巧合
重合计数
液体闪烁计数
物理
NIST公司
标准不确定度
核物理学
放射化学
γ射线光谱法
化学
测量不确定度
医学
替代医学
病理
量子力学
自然语言处理
计算机科学
作者
C.J. da Silva,Paulo Alberto Lima da Cruz,Akira Iwahara,Estela Maria de Oliveira,J. Loureiro,Luiz Tauhata,Ronaldo L. da Silva,R. Poledna,Ricardo Tadeu Lopes
标识
DOI:10.1016/j.apradiso.2017.10.009
摘要
In this work, a 68(Ge+Ga) solution has been standardized at the National Institute of Ionizing Radiation Metrology (LNMRI), in Brazil, in the frame of an international key comparison CCRI(II)-K2.Ge-68 piloted by National Institute of Standards and Technology (NIST/USA). The 4πβ(LS)-γ(NaI(Tl)) anticoincidence method with live-time and extended dead-time was used and its result was validated by 4πβ(LS)-γ(NaI(Tl)) coincidence counting and liquid scintillation counting using the Triple to Double Coincidence Ratio (TDCR) method. The deviations of the activity concentration values of coincidence and TDCR measurements from the anticoincidence result were 1.7% and 0.63%, respectively, which were within experimental evaluated uncertainties at ~95% level of confidence (coverage factor k = 2). The combined relative standard uncertainties were 0.65%, 0.70% and 0.53% for anticoincidence, coincidence and TDCR methods, respectively. These values are consistent with the results reported by Cessna at the ICRM2017 conference.
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