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The re-evaluation of the 234m Pa's 1001.03 keV gamma emission absolute intensity for the precise assessment of 238 U.
Journal of Environmental Radioactivity 2017 April
In this study the commonly used f-value for the 1001.03 keV (0.835 ± 0.004%) energy transition of the 234m Pa was re-evaluated due to an obvious consistent overestimation of the 238 U activity concentration. Different calibration protocols, samples' matrices and geometries, and gamma-ray spectrometers were exploited in order to assure the accuracy of the derived data. An average positive relative bias of about 24% from the currently used f-value was estimating leading to newly adopted f-value of 1.037 ± 0.052%. This newly suggested f-value will lead to an improvement in the accurate assessment process of the 238 U using gamma-ray spectrometry in both environmental and nuclear safeguard fields.
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