the TP 401. Display.

  FIG. 5 is a schematic flowchart of the RESET processing program started from the main program of FIG. 2.When an operator (not shown) completes irradiation in a predetermined procedure, the TP 401 of the dosimeter 4 or the TP 52 of the irradiation apparatus body 5 is changed. With the RESET information generated by the operation, the accumulated dose values of the SRAM 406, work RAM 405 and TP 401 are cleared and the measurement integration circuit is locked.

  FIG. 6 is a schematic flowchart of the integrated dose measurement program started from the main program of FIG. 2, which is the main program of the dosimeter, and transmits an irradiation end signal to the irradiation device 5 when a predetermined integrated dose is reached.

  FIG. 7 is a schematic flowchart of an irradiation record output processing program started from the main program of FIG. 2, and displays irradiation history for a long period of time, for example, half a year, on the TP401 by an irradiation record output command from TP401 of the dosimeter 4. At the same time, the data is output to the PC 10 or the like via the USB converter 9.

  FIG. 8 is an example in which the irradiation records output from the dosimeter are expanded into a spreadsheet software data file by a PC 10 or the like.

  FIG. 9 is an example of an irradiation record recorded in the SRAM 406 by the dosimeter 4 according to the present invention and a recording state of the TRIP value and the calibration constant set in the dosimeter 4.

Hereinafter, the operation of the dosimeter according to the present invention will be described in detail with reference to FIGS.
First, when the dosimeter power is turned on (usually turned on and off at the same time as the X-ray irradiation device), the CPU 402 performs predetermined initial settings and automatic offsets on peripheral ICs as shown in FIG. -Perform automatic zero adjustment (step: 101).

  For example, if the AD7703 manufactured by Analog Device is used as the AD converter, the function is prepared in the device itself, and the automatic offset adjustment can be used. However, automatic zero adjustment must be performed for the entire circuit system including probe 3 to ADC 417 in FIG. This is because the output current from the probe 3 is very weak, so that errors in measurement values caused by subtle differences in the circuit system and environmental temperature are suppressed. In this embodiment, a high voltage is applied to the probe 3, and the integration operation of the integration circuit system is performed for a predetermined period of time, for example, 10 seconds, without irradiating X-rays, and the output value is AD-converted to obtain a fluctuation value per unit time. In the actual measurement process, if the fluctuation is positive, subtract the predetermined value from the actual measurement value, and if the fluctuation value is negative, add the predetermined value to the actual measurement value, Corrections are made to ensure measurement accuracy.

Thereafter, the CPU 402 checks for abnormalities such as irradiation records, TRIP values, and calibration constants recorded in the SRAM 406 of FIG.
(Step: 102)
For irradiation records, TRIP values, calibration constants, etc., for example, the data shown in FIG. 9 is recorded in the RAM 405, and whether there is an abnormality is simply summed up in bytes for each block, and the value Is determined by whether or not it matches the recorded SUM value. In the dosimeter according to the present invention, since the same data in FIG. 9 is recorded in the RAM 405 for two blocks, if there is an abnormality in either one, copy it from the person with no abnormality to the person with the abnormality, and always Modify the two blocks so that the SUM values match. (Step: 104)

  When both blocks are abnormal (step: 103), the CPU 402 executes an abnormal process (step: 105). The specific content of this process is that the device is stopped after an error message is displayed. If there was no abnormality, or if only one block could be corrected due to an abnormality, the information on whether it ended with RESET was read from SRAM 406 and judged in step 106.If it ended with RESET, After clearing the measured display value to zero and the work RAM for recording the progress of the integrated value to zero in step 108, the routine enters the start instruction waiting routine for each process.

