Abstract
Absolute X-ray and gamma-ray emission probabilities in the decay of 51Cr and 88Y have been determined using sources made from standard solutions. The activities of the radionuclides were determined using the KX-gamma-coincidence technique with NaI(Tl) scintillation counters of different thicknesses. The uncertainty in the activity measurements was 0.2%. The X-ray emissions from the 51Cr and 88Y sources were determined by the defined solid-angle method using a NaI(Tl) crystal. A 2π proportional counter was also used to study 51Cr decay, while the emission probability of the 320 keV gamma-ray of 51Cr was measured by the defined solid-angle method using a scintillation detector and a calibrated HP Ge spectrometer.
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