Abstract
Abstract The x-,and gamma-ray emission probabilities per decay of Np-239 are determined directly from the ratio of the emission rates and the activity. The emission rates are measured with calibrated Ge(Li) spectrometer and activity with 4лβ-r coincidence counting device. The 277.6 keV r-ray emission probability is determined as 0.1421±0.0013. The errors of the measured results are carefully discussed and compared with the data offered by the literatures.
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