If the latest previous irradiation did not end with RESET, the CPU 402 reads and displays the latest previous value from the predetermined address of SRAM406, assuming that there is a possibility of continuing irradiation in addition to the last final irradiation value. Then, it is also set to a predetermined address in the work RAM 405.
(Step: 107)

After that, the CPU 402 sets the calendar information necessary as the irradiation record information (step: 115), the TRIP value setting process (step: 116) for ending the irradiation with the predetermined integrated dose, the RESET process (step: 117), the actual Irradiation amount measurement processing (step: 118), when an operator (not shown) inputs a print command, print processing (step: 119) for printing the previous irradiation data, and an operator (not shown) outputs from TP406. By inputting the command, the irradiation record in the specified range is displayed on the TP401, and it is sequentially checked whether there is an instruction for starting the irradiation record output process (step: 120) to be output to the PC 10 or the like (from step: 109) 114). If there is any activation instruction, the CPU 402 executes the corresponding process. Each process from “I. Calendar setting process” to “VI. Irradiation record output process” started in steps 109 to 114 is mutually exclusive, and while one of the processes is started, It is controlled not to start the process.
Hereinafter, each processing content will be described in detail with reference to FIGS.

Explanation of “I. Calendar setting process”
When the date and time information setting instruction is input from TP401 of the dosimeter 4, the CPU 402 detects in step 109 of FIG. 2, activates “I. Calendar setting processing” of FIG. 3, and is set to TP401. Date / time setting information is set in the clock section of the SRAM 406 having a calendar function (step 158 in FIG. 3). As a result, the clock portion of the SRAM 406 keeps the time as a calendar, and the CPU 402 reads the contents at an arbitrary time, so that the date and time information at that time can be read in seconds. This type of SRAM is M48T37Y of TIMEKEEPER SRAM from ST Micro.

Explanation of “II. TRIP value setting process”
When an instruction for setting a TRIP value is input from TP401 of the dosimeter 4 or TP52 of the irradiation apparatus 5, the CPU 402 recognizes at step 110, and starts “II. TRIP value setting processing” of FIG. Specifically, the CPU 402 reads the TRIP value set in the TP401, for example, a value of 15 Gy, and records it in the first block of the SRAM 406 in FIG. 1 as the TRIP value at the time of subsequent irradiation dose measurement, and the SUM value at that time is also recorded. Calculate and record. (Step: 121)
Next, the CPU 402 records the same value in the second block of the SRAM 406 in FIG. 1, and also calculates and records the SUM value at that time (step: 122). An example of this recording is shown in the constant part of FIG.
Next, the CPU 402 records the read TRIP value in the work RAM at a predetermined address of the RAM 405 used at the time of accumulated dose measurement, and displays it on the TP 401. (Step: 123)
The calibration constants in Fig. 9 are calibration constants compared to the standard measurement prototype, and the atmospheric correction factor is a correction constant determined by the climatic conditions at the time of measurement, and is determined and recorded by a known method. is there.
These constants are used to ensure the accuracy of the accumulated dose value in the process of calculating the accumulated dose.
Each time the TRIP value is set to a new value, the CPU 402 overwrites it on two blocks of the SRAM 406, and also overwrites the SUM value on two blocks.

  CPU402 records TRIP value and SUM value to SRAM406 one by one of the two blocks, so abnormal situation such as power off in either TRIP value recording or SUM value calculation recording process Even if an error occurs, the possibility of data corruption cannot be excluded from the currently accessed part, but the risk of data corruption in the other block is very low. In the recorded content abnormality check (step: 101), since it can be repaired even if the SUM values do not match, the reliability can be remarkably improved.

Explanation of “III. RESET Processing”
In the RESET process, when irradiation of the object is completely completed in a predetermined procedure, an operator (not shown) inputs the end of one irradiation to the entire irradiation apparatus 5 including the dosimeter, and causes the CPU 402 to perform necessary processing. Is for.
When the RESET command is set at TP401 of the dosimeter 4 or TP52 of the irradiation device 5, the CPU 402 recognizes at step 111 and activates “III. RESET processing” of FIG. When this process is started, the CPU 402 records the end information by RESET at the predetermined address of the first block of the SRAM 406 shown in FIG. 1, and calculates and records the SUM value. (Step: 124)
Next, the CPU 402 records the same information at a predetermined address of the second block of the SRAM 406 shown in FIG. 1 by RESET, and calculates and records the SUM value. (Step: 125)

