The standardization of 188W/188Re by 4πβ liquid scintillation spectrometry with the CIEMAT/NIST 3H-standard efficiency tracing method

被引：7
|
作者：
Zimmerman, BE [1 ]
Cessna, JT [1 ]
Unterweger, MP [1 ]
机构：
[1] NIST, Phys Lab, Gaithersburg, MD 20899 USA
来源：
APPLIED RADIATION AND ISOTOPES | 2002年 / 56卷 / 1-2期
关键词：
beta-emitters; liquid scintillation counting; radioactivity; rhenium-188; standardization; tungsten-188;
D O I：
10.1016/S0969-8043(01)00207-X
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The massic activity of a solution containing W-188 in equilibrium with its daughter, Re-188, has been standardized by the National Institute of Standards and Technology using 4pibeta liquid scintillation counting with efficiency tracing using the CIEMAT/NIST method. Confirmatory measurements were carried out with gamma-ray spectrometry using high purity germanium detectors and a 4pigamma NaI(Tl) system. A calibration factor of 1.68 MBq pA(-1) +/- 0.03 MBq pA(-1) (expanded, k = 2, uncertainty) for the W-188 in the solution was determined, along with correction factors for activity determinations using Capintec dose calibrators. A half-life value of 69.78 d +/- 0.05 d (standard uncertainty) was determined by measurement in the NIST 4pigamma ionization chamber and is consistent with currently recommended values. Published by Elsevier Science Ltd.
引用
收藏
页码：315 / 320
页数：6
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