PRECISION MEASUREMENTS OF GAMMA-RAY INTENSITIES AND ENERGIES IN DECAY OF EU152G,154 CO-56 AG-110M AND SB-125

With the aid of a computarized program the relative intensities of the prominent transitions present in the decay of 152g, 154Eu, 56Co, 110mAg and 125Sb have been calculated with very high precision. The energy values of the same transitions in the 152g, 154Eu, 110mAg and 125Sb decays were also determined, very precisely, so that each of these sources, could be employed both for energy calibration measurements, and for linearity calibration of multichannel analysers. The measurements were performed with two Ge(Li) coaxial detectors with active volume of 5.3 cm3 and 30 cm3, respectively. It is shown that with the aid of these radioactive sources, one can construct a very precise efficiency curve for any other Ge(Li) detector from 100 keV to 3500 keV and reproduce to within 2%-3% the well measured gamma ray relative intensities in sources as 22Na, 207Bi, 88Y, 133Ba and ThC″. For these latter measurements a third Ge(Li) coaxial detector, with active volume of 32 cm3, was employed. © 1969.