  Next, the CPU 402 clears the integrated dose value displayed on the TP 401 and the integrated dose value at a predetermined address in the RAM 405, closes the contact 415 of the measurement integration circuit, and discharges the integration capacitor 413 and locks the integration circuit. Further, the CPU 402 updates the ring counter indicating the address for recording the next irradiation record by the number of data of one irradiation record (in this embodiment, 12 addresses), and also records the SUM value at that time. Similar to the recording of the RESET information, the CPU 402 divides the two blocks into two parts and performs them individually. (Step: 126)

  As with the above TRIP value setting, the CPU 402 records RESET information, ring counter value, and SUM value to the SRAM 406 one by one of the two blocks, so record the RESET value and record the SUM value. Even if an abnormal situation such as the power being cut off occurs in any of the processes, the possibility of data corruption cannot be excluded from the currently accessed part. However, since the risk of data corruption in the other block is very low, even if the SUM values do not match in the SRAM406 record content error check (step: 101) that is performed when the power is turned on next time. Since it can be repaired, the reliability can be greatly improved.

Explanation of “IV. Measurement Process” When an irradiation start command is set at TP401 of the dosimeter 4 or TP52 of the irradiation apparatus 5, the CPU 402 of the dosimeter 4 recognizes in step 112, and “IV. ". When this process is started, the CPU 402 refers to the latest irradiation record from the irradiation record in the SRAM 406, and determines whether or not the irradiation has been completed by RESET. (Step: 127)
When the process is completed by RESET, the CPU 402 determines that the irradiation is a new irradiation to be recorded in the irradiation record, and records the irradiation start date and time information and the SUM value at the first block address of the SRAM 406 indicated by the ring counter. Next, the CPU 402 records the same information at the second block address. (Step: 128)
If not finished by RESET, the CPU 402 determines in step 129 whether or not the measurement start command is immediately after the power is turned on.
If it is immediately after the power is turned on, the CPU 402 determines that the irradiation performed before the power is cut off is continued, does not record the measurement start date / time information in the SRAM 406, and only releases the lock of the measurement circuit, step 130. Move to the measurement process. If it is not immediately after the power is turned on, the CPU 402 determines that the previous irradiation was once interrupted, and proceeds to the measurement process of step 130.

Upon entering step 131, the CPU 402 sets the MPX 416 in FIG. 1 to the integrator side, drives the ADC 417 to AD-convert the output of the integrator, converts the measured value into a dose value at a predetermined ratio, and then stores it in the RAM 405. Accumulated in work RAM and displayed on TP401. The CPU 402 reads the time information at that time from the calendar clock of the SRAM 406 and temporarily records it in the RAM 405.
CPU402 performs dose integration calculation,
The current measurement value—the previous measurement value = the dose value to be integrated is digitally integrated into the work RAM. If the measurement is interrupted or immediately after the power is turned on and the previous time has not ended with RESET, the CPU 402 subtracts the measured value immediately after restarting the measurement from the next measured value, so that the dose value to be integrated is calculated. Therefore, it is possible to eliminate an error in measurement values due to leakage of the integrator during the interruption period. (Step: 131)

The CPU 402 overwrites the accumulated data and measurement time information of the accumulated work RAM on the predetermined address of the first block of the SRAM 406, and also calculates and overwrites the SUM value. (Step: 132)
Furthermore, the CPU 402 overwrites the same data on a predetermined address of the second block of the SRAM 406, and calculates and overwrites the SUM value. (Step: 133)
An example of an irradiation record recorded in this way is shown in FIG.

In the above description, the irradiation end time information (measurement time information) has been described as recording only time information, but since normal irradiation usually ends within 10 minutes, the measurement start date and time information is If so, it is easy to determine the irradiation date. In addition, although described as an embodiment in which only accumulated dose value information is recorded, since it is measured four times per second, irradiation dose rate (Gy / min) information is:
(This measured cumulative dose value-previous measured cumulative dose value) x 240 can be obtained, and this can be easily added and recorded as irradiation record information in the same way as the cumulative dose value. Needless to say. Thereby, not only the irradiation dose but also the irradiation dose rate can be managed.

