This paper demonstrates a new method for analyzing data from non destructive assay (NDA) measurements using gamma rays emitted by radioactive material. The method is based on observing differential attenuation of several different gamma ray energies from the same radionuclide. Two different methods are discussed: one for self-absorption within the source material and a second for attenuation of gamma rays by external shielding. The effectiveness of the method is demonstrated by analyzing data from NDA measurements of the hold-up of Pu-239 in decommissioned process tanks. Although the method was specifically applied to plutonium assay measurements, the technique can be applied to any radionuclide emitting several different easily measured gamma ray energies.
Revised: September 16, 2002 |
Published: December 1, 2000
Citation
Brackenbush L.W., D.L. Haggard, and J.E. Tanner. 2000.A new method to correct for gamma attenuation in NDA measurements for plutonium and other radionuclides. In Proceedings Of The Topical Meeting On Radiation Protection For Our National Priorities: Medicine, The Environment, And The Legacy, Spokane, Washington,September 17-21, 2000, 89-94. La Grange Park, Illinois:American Nuclear Society.PNNL-SA-31693.