Accelerator mass spectrometry of plutonium isotopes
Accelerator mass spectrometry of plutonium isotopes
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DOI：
10.1016/0168-583x(96)00287-x
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发表时间：
1996-09-01
影响因子：
1.3
通讯作者：
Priest, ND
中科院分区：
文献类型：
--
作者：
Fifield, LK;Cresswell, RG;Priest, ND
已经证明了通过加速器质谱法测量钚同位素比的可行性。对已知成分的测试样品和空白的测量表明，可以定量确定同位素比率，并且 AMS 目前的检测限与钚的 10(6) 原子相似。对于 Pu-239，该限制比 α 能谱测定法的实际限制至少低两个数量级。此外，还测量了四个样品的 Pu-240/Pu-239 比率，之前已通过 α 计数确定了这四个样品的两种同位素的组合活性。所有钚同位素比的测量都需要将 PuO- 注入以 3.5 MV 运行的 14UD 加速器中，进行气体剥离，并分析加速后的 7(+) 电荷态，在纵向场电离室中检测到 28 MeV 的钚离子，能量分辨率为 3%。使用氧化铀作为氧化钚的替代物，结果表明 UO- 是主要的负离子，其形成和提取的概率为 0.3%。
The feasibility of measuring plutonium isotope ratios by accelerator mass spectrometry has been demonstrated. Measurements on a test sample of known composition and on a blank showed that isotope ratios could be determined quantitatively, and that the present limit of detection by AMS is similar to 10(6) atoms of plutonium. For Pu-239, this limit is at least two orders of magnitude lower than that practicable by alpha-spectrometry. In addition, Pu-240/Pu-239 ratios were measured for four samples for which the combined activity of the two isotopes had been determined previously by alpha-counting. All measurements of plutonium isotope ratios entailed injection of PuO- into the 14UD accelerator operating at 3.5 MV, gas stripping, and analysis of the 7(+) charge state after acceleration, Plutonium ions at 28 MeV were detected in a longitudinal-field ionisation chamber with an energy resolution of 3%. Using uranium oxide as a surrogate for plutonium oxide, it was shown that UO- was the predominant negative ion and that the probability for its formation and extraction was 0.3%.