Wide-range gamma dosimeter

Abstract

The invention provides a wide-range gamma dosimeter. The wide-range gamma dosimeter comprises a detection module, an acquisition and analysis module used for acquiring, analyzing and processing electric pulse signals output by the detection module, and a data collection and distribution module used for man-machine interaction and data sharing. The detection module comprises a scintillator detector and a reading circuit, the acquisition and analysis module comprises a conditioning circuit, an AD converter and an FPGA (field programmable gate array), the wide-range gamma dosimeter enables the scintillator detector to work in a monopulse mode and a current mode by using the FPGA to cooperate with the AD converter, the measurement range of the gamma dose rate is expanded, and the measurement accuracy is improved. And the gamma-ray energy spectrum can be obtained in a monopulse mode.

Description

technical field [0001] The invention belongs to the technical field of ionizing radiation detection. Specifically related to a wide-range gamma dosimeter Background technique [0002] Gamma dose rate meters are widely used in radiation monitoring, special workplaces in the nuclear industry, nuclear medicine, nuclear security and other fields. Warning, to provide radiation safety guarantee for relevant practitioners. [0003] The dose conversion methods used in the existing gamma dose rate meter mainly include count rate conversion method, G(E) function method, and current method. Among them, when the count rate conversion method is applied to inorganic scintillators, the dose rate obtained by the count rate conversion will have a large error due to the higher energy response at the low energy end, and in the high ambient dose rate, the measurement will be caused by the accumulation of detector pulse signals. The deviation increases; the G(E) function method uses the full ...

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Problems solved by technology

Among them, when the count rate conversion method is applied to inorganic scintillators, the dose rate obtained by the count rate conversion will have a large error due to the high energy response at the low energy end, and in the high environmental dose rate, it will cause the measurement due to the accumulation of detector pulse signals. The deviation increases; the G(E) function method uses the full gamma energy spectrum information for dose rate conversion, and the conversion accuracy is the best, but the pulse signal of the detector is seriously piled up in the high environmental dose rate, and the accurate gamma energy spectrum cannot be obtained As a result, the method fails; the working condition of the above two methods is that the detector is in the single pulse mode; although the current method can cooperate with the detector to work in the current mode in the high dose rate environment, it will be affected by the detection sensitivity in the low dose rate environment. Insufficient lead to increased error

[0004] Existing types of gamma dosimeters often use a single detector because they can only work in single pulse mode or current mode, so the dose rate range coverage is narrow, especially inorganic scintillator detectors are usually used as environmental gamma detectors. Equipment for horse dose rate detection may lead to misjudgments in emergencies because the dose rate range cannot be covered. Under this background, wide-range gamma dosimeters are of great significance to gamma dose rate meters.

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