Radiation source position tracking system using multiple radiation spectroscopy detectors

초록

Gamma cameras are often used to detect and locate radiation sources. A gamma camera can acquire a 2D image to track the planar position. The use of a pinhole collimator or diverging collimators is essential to monitoring over a wide range; however, the sensitivity is very low and it takes a long time to track the position. To solve this problem, a system for tracking 2D positions using radiation spectroscopy detectors has been developed. Acquisition of planar images using the location measurement algorithm with radiation measured by spectroscopy detectors results in a significant improvement in sensitivity compared with a system using a gamma camera because a collimator is not used. However, if the radiation source is located at different heights on the same 2D plane, there is a limit to tracking the exact position, even with the positioning algorithm. To solve this problem, we designed a system to measure the 3D position using five radiation spectroscopy detectors. The principle of the system was the number of incident radiations to the same area was differently depending on the square of the distance, and the performance of the system designed was evaluated using Geant4 Application for Tomographic Emission (GATE). The average error was 2.03 +/- 2.39%, 2.20 +/- 2.92%, and 4.78 +/- 4.52% for the X, Y, and Z positions, respectively.

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