Ll. Nagornaya et al., A HIGHLY EFFICIENT ALPHA-SPECTROMETER, BETA-SPECTROMETER, GAMMA-SPECTROMETER WITH LOW-BACKGROUND, IEEE transactions on nuclear science, 43(3), 1996, pp. 1284-1286
A highly efficient low-background spectrometer based on phoswich detec
tor design and characteristics are described. The spectrometer allows
measurements in a broad energy range of alpha-, beta- and gamma-radiat
ion emitted from the natural radionuclides to be carried out. The phos
wich detector consists of a fast scintillator based on the doped p-ter
phenyl single crystal and a slow CWO scintillator. Separate detection
of each type of radiation is made possible by means of signal discrimi
nation over the pulse shape. The minimum detectable activity of Sr-90
+ Y-99 equal to 1 Bq was achieved. Advantages of the proposed spectrom
eter are discussed, and quantitative data on the minimum detectable ac
tivities for each type of radiation are presented.