Abstract: The technique of virtual calibration has been widely applied to field of calibration of the radiation detector. In this paper, the dimensions of the LaBr₃ detector were adjusted based on the point-source experiments with Monte Carlo method. A series of full-energy peak efficiency of the detector were then simulated in different positions. The results of the validation experiment showed that the relative deviations between calculated efficiencies and measurement values are within ±5% in the energy range of 121—1 332 keV.

Key words: LaBr₃ scintillation detector, Monte Carlo method, crystal adjustment, efficiency calibration