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| Construction and Implementation of a Liquid Scintillation TDCR System |
| WU Yong-le1,2,LIANG Jun-cheng3,LIU Hao-ran2,3,LIU Jia-cheng2,3,YAO Shun-he2,YUE Hui-guo1,LIU Sen-lin2,YANG Yuan-di3,YUAN Da-qing2 |
1. Nuclear and Radiation Safety Center, Beijing 100082, China;
2. China Institute of Atomic Energy,Beijing 102413, China;
3. National Institute of Metrology, Beijing 100013, China |
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Abstract The liquid scintillation triple-to-double coincidence ratio (TDCR) system recently constructed is presented. In order to eliminate the influence of after pluses and thermal noises, the technology of discrimination threshold setting, coincidence counting and extendible dead time is in application. The highest efficiency of tritium water, 14C and 99Tc is about 54%， 96.2% and 97.2% separately. The NIST SRM of tritium water is measured to verify the performance of the counter, and the result agreed well with certified activitiy value with En criterion.
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2014, Vol. 35 