Next, the CPU 402 checks whether or not a condition to end the measurement has occurred (step: 134 or 135). If there is no STOP command and the TRIP value has not been reached, the CPU 402 waits for about 250 ms. (Step: 136), measurement is continued. By waiting for this time, measurement is continued at a rate of 4 times per second.
If there is a STOP command or the TRIP value is reached, the CPU 402 ends the measurement, sends a measurement end signal to SQ51 of the irradiation device 5, and displays a message indicating that the dosimeter 4 has entered the measurement end state, for example To inform the operator. In this way, the measurement time information is recorded for each measurement (every 250 ms), and the integrated dose value and SUM value are recorded together in the SRAM 406 backed up by the battery 407, so at any point during irradiation Even if an abnormal situation such as a power interruption occurs, only an error between the accumulated dose value for 250 ms and the irradiation end time of 250 ms occurs. In other words, since the irradiation condition of the blood bag is usually about 15 Gy and the irradiation time is about 8 minutes, an error of 250 ms with respect to 8 minutes is about 0.05%, which is acceptable. In addition, the irradiation record data can be recorded and retained with sufficient reliability as in the case of protection from damage due to unexpected power interruption of the TRIP value / RESET information.

Explanation of “V. Print Process” When the start of this process is instructed by TP401 of the dosimeter 4 or TP52 of the irradiation device 5, the CPU 402 detects in step 113, and is measured and integrated in “III. Measurement process”. The accumulated irradiation dose value is printed on the printer 8. Next, the CPU 42 causes the printer 8 to print the tube voltage and tube current information recorded at a predetermined address of the work RAM 405 of the dosimeter together with the measurement end date / time information recorded in “III. Measurement process”. This printed material is used for identification management of the irradiation object by pasting it on the irradiation object such as a blood bag.

Explanation of “VI. Irradiation record output process” When the irradiation record output command is set by TP401 of dosimeter 4 and recognized by CPU 402 of dosimeter 4 (step: 112), CPU 402 will display “VI. Irradiation record output process”. ". When this process is started, the CPU 402 of the dosimeter 4 reads the number (N) of irradiation records to be displayed or printed specified in the TP 401 and sets it in the work RAM at a predetermined address in the RAM 405.
(Step: 138)
Next, the CPU 402 reads the address recorded in the latest irradiation record from the address information indicated by the ring counter in the SRAM 406, and sets it in the work RAM at a predetermined address in the RAM 405.
(Step: 139)
Next, the CPU 402, from the irradiation record in the SRAM 406, measurement date information, measurement start time information, measurement end time information (the last measurement time explained above, time information overwritten for each measurement), integrated dose value, Displayed on TP401 or converted to CSV format (text file with each data separated by commas), and sequentially output from RS232IF404 to PC10 etc. via USB converter 6. As shown in FIG. 8, the output order is performed so that it can be easily arranged. (Step: 140 to 143)
Next, the CPU 402 determines whether or not the designated number is displayed or output. (Step: 144). As a result of this determination, if N sets of display or output are incomplete, the CPU 402 subtracts one set (12 in this embodiment) of the take-out address, and repeats the same display or output processing as described above. As a result, N sets of display or output can be performed in order from the latest to the oldest.

  Also, in this embodiment, N sets are displayed or output from the latest one, but by using date and time information, aa year bb month cc hour dd minute ee second minute to ff year gg month hh hour kk minute jj second minute It is possible to display or output all irradiation records, or display or output irradiation records in an arbitrary range / number of sets by an input operation from the TP 401 of the dosimeter 4 by an operator (not shown).

The present invention is not limited to the above-described embodiment, and by combining a semiconductor detector or a γ-ray probe instead of an ion chamber radiation detector, a γ-ray dosimeter or other object can be easily obtained. Can be a dosimeter.
In the above description, the measurement is performed at a cycle of 250 ms. However, if an error becomes a problem due to the measurement, the measurement can be improved by shortening the measurement cycle, for example, a cycle of 100 ms.
Further, in the above embodiment, the output current of the probe 3 is integrated by the integration circuit and then AD converted and measured. However, the output current of the probe 3 is converted to voltage, AD converted at a higher repetition frequency, and digitally converted. It is also possible to achieve the object of the present invention by integrating them.

