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本文介绍了用γ能谱法精确测定浅燃耗钚样品的同位素丰度和~(241)Am相对含量的方法和实验结果。在38—60 keV钚的低能γ射线和203—208 keV两个能区中获取数据。选择不同同位素能量相近的γ射线对计算同位素丰度比,并对这些γ射线对的小的能量差别进行了仔细的效率修正,~(238)Pu,~(239)Pu,~(240)Pu,~(241)Pu丰度和~(241)Am相对含量的精度分别为±4.1%,±0.04%,±0.37%。±0.45%和±0.40%。与质谱仪测得结果相比,在误差范围内相互符合。
In this paper, the methods and experimental results of accurate determination of isotopic abundance and relative content of ~ (241) Am in light-burnup plutonium samples by γ-energy spectrometry are introduced. Data were obtained from the low energy γ-rays of 38-60 keV plutonium and the two energy regions of 203-208 keV. The isotope abundance ratios were calculated by using γ-ray pairs with similar isotopic energies, and the small energy differences of these γ-ray pairs were carefully corrected for efficiency. The results showed that ~ (238) Pu, 239 Pu and 240 Pu The accuracy of ~ (241) Pu abundance and ~ (241) Am relative content were ± 4.1%, ± 0.04% and ± 0.37%, respectively. ± 0.45% and ± 0.40%. Compared with the results measured by the mass spectrometer, they are within the error range.