CN111781430B - Device and method for simulating X and gamma dose rate measurement in passive mode - Google Patents
Device and method for simulating X and gamma dose rate measurement in passive mode Download PDFInfo
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- CN111781430B CN111781430B CN202010569064.9A CN202010569064A CN111781430B CN 111781430 B CN111781430 B CN 111781430B CN 202010569064 A CN202010569064 A CN 202010569064A CN 111781430 B CN111781430 B CN 111781430B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0857—Dosimetry, i.e. measuring the time integral of radiation intensity; Level warning devices for personal safety use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
Abstract
The invention discloses a device and a method for simulating X and gamma dose rate measurement in a passive mode, which simulate the dose of gamma radiation source radiating gamma photons to the point of an X and gamma ray detector by a method of measuring the intensity of a radiation field at the point of a radio frequency signal source radiating to radio frequency measurement equipment, simulate the measurement of X and gamma rays by measuring the effective value of radio frequency power, realize the training of workers under the condition without a gamma radiation source, enable the personnel operating the X and gamma measurement equipment to be familiar with the measurement equipment and adapt to the measurement site environment, and reduce the unnecessary gamma irradiation brought by the operators for the purposes of familiarizing the equipment and the environment. In addition, the change of the radio frequency signal intensity can simulate the change of other physical quantities (such as temperature, pressure, flow rate and the like), so that the equipment or facilities can be debugged or checked without actual change of the physical quantities.
Description
Technical Field
The invention relates to the technical field of nuclear radiation detection, in particular to a device and a method for simulating X and gamma dose rate measurement in a passive mode.
Background
In order to make the personnel engaged in nuclear radiation monitoring familiar with and even proficient in using X-ray and gamma-ray detectors and measurement methods, the personnel are trained accordingly. If a gamma radioactive source is used in the training process, workers can be subjected to unnecessary gamma irradiation, and the radioactive source is placed on a training site, so that the problems of transportation safety of the radioactive source and safety of using the radioactive source on the site can be solved. Therefore, there is a need for a measurement device and method that does not have X and gamma radiation sources but that subjectively feels consistent with a scene with the sources, and that allows personnel to be trained in passive conditions to become familiar with nuclear radiation measurement devices and sophisticated measurement methods.
Disclosure of Invention
The invention aims to provide a device and a method for simulating X and gamma dose rate measurement under the condition of no radioactive source.
The technical scheme adopted by the invention for solving the technical problems is as follows: a device for simulating X and gamma dose rate measurement in a passive mode comprises:
and (3) a radio frequency signal source for simulating X and gamma signal output: the radio frequency signal generator can generate radio frequency signals with different frequencies and power magnitudes according to requirements;
the radio frequency signal amplification module: the device is used for measuring the radio frequency power, mainly receiving a radio frequency signal, carrying out logarithmic amplification and processing on the radio frequency signal, and outputting an analog voltage signal representing the effective value of the radio frequency signal power;
the analog signal processing module: the analog voltage signal is used for processing the analog voltage signal output by the radio frequency signal amplification module, and the magnitude value of the analog signal output after the processing is used for representing the strength of the simulated X and gamma radiation fields; analog voltage signals output by X-ray and gamma-ray detectors for measuring X-ray and gamma-ray sources can be processed.
Further, the radio frequency signal amplification module is a multistage logarithmic amplifier.
Further, the chip model of the multistage logarithmic amplifier is AD 8307.
Furthermore, a selection switch is arranged between the analog signal processing module and the output end of the radio frequency signal amplification module, and the selection switch is selectively connected with the output end of the radio frequency signal amplification module and also selectively connected with the output ends of the X-ray and gamma-ray detectors.
