Das Ansprechvermögen eines NaJ(Tl)-Szintillationskristalls im Energiebereich derK- undL-Absorptionskante des Jods (33,2 bzw. 5,2 keV) für Röntgenstrahlen

Abstract

The response of a Na I(Tl)-crystal to x-rays is measured in the energy region from 3 to 46 keV with a single channel pulse-height analyser. The x-rays of the different photon-energies are produced by excitation of fluorescence radiation of the elements potassium to dysprosium. A proportionality with energy results only in approximation. For photon-energies which correspond to the excitation level of theL- or theK-shell of iodine a minimum of the average pulse-height per unit energyH/E which is proportional to the scintillation efficiency occurs in the energy dependence. The response to electrons is deduced from the response to x-rays. The behaviour ofH/E for x-rays is attributed to the energy dependent scintillation efficiency of the Na I(Tl)-crystal for electrons.