Positioning Method for a Radiation Source Using Radiation Spectroscopy Detectors

Abstract

A system consisting of a gamma camera and a collimator is used to measure the location of a radiation source in a space where people use it or in places where people are crowded. Systems with collimators require considerable time to measure the location of the radiation source due to their low sensitivity, while can be a problem when minimizing damage through rapid tracking of radiation sources. As a solution to this low-sensitivity problem, a method of tracking the location of a radiation source by using several spectroscopy detectors for the detection of radiation has been developed. Become a radiation spectroscopy detector does not use a collimator, the sensitivity can be significantly improved compared to that of a gamma camera system with a collimator, which in turn enables the quick identification of the radiation source. The position measurement method is based on the principle that the amount of detected radiation is inversely proportional to the square of the distance. By using several radiation spectroscopy detectors, it was possible to derive the unknown equations for distance and the distance calculation method for each axis by using these equations. The radiation was measured using a Geant4 Application for Tomographic Emission (GATE) simulation, and the accuracy of the position measurement was evaluated using the distance the calculation method.