  As described above, according to the present embodiment, even when an abnormality such as a power failure occurs in the middle of irradiation, irradiation can be continued with an acceptable accuracy after recovery from the power failure. In addition, long-term irradiation records can be recorded in the irradiation history management, and the irradiation records can be displayed on the TP401 for any period or number of times and output to an external PC 10 etc. in a data format that is easy to manage. The end time can also be grasped with sufficient accuracy for practical use. Furthermore, by recording two sets of calibration constants necessary for irradiation recording and measurement, including information for determining the correctness of the data, and recording at each individual timing, with a very high probability even in the event of an unexpected power outage, Since either side can leave correct data, it can provide a useful dosimeter for a radiation measurement system that requires high reliability.

  In addition, the individual irradiation history is recorded on the dosimeter itself for a long period, for example, half a year, and it is displayed for an arbitrary period, or a format convenient for data management on the PC 10 etc., for example, general-purpose spreadsheet software Can be output as CSV data that can be handled by.

  The present invention relates to an X-ray or γ-ray irradiation device for blood for blood transfusion, small experimental animals, etc., and relates to a dosimeter that controls the irradiation time by measuring the integrated dose, and particularly during the management of irradiation history and during irradiation The present invention relates to a dosimeter that is suitable for continuing irradiation with appropriate accuracy even if irradiation is interrupted due to a power failure.

1 is a configuration block diagram of an X-ray irradiation system combining an X-ray dosimeter according to the present invention. The schematic flowchart of the control main program of the dosimeter by this invention. 6 is a schematic flowchart of a calendar information setting program. A schematic flowchart of a TRIP value setting program. A schematic flowchart of a RESET processing program. The general | schematic flowchart of an integrated dose measurement program. 6 is a schematic flowchart of an irradiation record output process program. The example which the PC expand | deployed the irradiation record which the dosimeter output by this invention output to the data file of the spreadsheet software. The irradiation record which the dosimeter by this invention recorded on SRAM, and the example of recording states, such as the TRIP value and calibration constant which are set to a dosimeter.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... X-ray tube apparatus, 2 ... Irradiation target object, 3 ... Probe, 4 ... Radiation dosimeter main body, 5 ... X-ray irradiation apparatus, 6 ... Data cable, 7 ... High voltage cable, 8 ... Printer, 9 ... USB converter 10 ... Personal computer (PC) for irradiation record output

Claims (3)

A radiation dosimeter comprising means for detecting radiation, means for measuring and integrating the radiation in a predetermined cycle, and means for holding the accumulated data accumulated by the accumulating means even when the power supply of the apparatus is shut off And at least one of the radiation integrated value measured and integrated in the predetermined cycle, or the dose value measured in the predetermined cycle and the dose rate information calculated from the predetermined cycle information, in the predetermined cycle. Control means for recording ,
Means for setting information indicating that the measurement / integration processing of radiation has been completed in a predetermined procedure, and the control means can hold the information that has been completed in the predetermined procedure when the power supply is shut off; A radiation dosimeter that is recorded in the means and determines whether or not the measurement should be continued based on the presence or absence of information that has been completed in the predetermined procedure when the measurement is resumed from interruption or when the power is turned on again . A radiation dosimeter comprising means for detecting radiation, means for measuring and integrating the radiation in a predetermined cycle, and means for holding the accumulated data accumulated by the accumulating means even when the power supply of the apparatus is shut off And at least one of the radiation integrated value measured and integrated in the predetermined cycle, or the dose value measured in the predetermined cycle and the dose rate information calculated from the predetermined cycle information, in the predetermined cycle. Control means for recording,
The information group recorded in the means capable of holding information even when the power supply is shut off is set as one information set, and two sets of data of a plurality of information sets are recorded in the holding means even when the power supply is shut off. The total value (SUM value) of the information is also recorded in the holding means in two sets for each set even when the power supply is shut off, and the recording of the two sets of information and the recording of the SUM value are the first A radiation dosimeter characterized in that a second set of records is made after a set of records is completed . Means for obtaining the measurement start date / time information of the radiation and the measurement time information for each of the predetermined cycles, and the control means also includes at least one of the measurement start date / time information and the measurement time information of the predetermined cycles for the predetermined The radiation dosimeter according to claim 1, wherein the radiation dosimeter is recorded in the holding unit at a period .

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