Gamma-ray emission probabilities of the daughters of 238U

Suggested Modification of the Fundamental Parameter Method: A Case Study to Calculate the Optimum Absolute Intensity of 1001.03 keV Gamma-Ray Transition-

“…The accurate determination of 238 U using 234m Pa gamma-ray transition of 1001.03 keV depends on different parameters such as full energy photopeak efficiency (ε) and absolute intensity (I%). One of the most critical parameters is I% that has been evaluated using different analytical techniques and varied from 0.59±0.1% up to 1.12±0.067%) [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The most recent published I% value was 1.037 that was about 20% higher than the commonly used value 0.847± 0.008 [15,36,41].…”

“…Among all the ruling factors affecting the accuracy of gamma-ray spectrometry, I % relatively overcomes the significance of other parameters. Over decades, various studies have been performed in order to accurately evaluate I% of 1001.03 keV gamma-ray transition that varies widely from 0.59% up to 1.12% [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Furthermore, recent studies have suggested that there is a noticeable under estimation of the currently used I% of 1001.03 keV gamma-ray transition.…”

Use of the 1001keV peak of 234mPa daughter of 238U in measurement of uranium concentration by HPGe gamma-ray spectrometry

“…It is worth noting that the 1001 keV peak of Pa daughter of U is the most clean and suitable gamma emission for the analytical purposes because approx. 0.9987 of the Pa betadecay feeds the ground state of U directly, the remaining beta branches, together with any gamma-rays and conversion lines are weak [15]. In addition, the 766 keV (0.207%) gamma-ray of Pa cannot be considered useful for the measurement of U (via Pa).…”

“…The 1001 keV peak does not include any contribution from any other gamma emissions, and does not have any interference with other peaks in the region of interest. Besides this, in surveying of literature, several recent gamma-ray measurements of the absolute emission probability of the 1001 keV peak of Pa have resulted in giving a newly recommended value of 0.835%, and this new value provides a consistent basis for measurement of Pa in the samples [15]. The results obtained from the 63.3 keV peak of Th for the Certified Reference Materials (CRM) are compared with those of 1001 keV peak from Pa for the same materials.…”

Uranium Isotopic Analysis with the FRAM Isotopic Analysis Code

“…the BRs for 238U are from Ref. 7, except the br of the 258-kev gamma ray, which was adjusted to match the databetter.…”