Peculiarities of intrinsic background in LaBr3: Ce and CeBr3 scintillating crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The intrinsic background was measured in LaBr3:Ce and CeBr3 scintillating crystals grown at the Institute of Solid-State Physics of the Russian Academy of Sciences. The measurements were taken in the range of gamma-ray energies from 20 keV to similar to similar to 5 MeV. Cylindrical samples with dimensions of 1.5 x 1.8 cm for LaBr3:Ce and 0.5 x 1.5 cm for CeBr3 were used. Well-known peculiarities due to the La-138 radioactive iso-tope and actinide contaminants were reproduced in the recorded background spectrum of the LaBr3:Ce crystal. The detailed spectrum of the intrinsic background in the CeBr3 crystal was measured for the first time. At energies of > 200 keV, the background rate of CeBr3 appeared to be much lower than that of LaBr3:Ce both in the continuum and in the peculiarities associated with the radioactivity of possible contaminants.