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-123的标准化和参与比较BIPM.RI(II) -K4.I-123的参与

W M van Wyngaardt¹, A H H Bowan¹, M Zarifi¹

¹Australian Nuclear Science and Technology Organisation, New Illawarra Rd, Lucas Heights, 2234, NSW, Australia.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

|July 3, 2025

概括

这项研究使用先进的计数技术对-123 (I-123) 进行了标准化,对杂质和腐烂进行了校正. 开发的初级标准提高了-123放射性测量的准确性.

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:

对-123 (I-123) 的准确标准化对于核医学应用至关重要.
现有的标准化方法需要改进,以考虑复杂的衰变方案和杂质.
参与国际关键比较需要强大的初级标准.

研究的目的:

开发和验证用于-123的主要标准使用4π(e_A,X) -γ实时反巧合计数技术.
通过对放射性杂质和探测器死亡时间进行校正,准确量化-123活性度.
为澳大利亚国家测量研究所 (ANSTO) 参与国际计量比较建立可靠的标准.

主要方法:

标准化-123使用4π(e_A,X) -γ实时反巧合计数与液体闪 (LS) 为4π通道.
在100天内扩展LS来源的计数,以追踪和纠正杂质 (I-125,Te-121,Te-123m).
权重最小平方回归分析与第三次多项式合并和推算以确定源活动,纠正背景,活时间,杂质和衰变.

主要成果:

开发的初级标准实现了对-123标准化的高准确度.
通过将扩展衰变数据与组件放射性核素衰变函数相匹配来确定不纯度校正因子.
通过一阶多项式匹配确定的活动度比最终结果高1.02%.
-123测量的标准不确定性被重新评估为0.53%.

结论:

4π(e_A,X) -γ反巧合计数技术为-123标准化提供了一种可靠的方法.
准确的杂质校正和非线性推断对于精确的放射性测量至关重要.
开发的初级标准符合国际关键比较的要求,增强了澳大利亚的计量能力.

关键词:

4π(e(A),X) -γ反巧合计数的计数在I-123中,我们可以看到在I-125中,我写了一封信.液体闪计数计算液体闪计数在 Te-12121 中使用.在 Te-123mm 中.

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