Response characteristics of thin film detectors to fission fragments

Abstract

The dependence of the pulse height spectrum of a thin film detector (TFD) for fission fragments of 252Cf spontaneous fission on the thickness of scintillator film of the TFD was studied experimentally. The scintillator films used in the experiments were about 50, 100, 200 and 300 μg/cm 2 in thickness. The ratio of the yield of the heavy fragment peak to that of the light fragment peak became smaller as the film became thinner. The experimental result of the pulse height spectrum was analyzed by a luminescence production model which the present authors recently reported. The pulse height spectrum was represented satisfactorily by this model. The dependence of the pulse height spectrum on the incident beam position in the scintillator film was also investigated.