EMISSION PROBABILITIES OF L X-, K X- AND GAMMA-RAYS IN THE 10-130 KEVRANGE FOLLOWING THE DECAY OF PU-239

X- and gamma-ray emission probabilities in the 10-130 keV range were a ccurately measured for Pu-239 using calibrated Ge detectors. Data belo w 60 keV are essential for the development of environmental and contam ination measurement techniques; data above 60 keV are required mainly for nondestructive analyses applicable to nuclear material safeguards. X- and gamma-ray spectra were obtained from an electroplated Pu-239 s ource With an activity of 0.5 MBq using calibrated collimated planar-G e and coaxial-Ge detectors. An additional electroplated source of 3 MB q Pu-239 was counted to improve the spectrum analysis in the K X-ray r egion. L and K X-ray peaks were fitted to Voigt functions while gamma- ray peaks were described by Gaussian functions; anomalous K X-ray line shapes were observed from the decay of Pu-239. The principal X- and g amma-ray emission probabilities were determined with an uncertainty of 1% or better. For example, the following results were obtained for Pu -239: L(total) X-rays = (4.67 +/- 0.05) X 10(-2), K-alpha X-rays = (1. 219 +/- 0.009) X 10(-4), 38.7 keV gamma-ray = (1.044 +/- 0.013) X 10(- 4) and 129.3 keV gamma-ray = (6.31 +/- 0.03) X 10(-5).