A passive mode simulation X, gamma dose rate measuring device, including the radio frequency signal source of simulation X, gamma signal output, the radio frequency signal who is used for measuring radio frequency power enlargies module and voltage frequency conversion module, frequency signal processing module, wherein:
the radio frequency signal source: radio frequency signals with different frequencies and power magnitudes can be generated according to requirements;
the radio frequency signal amplification module: the analog voltage signal is used for receiving the radio frequency signal, carrying out logarithmic amplification and processing on the radio frequency signal and outputting an analog voltage signal representing the power effective value of the radio frequency signal;
the voltage frequency conversion module: the pulse frequency signal is used for converting the analog voltage signal into a pulse frequency signal proportional to the magnitude of the analog voltage and outputting the pulse frequency signal;
the frequency signal processing module is used for processing the pulse frequency signal output by the voltage frequency conversion module, and the speed value of the processed output frequency signal represents the strength of the simulated X and gamma radiation fields; and the pulse frequency signals output by the X-ray detector and the gamma-ray detector for measuring the X-ray and the gamma-ray sources can be processed.
Further, the radio frequency signal amplification module is a multistage logarithmic amplifier.
Further, the chip model of the multistage logarithmic amplifier is AD 8307.
Further, the chip model of the voltage-frequency conversion module is AD 7740.
Furthermore, a selection switch is arranged between the frequency signal processing module and the output end of the voltage-frequency conversion module, and the selection switch is selectively connected with the output end of the voltage-frequency conversion module and also selectively connected with the output ends of the X-ray and gamma-ray detectors.
A method for simulating X and gamma dose rate measurement in a passive mode comprises the following steps:
s1, judging the signal types output by the X-ray detector and the gamma-ray detector, and if the output is an analog signal, executing S2-S4; if the output is a pulse signal, executing the steps S5-S8;
step S2, generating radio frequency signals simulating X and gamma signals by a radio frequency signal source;
step S3, the radio frequency signal amplification module receives the radio frequency signal, performs logarithmic amplification and processing on the radio frequency signal, and outputs an analog voltage signal representing the power effective value of the radio frequency signal;
step S4, the analog signal processing module processes the analog voltage signal and outputs an analog signal, and the magnitude value of the analog signal is used for representing the strength of the simulated X and gamma radiation fields;
step S5, generating radio frequency signals simulating X and gamma signals by a radio frequency signal source;
step S6, the radio frequency signal amplification module receives the radio frequency signal, performs logarithmic amplification and processing on the radio frequency signal, and outputs an analog voltage signal representing the power effective value of the radio frequency signal;
step S7, converting the analog voltage signal into a pulse frequency signal proportional to the analog voltage and outputting the pulse frequency signal by a voltage frequency conversion module;
and step S8, the frequency signal processing module processes the pulse frequency signal and outputs a frequency signal, and the speed value of the frequency signal indicates the strength of the simulated X and gamma radiation fields.
The invention has the beneficial effects that:
(1) the device and the method simulate the dosage of gamma radiation source to the point of the X-ray and gamma-ray detectors by measuring the radiation field intensity of the point of the radio-frequency measuring equipment (namely, the radio-frequency signal amplification module and the voltage frequency conversion module) irradiated by the radio-frequency signal source, simulate the measurement of X and gamma rays by measuring the effective value of radio-frequency power, realize the nuclear radiation monitoring training of workers under the condition without the X and gamma radiation sources, enable the workers operating the X and gamma-ray detectors to be familiar with the measuring equipment and adapt to the measuring field environment, and reduce the unnecessary gamma irradiation brought by the operators for the purposes of being familiar with the equipment and the environment.
(2) The output signal of the analog measuring device has analog and frequency output, and corresponds to two possible analog and frequency signal outputs of the X-ray and gamma-ray detectors.
(3) And the performance of the parts of the X-ray and gamma-ray radiation measuring equipment except the X-ray and gamma-ray detectors in the field of the nuclear facility can be detected under the passive condition.
