Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 65(1): 1-5 (2016)


CIEMAT/NIST法及びTDCR法による14Cの放射能測定Standardization of 14C by CIEMAT-NIST Method and TDCR Method

1国立研究開発法人産業技術総合研究所National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology ◇ 305–8568 茨城県つくば市梅園1–1–1中央第21–1–1 Umezono, Tsukuba-shi, Ibaraki Pref. 305–8568, Japan

2公益社団法人日本アイソトープ協会Japan radioisotope association ◇ 113–8941 東京都文京区本駒込 2–28–452–28–45 Hon-Komagome, Bunkyo, Tokyo 113–8941, Japan

受付日:2015年3月27日Received: March 27, 2015
受理日:2015年11月9日Accepted: November 9, 2015
発行日:2016年1月15日Published: January 15, 2016


In this study, standardization of 14C is carried out using the CIEMAT/NIST method with a conventional liquid scintillation counter, which is the national standard, and a triple-to-double coincidence ratio (TDCR) counter developed by the National Institute of Advanced Industrial Science and Technology (AIST). An efficiency calculation for the CIEMAT/NIST method was conducted by the program CN2004. The TDCR calculation was conducted at AIST using a custom-made program. The activity measured by the TDCR counter was in good agreement with that measured by the conventional national standard within the given uncertainties. These two measurement methods will be used for calibration services at AIST according to the purpose.

Key words: Standardization; CIEMAT/NIST; TDCR; Liquid scintillation counter

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