通过使用冷过渡边缘传感器 (TES) 的衰变能量光谱法 (DES) 确定质量活动的考虑因素
M Carlson1, B Alpert1, D E Bergeron1
1National Institute of Standards and Technology (NIST), USA.
概括
使用冷过渡边缘传感器 (TES) 的衰变能量光谱 (DES) 可提供精确的放射性核酸量化. 新方法的不确定性低于1%,验证了DES的活动标准化.
科学领域:
- 核物理 核物理 核物理
- 计量学 计量学 计量学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 使用冷过渡边缘传感器 (TES) 进行衰变能量光谱 (DES) 是用于放射性核酸活性标准化的强大技术.
- 它的4π几何,高效率和分辨率允许精确量化,包括难以测量的杂质,而无需化学分离.
研究的目的:
- 开发和验证DES样品准备,TES芯片设计和数据分析的新方法.
- 为了应对精确的源沉积,脉冲堆积和脉冲形状变化的挑战,以实现初级标准化.
- 为了实现DES测量的1%以下的相对组合标准不确定性.
主要方法:
- 开发用于微克源沉积的新型DES样品准备技术.
- 实施先进的TES芯片设计和数据分析算法.
- 包括实时计时,死亡时间延长,并排除堆积,以准确计数.
- 纠正特定于DES数据采集的系统错误.
主要成果:
- 精确的质量活动和同位素比测量243Am来源与241Am杂质.
- 经过校正后,证明相对组合标准不确定性低于1%.
- 在DES和液体闪 (LS) 之间有很好的一致性,计算为243Am大质量活动 (ADES/ALS=1.000±0.005).
结论:
- 开发的方法显著提高了衰变能量光谱的准确性和可靠性.
- 作为一种能够达到高精度的初级标准化方法,DES得到了验证.
- 该技术显示出在核计量学和放射化学中常规应用的巨大潜力.
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