使用高分辨率γ射线光谱测试审问混合动力胺篮:可能的走私场景的核法医观点
Sabyasachi Patra1, Agnes Maria Mani1,2, Satyam Kumar1
1Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
Analytical chemistry
|February 8, 2024
概括
在被扣押的核样本中准确地测试可裂变材料对于核法医学至关重要. 一种新的代方法改善了现场测量混合动力酸的量化,提高了走私材料的决策能力.
科学领域:
- 核取证科学是核取证的重要组成部分.
- 分析化学是一种分析化学.
- 放射化学 放射化学是指辐射化学.
背景情况:
- 准确估计被扣押核材料中的裂变物质含量对于核取证和法律诉讼至关重要.
- 高分辨率马射线光谱 (HRGRS) 提供了一种非破坏性的方法,用于在现场快速评估辐射威胁.
- 在异质矩阵中定量混合的动因化样本,由于不同的马射线衰减,存在重大挑战.
研究的目的:
- 为了应对异质核材料样本中可变衰减的挑战.
- 开发一种新的方法,用于在现场量化被扣押材料中混合的活性化物.
- 提高核取证调查的准确性和效率.
主要方法:
- 开发了一种代效率转移方法,从"点"模型过渡到"扩展"源模型.
- 这种方法解释了异质样本中各个子容器的不同马射线衰减.
- 该方法使用四个模拟样本和模拟被扣押核材料的旧包进行了验证.
主要成果:
- 对可裂变和其他放射性同位素的绝对同位素库存以<10%的准确度实现.
- 总 (U) 和 (Pu) 含量以<3%的准确度确定.
- 大多数同位素和元素的测量不确定性低于10%.
结论:
- 开发的代效率转移方法显示了在走私场景中进行现场核取证的巨大潜力.
- 这种方法有效地处理了异质混合动力样本的复杂性.
- 这种方法可以适应其他需要精确放射性同位素量化的各种应用.
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