Gamma detection system and method and handheld gamma detection device

Abstract

The invention provides a gamma detection system comprising a detection module used for receiving incident gamma photons and obtaining position information, energy information and counting information M of the gamma photons; the processing module is used for counting gamma photons within a certain time to obtain projection distribution data p of the gamma photons, determining energy E of incident photons according to an energy spectrum obtained by counting the energy information, reading pre-stored left and right singular matrixes V and UT and a diagonal matrix S according to the energy E, and determining a singular value retention number N according to counting information M; the reconstruction module processes the diagonal matrix S according to the singular value retention number N, completes generalized inverse matrix C + calculation of the transmission matrix C of the detection module according to C + = VS + UT, and obtains a reconstructed image through calculation according to f = C + p; and the display module is used for displaying the reconstructed image f and the energy spectrum and counting information M of the incident gamma photons. According to the invention, gamma radiation reconstruction imaging can be rapidly realized, the calculated amount is small, and small hardware circuit integration is facilitated.

Description

technical field [0001] The present disclosure relates to the technical fields of nuclear technology, nuclear application and nuclear medicine, and in particular, to a gamma detection system, method and handheld gamma detection device. Background technique [0002] Nuclear radiation detection equipment is widely installed and used in industries, nuclear power plants, hospitals, environmental protection, transportation hubs and other fields. Among them, for the purpose of security inspection in densely populated places, fixed channel-type equipment, such as door detectors, is generally selected, combined with hand-held radiation dosimeters, to perform carpet screening on people or objects again. These devices tend to alarm quickly, but because they cannot be positioned visually, it is difficult to quickly give accurate radioactive material distribution, resulting in difficulties in finding and accurately locating radioactive sources. Considering that during routine security i...

AI Technical Summary

Problems solved by technology

However, although the existing nuclear radiation equipment based on coding plate imaging or the principle of Compton scattering can quickly lock the radioactive source, the price is usually relatively expensive, and the volume and weight are relatively large, which is not conducive to popularization and use.

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