Radioactive substance detection method, device and system based on gamma camera

Abstract

The invention provides a radioactive substance detection method, a radioactive substance detection device and a radioactive substance detection system based on a gamma camera. The detection method comprises the following steps of: receiving gamma photons incident from all directions of a target angle plane (alpha, beta) defined by radioactive substances by using the gamma camera; generating gamma photon energy spectrums and projection data of the radioactive substances; and reconstructing the projection data by using a 'maximum likelihood estimation' statistical iterative algorithm to obtain a gamma radiation image with quantitative information. By the method, the spatial resolution and the signal to noise ratio of the gamma radiation image are increased, spaces of the radioactive substances are positioned, the radiation dose is measured, nuclide types of the radioactive substances are identified, and the radioactive activity is measured.

Description

technical field [0001] The invention relates to the technical field of radiation detection, in particular to a method for detecting radioactive substances based on a gamma camera, a device and a system thereof. Background technique [0002] The location of radioactive substances, radiation dose measurement, nuclide type identification and activity measurement have a wide range of applications in the fields of nuclear industry, nuclear safety, environmental protection, industrial and medical radioactive source management, and public safety. [0003] Traditional methods used to detect radioactive substances mainly include: dosimeters, gamma spectrometers and gamma cameras. Among them, the gamma camera realizes the two-dimensional plane distribution imaging of radioactive substances by detecting the gamma photons collimated by the collimator. Moreover, the gamma camera also has the function of measuring the gamma radiation dose rate or particle fluence rate at the position of ...

AI Technical Summary

Problems solved by technology

However, in the prior art, when the gamma camera and the visible light camera have different optical paths, the precise registration and fusion of the visible light image and the gamma radiation image of the radioactive substance cannot be realized for the radioactive substance whose distance from the equipment is unknown; When the gamma camera and visible light camera are in the same optical path, gamma radiation imaging and visible light imaging cannot be performed at the same time

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