The evaluation of the 1001.03 keV gamma emission absolute intensity using fundamental parameter method

Publication date: December 2017
Source:Journal of Environmental Radioactivity, Volume 180
Author(s): A.E.M. Khater, Y.Y. Ebaid
The accurate evaluation of the absolute intensity of the gamma-ray transition 1001.03 keV of ^234mPa is crucial for accurate determination of ²³⁸U in nuclear material and environmental samples. Over the last decades, a wide range of 1001.03 keV absolute intensity values were published by different researchers and ranged from 0.59 to 1.12%. Nowadays, one of the most commonly used values is 0.847 ± 0.008% that seems not accurate and would eventually lead to an overestimation of ²³⁸U activity concentration. The absolute intensity of 1001.03 keV gamma transition was re-evaluated using different fundamental parameter method (FPM) modes, uranium ore and granite samples, samples' geometries, sample-to-detectors' geometries and gamma ray spectrometers. The mean ± standard deviation of newly optimized absolute intensity value is 1.067 ± 0.084% with an average relative bias of - 20% from the commonly used value.



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