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PRIMARY STANDARDIZATION OF THE MASSIC ACTIVITY OF A PROTACTINIUM-...

期一镤-233溶液中的MASSIC活性的主要标准化

【作       者】:

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【机       构】: 美国国家标准与技术研究院
【承研机构】:

【原文地址】: https://www.nist.gov/publications/primary-standardization-massic-activity-protactinium-233-solution
【发表时间】:

2018-08-23

摘要

Protactinium-233 (233Pa) is used as a tracer for radiochemical analysis and is of particular interest as an isotope dilution mass spectrometry (IDMS) spike for 231Pa/235U radio- chronometry. To this end, we present massic activity determinations by two methods for a 233Pa solution, which was prepared at Lawrence Livermore National Laboratory (LLNL) and is being characterized at multiple labs as part of a 231Pa reference material production project. One activity determination method was 4πβ-γ anti-coincidence counting in a multi-dimensional extrapolation model, with Monte Carlo corrections. An independent massic activity determination was completed by gamma-ray spectrometry using 5 HPGe detectors using 5 gamma-ray lines. The anti-coincidence and gamma-ray spectrometry results agree and have combined standard uncertainties of about 0.33 % and 1.0 % respectively. In addition, the two methods were combined to derive gamma-ray emission probabilities from 233Pa decay.

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