通过液体闪烁计数法对镭活度进行初级标准化。
Primary standardization of Ra activity by liquid scintillation counting.
作者信息
Napoli Elisa, Cessna Jeffrey T, Fitzgerald Ryan, Pibida Leticia, Collé Ronald, Laureano-Pérez Lizbeth, Zimmerman Brian E, Bergeron Denis E
机构信息
Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA; Oncoinvent AS, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway; Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway.
Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA.
出版信息
Appl Radiat Isot. 2020 Jan;155:108933. doi: 10.1016/j.apradiso.2019.108933. Epub 2019 Oct 11.
A standard for activity of Ra in secular equilibrium with its progeny has been developed, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS) counting. The standard was confirmed by efficiency tracing and 4παβ(LS)-γ(NaI(Tl)) anticoincidence counting, as well as by 4πγ ionization chamber and NaI(Tl) measurements. Secondary standard ionization chambers were calibrated with an expanded uncertainty of 0.62% (k = 2). Calibration settings were also determined for a 5 mL flame-sealed ampoule on several commercial reentrant ionization chambers (dose calibrators).
基于三重与双重符合比（TDCR）液体闪烁（LS）计数法，制定了镭与其子体处于长期平衡状态时的活度标准。该标准通过效率追踪、4παβ（LS）-γ（碘化钠（铊））反符合计数法以及4πγ电离室和碘化钠（铊）测量法得到了验证。二级标准电离室的校准扩展不确定度为0.62%（k = 2）。还确定了几种商用重入式电离室（剂量校准仪）对5 mL火焰密封安瓿的校准设置。
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