(4) The circuit for measuring the effective value of the radio frequency power is added on the channel of the non-X and gamma detection equipment, so that the strength and weakness of various measurement signals of various non-X and gamma radiation measurement equipment can be simulated, namely the strength change of the radio frequency signal can also simulate the change of other physical quantities (such as temperature, pressure, flow and the like), and the equipment or facilities can be debugged or checked under the condition that the physical quantities do not actually change.
Drawings
FIG. 1 is a schematic block diagram of a measurement apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic block diagram of the measurement of the apparatus according to the second embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: as shown in fig. 1, a passive mode device for simulating X and γ dose rate measurement includes a radio frequency signal source 11 for simulating X and γ signal output, a radio frequency signal amplification module 12 and an analog signal processing module 13, wherein a selection switch 14 is arranged between the analog signal processing module 13 and an output end of the radio frequency signal amplification module 12, wherein:
the radio frequency signal source 11: radio frequency signals with different frequencies and power magnitudes can be generated according to requirements;
the radio frequency signal amplification module 12: the device is used for measuring the radio frequency power, mainly receiving a radio frequency signal, carrying out logarithmic amplification and processing on the radio frequency signal, and outputting an analog voltage signal representing the effective value of the radio frequency signal power;
the analog signal processing module 13: the analog voltage signal processing module is used for processing the analog voltage signal output by the radio frequency signal amplifying module 12, the magnitude value of the analog signal output after the processing is used for representing the strength of the simulated X and gamma radiation fields, and the analog voltage signal output by the X and gamma ray detector 17 used for measuring X and gamma radioactive sources can also be processed.
In the first embodiment, the radio frequency signal amplifying module 12 adopts a multi-stage logarithmic amplifier, and the chip model is AD 8307. The radio frequency signal source 11 adopts an electromagnetic radiation signal in ISM (industrial, scientific and medical) wave band, and can control the radio frequency signal source to perform switching or size changing actions to simulate the existence and intensity change of X and gamma rays, and the dynamic range of the intensity of the generated radio frequency signal can reach 92dB and 9 orders of magnitude, thereby completely meeting the range of various measuring devices which can be seen almost.
When the output of the X-ray detector 11 and the gamma-ray detector 11 for measuring the X-ray and the gamma-ray sources is analog signals, a worker engaged in nuclear radiation monitoring selects the analog device of the first embodiment to train under a passive condition, and connects the selection switch 14 with the output end of the radio-frequency signal amplification module 12 to simulate the measurement process of the X-ray and the gamma-ray, and the specific analog measurement method comprises the following steps:
step S1: generating radio frequency signals simulating X and gamma signals by a radio frequency signal source 11;
step S2, the rf signal amplifying module 12 receives the rf signal, performs logarithmic amplification and processing on the rf signal, and outputs an analog voltage signal representing the power effective value of the rf signal;
step S3, the analog signal processing module 13 processes the analog voltage signal and outputs an analog signal, where the magnitude of the analog signal is used to indicate the strength of the simulated X and γ radiation fields.
When the X and gamma radioactive sources need to be monitored, the selection switch 14 is connected with the output ends of the X and gamma ray detectors 17, namely, the analog signal processing module 13 is connected with the X and gamma ray detectors 17, so that the X and gamma radioactive source measuring device becomes an actual X and gamma radioactive source measuring device and directly measures X and gamma dose rates.
Example two: as shown in fig. 2, a passive analog X/γ dose rate measurement apparatus includes a radio frequency signal source 11 for simulating X/γ signal output, a radio frequency signal amplification module 12 for measuring radio frequency power, and a voltage-to-frequency conversion module 15, a frequency signal processing module 16, and a selection switch 14 is disposed between the frequency signal processing module 16 and an output end of the voltage-to-frequency conversion module 15, wherein:
the radio frequency signal source 11: radio frequency signals with different frequencies and power magnitudes can be generated according to requirements;
the radio frequency signal amplification module 12: the analog voltage signal is used for receiving the radio frequency signal, carrying out logarithmic amplification and processing on the radio frequency signal and outputting an analog voltage signal representing the power effective value of the radio frequency signal;
the voltage frequency conversion module 15: the pulse frequency signal is used for converting the analog voltage signal into a pulse frequency signal proportional to the magnitude of the analog voltage and outputting the pulse frequency signal;
the frequency signal processing module 16 is configured to process the pulse frequency signal output by the voltage-frequency conversion module 15, and the fast and slow values of the processed output frequency signal represent the strengths of the simulated X and gamma radiation fields; the pulse frequency signals output by the X-ray detector 17 and the gamma-ray detector 17 for measuring the X-ray and the gamma-ray sources can also be processed.
