Scintillator array detector and three-dimensional position resolution method in Compton scattering imaging

Abstract

The invention discloses a scintillator array detector and a three-dimensional position resolution method in Compton scattering imaging. The method comprises the following steps: 1) enabling gamma photons to be incident to the scintillator array detector; 2) determining two-dimensional coordinate information (X, Y) of the action position of the gamma photons in the scintillator array according to the number of the responded photodetector pixel in the photodetector array; and 3) determining third-dimensional coordinate information Z of the action position of the gamma photons in the scintillatorarray according to the amplitude ratio f=X1 / (X1+X2) of output signals (X1, X2) of the responded light detector and a lookup table obtain three-dimensional coordinates (X, Y, Z) of the action positionof the gamma photons, wherein X1 and X2 are corresponding top surface and bottom surface optical detector output signals when gamma photons act on the scintillator strip detection unit i. According to the invention, the detection efficiency of a Compton camera and the imaging precision of the nuclear radiation hot spot are improved.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection and nuclear technology application, in particular to a scintillator array detector and a three-dimensional position resolution method in Compton scattering imaging. Background technique [0002] In the field of nuclear radiation detection, applications such as nuclear monitoring, nuclear security and nuclear emergency need to obtain the distribution of nuclear radiation hotspots in the environment. At present, there are mainly two technical methods for measuring nuclear radiation hotspots: one is to provide nuclear radiation information (including energy spectrum, dose, etc.) at the measurement point through dosimeters and gamma spectrometers. Determine the location of nuclear radiation hotspots; the second is to provide a two-dimensional image of the distribution of nuclear radiation hotspots through gamma cameras (including pinhole cameras, coded hole cameras, Compton cameras, etc.). ...

AI Technical Summary

Problems solved by technology

This solution does not require the use of collimated radiation sources for pre-calibration, but the multi-segment cutting method is often not accurate enough, and there are process control problems in the production of pixel-type scintillator strips, which may easily lead to poor coupling and poor resolution.

[0008] The above method for sensitive detection of three-dimensional position in Compton scattering imaging, the obtained DOI resolution and three-dimensional position resolution still need to be improved

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