Abstract
Gamma-ray spectrometry measurements have been carried out to determine the activity of natural radionuclides in a phosphogypsum sample included in a specific tight container. The gamma spectrometer includes an N-type coaxial high-purity germanium (HPGe) detector equipped with an anti-cosmic system. This measurement required the determination of linear attenuation coefficients of phosphogypsum to calculate self-absorption correction between efficiency calibration conditions and measurement ones. The results are given for the three natural chains and for 40K, in term of specific activity/g of dry material, ranging from a few Bq kg −1 to a few hundreds Bq kg −1. The equilibrium within the different families and the 235U/ 238U ratio are discussed.
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