In the second embodiment, the same radio frequency signal amplification module 12 and the same radio frequency signal source 11 as those in the first embodiment are selected, and the chip model of the voltage-frequency conversion module 15 is AD 7740.
When the output of the X-ray detector 11 and the gamma-ray detector 11 for measuring the X-ray and the gamma-ray sources are pulse signals, the staff engaged in the nuclear radiation monitoring selects the simulation device of the second embodiment to train under the passive condition, and connects the selection switch 14 with the output end of the voltage-frequency conversion module 15 to simulate the measurement process of the X-ray and the gamma-ray, and the specific simulation measurement method comprises the following steps:
step S1, generating radio frequency signals simulating X and gamma signals by the radio frequency signal source 11;
step S2, the rf signal amplifying module 12 receives the rf signal, performs logarithmic amplification and processing on the rf signal, and outputs an analog voltage signal representing the power effective value of the rf signal;
step S3, the voltage-frequency conversion module 15 converts the analog voltage signal into a pulse frequency signal proportional to the analog voltage and outputs the pulse frequency signal;
step S4, the frequency signal processing module 16 processes the pulse frequency signal and outputs a frequency signal, where the fast and slow values of the frequency signal indicate the strength of the simulated X and gamma radiation fields.
When the X and gamma radioactive sources need to be monitored, the selection switch 14 is connected with the output ends of the X and gamma ray detectors 17, namely the frequency signal processing module 16 is connected with the X and gamma ray detectors 17, so that the X and gamma radioactive source real measuring device becomes an X and gamma radioactive source real measuring device and directly measures X and gamma dose rates.
In the first and second embodiments, the design concept of the analog measuring device is as follows: since X, gamma photons are also electromagnetic radiation, only the more strongly particulate embodiment. The radio frequency radiation and the radiation of X and gamma photons satisfy the law that the field strength is inversely proportional to the square of the distance from the radiation source (including X and gamma sources and electromagnetic radiation sources). For radio frequency electromagnetic radiation, the field intensity of the radio frequency radiation can be measured by measuring the power effective value of the radio frequency electromagnetic wave, the distance between a radio frequency radiation detector and a radio frequency radiation source is long, the measured power effective value of the radio frequency electromagnetic radiation is small, the measured power effective value of the radio frequency electromagnetic radiation which is close to the radio frequency radiation detector is large, and the inverse square law is met, which is similar to the process of measuring X and gamma rays by an X and gamma detector. Based on the method, a measuring circuit of the radio frequency power effective value is configured on the original X-ray detector and the original gamma-ray detector, and the measurement of X dose rate and gamma dose rate is simulated in a passive mode, so that the training of workers under the passive condition is realized.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. A device for simulating X and gamma dose rate measurement in a passive mode comprises:
and (3) a radio frequency signal source for simulating X and gamma signal output: the radio frequency signal generator can generate radio frequency signals with different frequencies and power magnitudes according to requirements;
the radio frequency signal amplification module: the device is used for measuring the radio frequency power, mainly receiving a radio frequency signal, carrying out logarithmic amplification and processing on the radio frequency signal, and outputting an analog voltage signal representing the effective value of the radio frequency signal power;
the analog signal processing module: the analog voltage signal is used for processing the analog voltage signal output by the radio frequency signal amplification module, and the magnitude value of the analog signal output after the processing is used for representing the strength of the simulated X and gamma radiation fields; the analog voltage signals output by the X-ray and gamma-ray detectors can be processed,
the method is characterized in that: and a selection switch is arranged between the analog signal processing module and the output end of the radio-frequency signal amplification module, and the selection switch is selectively connected with the output end of the radio-frequency signal amplification module and also selectively connected with the output ends of the X-ray and gamma-ray detectors.
