Laureano-Perez L, Collé R, Fitzgerald R, Zimmerman B E, Cumberland L
Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8462, USA.
Appl Radiat Isot. 2010 Jul-Aug;68(7-8):1489-94. doi: 10.1016/j.apradiso.2009.11.049. Epub 2009 Dec 5.
The standardization of (99)Tc by several primary methods was investigated. This was performed to support a new (99)Tc transfer standard that has been developed and will be disseminated by the National Institute of Standards and Technology (NIST) as Standard Reference Material SRM 4288B. The standardization for the (99)Tc content of the solution was based on 4pibeta liquid scintillation (LS) measurements with (3)H-standard efficiency tracing (CIEMAT/NIST method). Confirmatory determinations were performed by 4pibeta(LS)-gamma(NaI) live-timed anti-coincidence (LTAC) counting and an LS-based 4pibeta triple-to-double coincidence ratio (TDCR) method.
研究了几种主要方法对（99）Tc的标准化。这样做是为了支持一种新的（99）Tc转移标准，该标准已由美国国家标准与技术研究院（NIST）制定并将作为标准参考物质SRM 4288B发布。溶液中（99）Tc含量的标准化基于使用（3）H标准效率示踪的4πβ液体闪烁（LS）测量（CIEMAT/NIST方法）。通过4πβ（LS）-γ（NaI）实时反符合（LTAC）计数和基于LS的4πβ三到双符合比（TDCR）方法进行了确证测定。
