Effect Evaluation by Activity and Geometry Difference in Calibration on LSC

LSC 장비를 이용한 교정시 Activity 및 Geometry 차이에 의한 영향 평가

  • Han, Sang-Jun (Department of Nuclear Engineering, Chosun University) ;
  • Lee, Kyung-Jin (Department of Nuclear Engineering, Chosun University) ;
  • Lee, Seung-Jin (Yeong-Gwang NPP Supervisory Center for Environment Radiation & Safety) ;
  • Kim, Hee-Gang (Yeong-Gwang NPP Supervisory Center for Environment Radiation & Safety) ;
  • Park, Eung-Seop (Yeong-Gwang NPP Supervisory Center for Environment Radiation & Safety)
  • Published : 2008.03.31

Abstract

When the calibration on Liquid Scintillation Counter using the Solid $^3H$ Standard Source of 200,000DPM is executed, the uncertainty due to activity and geometry difference, exists. Therefore, this paper intends to evaluate environmental samples comparatively accurately as decreasing this uncertainty existing in the process of calibration. For this, measurements on samples manufactured by $^3H$ Standard Source and sensitivity study were performed. Also, this paper verified calibration results using Radioactivity-Error-Analysis Method, and evaluated quantitatively the effect by geometry and activity difference based on verification result. According to the result of sensitivity study, in case of using the exposure time of 75 sec and Repeat method, the measuring accuracy and precision of about $1{\sim}3%$ were increased in comparison with the existing method. By analysis result, the effect by activity difference did not appear, and a plastic cell existing into Teflon vial made a role as reflector. The less the effect of plastic cells are decreased, the more activity is high, and the effect of those can be neglected at the activity of 200,000 DPM.

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