Anti-Compton scattering detector

Abstract

The invention discloses an anti-Compton scattering detector, which comprises a main detector made of the sodium iodide material. The lower end of the main detector is connected with a photomultiplier. The main detector is nested into an auxiliary detector compounded of a plastic scintillator. The light guide material is arranged between the main detector and the auxiliary detector. The upper end of the auxiliary detector is connected with the photomultiplier. The lower end of the auxiliary detector is provided with a lead shielding ring. According to the invention, the background influence of natural gamma-ray scattered photons (Compton effect) is reduced to the maximum extent. Meanwhile, the accuracy of the in-situ environment gamma-ray detection result is improved. The structure unit of the detector is simplified and the power consumption of a complete machine is lowered.

Description

technical field [0001] The invention belongs to the technical field of radiation detection equipment, and relates to an anti-Compton scattering detector. Background technique [0002] For a long time, the technology of "low-level radioactivity detection under high background conditions" has been concerned by scholars at home and abroad (H.Oeschger, 1975; Kenichi Nogami, 1978; TheórssonP.1991; Zheng Renqi, 1985, 1995; Li Deping, 1994; Huang Naiming, 2004; etc. ). Many scholars have done a lot of work on this problem from theoretical method research to measurement system development and application. The traditional monitoring method of low-level environmental radioactivity is "on-site sampling-laboratory analysis" (which is also the main method currently used in China), and the degree of on-site analysis technology is not high (Sha Lianmao, 2011), with poor timeliness and a lot of equipment used It is a large analytical instrument in the laboratory, which is not easy to carr...

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Problems solved by technology

[0006] The existing multi-probe combination detectors are in the form of array combination, while the form of nested combination of main and auxiliary detectors is relatively rare. Most of the existing nested combination detectors use high-purity germanium or lanthanum bromide semiconductor as the main detector. The scintillator detector used in the outer layer is used as an auxiliary detector. Since the working temperature (-188℃~-163℃) of the main detector in this combination is relatively strict, it is necessary to add a large volume and power cooling (such as electric refrigeration, mechanical Refrigeration, liquid nitrogen refrigeration, etc.) devices, so this type of design is mainly for laboratory analysis, not portable

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