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KMID : 0364920080330010021
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Journal of Radiation Protection and Research
2008 Volume.33 No. 1 p.21 ~ p.26
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Effect Evaluation by Activity and Geometry Difference in Calibration on LSC
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Han Sang-Jun
Lee Kyung-Jin
Lee Seung-Jin
Kim Hee-Gang
Park Eung-Seop
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Abstract
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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 1~3% 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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KEYWORD
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Liquid Scintillation Counter, Sensitivity Index, Activity Difference, Geometry Difference
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