Age-Dating of Highly Enriched Uranium by Gamma Spectroscopy
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Graphical Abstract
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Abstract
The age of uranium samples are measured through the radioactivity ratio of 214Bi/234U by gamma spectrometry. The principle of measurement for radioactivity ratio of 234U/235U, 234U/235U and 214Bi/238U using intrinsic efficiency calibration is discussed. The measurement is a nondestructive assay method for uranium age-dating by gamma spectrometry which is applicable to materials in any physical form and geometrical shape. Two different physical form and geometrical shape samples are measured and investigated, one is U3O8 powder, the other is uranyl nitrate. The measurement results are 27.25 and 18.00 a respectively. For the uranyl nitrate sample, the relative standard deviation of highly enriched uranium (HEU) age determination is less than 5% between the measured and declared age.
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