Abstract
With increasing demand in the nuclear technology field for locating isolated radioactive sources, numerous studies have focused on the array detector. Given the concerns over the limited performance that only determined the horizontal direction of traditional direction algorithms, an improved algorithm based on the two-dimensional (2D) array detector is proposed for determining the gamma-source direction in the full 2π hemisphere field of view. Coupling a 2 × 2 Cesium Iodide Thallium [CsI(Tl)] crystal array with a silicon photomultiplier array, a prototype of the array detector was designed and implemented. For verification of its directional performance, Geant4 simulations and experiments were performed. The results verified that the detector is capable of simultaneously determining the horizontal and vertical direction of gamma-ray source with an accuracy around 1∘∼5∘. In addition, the simulation results showed that the detector can determine the direction of gamma-ray sources with a wide energy range from 30 keV to 3000 keV.
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