Abstract
In this research, the conceptual design of an orphan gamma-ray finder based on a single NaI(Tl) scintillation detector in energy range of ∼50 keV to ∼3 MeV using Monte Carlo (MCNPX2.6) code has been presented. In the conventional finders, usually 2, 3 or more detectors are used. First, the system including three 2-in. NaI(Tl) scintillation detectors has been investigated. Based on the results, a newer approach to find the angular position of γ-ray orphan source for the system including only one 2-in. NaI(Tl) scintillation detector has been proposed. The height difference between an orphan source’s position and central axis of detector will decrease the precision of determining spatial location as well as activity calculation of the source. In this research, 3D localization of an orphan γ-ray source in a limited space using an electromechanical motorized laboratory jack has been enabled. This system can determine location and activity of an orphan source in distances of 2.0 m to 10.0 m from center of this system with activity of 3.77 × 106 Bq with relative errors less than 3% and 6%, respectively.
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