EFFTRAN—A Monte Carlo efficiency transfer code for gamma-ray spectrometry

An implementation of the efficiency transfer method for cylindrical samples in gamma-ray spectrometry is presented, based on a Monte Carlo integration of the interaction probabilities of gamma rays over the detector and sample volumes. This approach makes it possible for the computer code to be relatively straightforward to write and the speed of the calculation to be adequate for routine on-line analysis of gamma-ray spectra. Virtual components of the detector system are introduced to prevent any erroneous or double counting of gamma-ray paths, which simplifies the tracking algorithm.