A new analytical method to calibrate cylindrical phoswich and LaBr3(Ce) scintillation detectors

A new analytical method of efficiency calibration is proposed for cylindrical phoswich and lanthanum bromide (LaBr3:Ce) scintillation detectors. This method depends on the accurate analytical calculation of two important factors: the path length d, the photon traverses within the active volume of a gamma detector, and the geometrical solid angle Ω, subtended by the source to the detector at the point of entrance. In addition, the attenuation of photons by the detector housing materials is also treated by calculating the photon path length through these materials. The comparisons with the experimental and Monte Carlo method data reported in the literature indicate that the present method is useful in the efficiency calibration of the cylindrical phoswich and lanthanum bromide (LaBr3:Ce) scintillation detectors.