2. An apparatus for passively simulating X, gamma dose rate measurements as defined in claim 1 wherein: the radio frequency signal amplification module is a multistage logarithmic amplifier.
3. A passive mode simulation X, gamma dose rate measuring device, including the radio frequency signal source of simulation X, gamma signal output, the radio frequency signal who is used for measuring radio frequency power enlargies module and voltage frequency conversion module, frequency signal processing module, wherein:
the radio frequency signal source: radio frequency signals with different frequencies and power magnitudes can be generated according to requirements;
the radio frequency signal amplification module: the analog voltage signal is used for receiving the radio frequency signal, carrying out logarithmic amplification and processing on the radio frequency signal and outputting an analog voltage signal representing the power effective value of the radio frequency signal;
the voltage frequency conversion module: the pulse frequency signal is used for converting the analog voltage signal into a pulse frequency signal proportional to the magnitude of the analog voltage and outputting the pulse frequency signal;
the frequency signal processing module is used for processing the pulse frequency signal output by the voltage frequency conversion module, and the speed value of the processed output frequency signal represents the strength of the simulated X and gamma radiation fields; the pulse frequency signals output by the X-ray and gamma-ray detectors can be processed,
the method is characterized in that: and a selection switch is arranged between the frequency signal processing module and the output end of the voltage-frequency conversion module, and the selection switch is selectively connected with the output end of the voltage-frequency conversion module and also selectively connected with the output ends of the X-ray and gamma-ray detectors.
4. A device for passively simulating X, gamma dose rate measurements as defined in claim 3 wherein: the radio frequency signal amplification module is a multistage logarithmic amplifier.
5. A passive mode simulation X, gamma dose rate measurement method is characterized by comprising the following steps:
s1, judging the signal types output by the X-ray detector and the gamma-ray detector, and if the output is an analog signal, executing S2-S4; if the output is a pulse signal, executing the steps S5-S8;
step S2, generating radio frequency signals simulating X and gamma signals by a radio frequency signal source;
step S3, the radio frequency signal amplification module receives the radio frequency signal, performs logarithmic amplification and processing on the radio frequency signal, and outputs an analog voltage signal representing the power effective value of the radio frequency signal;
step S4, the analog signal processing module processes the analog voltage signal and outputs an analog signal, and the magnitude value of the analog signal is used for representing the strength of the simulated X and gamma radiation fields;
step S5, generating radio frequency signals simulating X and gamma signals by a radio frequency signal source;
step S6, the radio frequency signal amplification module receives the radio frequency signal, performs logarithmic amplification and processing on the radio frequency signal, and outputs an analog voltage signal representing the power effective value of the radio frequency signal;
step S7, converting the analog voltage signal into a pulse frequency signal proportional to the analog voltage and outputting the pulse frequency signal by a voltage frequency conversion module;
and step S8, the frequency signal processing module processes the pulse frequency signal and outputs a frequency signal, and the speed value of the frequency signal indicates the strength of the simulated X and gamma radiation fields.
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Inventor after: Jin Gen Inventor after: Cheng Jinxing Inventor after: Wang Qingbo Inventor after: Zhu Wenkai Inventor after: Guo Yuexin Inventor after: Wang Jilian Inventor before: Jin Gen Inventor before: Cheng Jinxing Inventor before: Wang Qingbo Inventor before: Zhu Wenkai Inventor before: Guo Yuexin Inventor before: Wang Jilian |