Method and device for measuring two-dimensional angle distribution of radiation dose rate of radioactive substance

Abstract

The invention brings forward a method and device for measuring two-dimensional angle distribution of the radiation dose rate of a radioactive substance. The method comprises: a gamma camera detecting gamma photons incident from each direction of a defining object angle plane in an object area, and respectively recombining to form projection data and power spectrum data; reconstructing the projection data by use of an image reconstruction algorithm to obtain a radiation gamma image; based on this, obtaining the two-dimensional angle distribution of the fluence rate of the gamma photons incident from each direction in the object area; and according to incident photon energy, searching for corresponding conversion coefficients, and by use of the conversion coefficients, converting the two-dimensional angle distribution of the fluence rate of the gamma photons into the two-dimensional angle distribution of the dose rate of radiation of the radioactive substance to the position of the gamma camera. The measuring method provided by the invention realizes measurement of the two-dimensional angle distribution of the radiation dose rate of the gamma photons incident from the different directions in the object area by use of such devices as the gamma camera and the like.

Description

technical field [0001] The invention relates to the technical field of radiation detection, in particular to a method and equipment for measuring the two-dimensional angular distribution of the radiation dose rate of radioactive substances. 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 is a method of detecting radioactive substances using radiation detection technology, detecting gamma photons incident from all directions of the target angular plane where the radioactive substances are located, and detecting the gamma photons coded...

AI Technical Summary

Problems solved by technology

However, the gamma radiation image itself can only reflect the two-dimensional angular distribution information of radioactive substances, but cannot reflect the two-dimensional angular distribution of the gamma radiation dose rate or particle fluence rate. The gamma radiation of the gamma camera in the prior art There are still relatively few technologies for measuring the two-dimensional angular distribution of dose rate or particle fluence rate and need to be developed

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