Artificial radionuclide concentration monitoring method and device

Abstract

The invention puts forward an artificial radionuclide dissolvability monitoring method and apparatus. The method comprises the following steps: according pulse signals detected by a semiconductor detector, a 214Bi-214Po coincidence event is extracted; the pulse signals comprise alpha pulse signals and beta pulse signals, and artificial radionuclide concentration is calculated according to the pulse signals detected by the semiconductor detector and the extracted 214Bi-214Po coincidence event. Via use of the artificial radionuclide dissolvability monitoring method and apparatus provided in the invention, effects exerted on artificial radionuclide aerosol measurement by 214Bi-214Po can be eliminated at presence of radon and a radon daughter background, and measurement efficiency can be improved.

Description

technical field [0001] The invention relates to the field of radionuclide monitoring, in particular to an artificial radionuclide concentration monitoring method and device. Background technique [0002] Artificial radionuclides such as uranium and plutonium, which are highly toxic and have a long half-life, mainly undergo alpha decay. After the public or workers inhale radioactive aerosols containing uranium, plutonium and other nuclides, some of the radioactive substances will be converted into insoluble hydrogen. Oxides exist in the form of oxides and remain in the human body for a long time, causing serious harm to human health. Therefore, from the perspective of radiation management, rapid and accurate monitoring of artificial α-radioactive aerosol is an important content of radiation protection and evaluation in workplaces such as nuclear industry manufacturing, nuclear fuel processing and reprocessing, and nuclear facility operation; Internal exposure of personnel is...

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Problems solved by technology

[0003] At present, the emergency monitoring of artificial radionuclide (such as U, Pu) aerosols in nuclear accidents is often susceptible to severe interference from radon and its daughter products in the environment, which may even cause monitoring failure

At present, decay method, ratio method, false coincidence method or energy screening method are usually used at home and abroad to overcome the interference of natural background radon and its progeny in the environment, while energy spectrum measurement is based on factors such as sample self-absorption and radon progeny. There is a certain proportional relationship between the energy degradation of body α particles falling in the low-energy artificial α-nuclide energy region and its own count in the natural channel, so the count compensation in the natural channel is easily affected by the fluctuation of the compensation coefficient during the compensation process. Detection sensitivity

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