Abstract
We present a Monte Carlo calculation to determine efficiencies and response functions of organic scintillators when used as gamma-rays detectors. The calculation is also valid for high energy gamma-rays and for finite dimensional sources because the primary gamma-rays, the secondary electrons and their bremsstrahlung radiation are followed both in the source and in the detector. To well reproduce the response functions, particularly in the case of large dimensional scintillators, the calculation takes also into account the phenomena related to the absorption and reflexion of the scintillation light in its way to the photocathode, together with the finite resolution of the photomultiplier. Results obtained for NE 213 organic scintillator detectors are shown.
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