Wide-range coaxial through-wall double ionization chamber area gamma radiation detection method

Abstract

The invention discloses a wide-range coaxial through-wall double ionization chamber region gamma radiation detection method. The method comprises the following steps of: 1, constructing a detector; 2, making a high-range zeroing circuit work and solidifying the high-range zeroing circuit work; 3, installing a detector; 4, setting the working time interval of a low-range zeroing circuit, and starting the detector; 5, making the low-range zero setting circuit work; 6, gating a first high-range signal acquisition circuit; 7, gating a second high-range signal acquisition circuit; 8, gating a second low-range signal acquisition circuit; 9, gating a first low-range signal acquisition circuit; and 10, ending the timing of the low-range zeroing circuit, and circulating the steps 5-9 to realize the long-term continuous detection of the gamma radiation in a wide-range coaxial through-wall double-ionization chamber region. The four gamma radiation detection circuits for different grades are circularly switched; in order to ensure that the circuits fail due to negative drift of field effect geminate transistors during background measurement in each cycle, the low-range zeroing circuit is specially designed to adjust the zero point of the geminate transistors, and zeroing processing is carried out on the low-range signal acquisition circuit.

Description

technical field [0001] The invention belongs to the technical field of gamma radiation detection, in particular to a gamma radiation detection method in a wide-range coaxial through-wall double ion chamber area. Background technique [0002] Experiments and use of nuclear weapons, leakage of nuclear power plants, loss of nuclear substances used in industry or medical treatment, nuclear weapons explosions, thermal radiation damage, nuclear radiation damage, and radioactive retention will all lead to nuclear pollution. The radioactive fallout from nuclear pollution can enter the human body through the food chain. Harmful effects can occur when a certain dose is reached in the body. People will experience dizziness, headache, loss of appetite and other symptoms, which will cause pathological changes in various tissues and organs. Therefore, the control of nuclear pollution is imperative. Most of the waste generated by existing nuclear pollution is transported to the shielding ...

AI Technical Summary

Problems solved by technology

Therefore, the control of nuclear pollution is imperative. Most of the waste products produced by existing nuclear pollution are transported to the shielded room for treatment, and the operators observe the results outside the shielded room. Small, complex structure, inconvenient application, the detector range generally counts between 1uGy / h-500Gy / h, and the range span is generally 6-7 orders of magnitude, there is still room for high-range radiation environment counting, so now Today, there is a lack of an electrometer circuit for wide-range ionization chamber area gamma radiation detectors to continuously monitor the air dose rate of the area environment or plant that may be radioactively contaminated to check the integrity of process equipment and system boundaries to prevent radioactive material leakage or Release; discover abnormal changes in the radioactivity level in the workplace in time to ensure that workers are not exposed to high radiation doses; ensure that the radioactive activity of the gas discharged from the nuclear area is lower than the limit specified by the national standard, protect the environment, and ensure the radiation safety of the public

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