[논문]Comparative Study of Tritium Analysis Method with High-Volume Counting Vial

Yoon, Yoon Yeol; Kim, Yongcheol

doi:10.14407/jrpr.2020.45.3.142

[국내논문] Comparative Study of Tritium Analysis Method with High-Volume Counting Vial 원문보기

Journal of radiation protection and research, v.45 no.3, 2020년, pp.142 - 146

Yoon, Yoon Yeol (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources) , Kim, Yongcheol (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)

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Background: Tritium (3H) analysis in groundwater was difficult because of its low activity. Therefore, the electrolytic enrichment method was used. To improve the detection limit and for performing simple analysis, a high-volume counting vial with the available liquid scintillation counter (LSC) was investigated. Further, it was compared with a conventional 20-mL counting vial. Materials and Methods: The LSC with the electrolytic enrichment method was used 3H analysis in groundwater. A high-volume 145-mL counting vial was compared with a conventional 20-mL counting vial to determine the counting characteristics of different LSCs. Results and Discussion: When a Quantulus LSC was used, the counting window between channels 35 and 250 was used. The background count was approximately 1.86 cpm, and the counting efficiency increased from 8% to 40% depending on the mixing ratio of the volume of sample and cocktail solution. For LSC-LB7, the optimum counting window was between 1 and 4.9 keV, which was selected by the factory (Hitachi Aloka Medical Ltd., Japan) by considering quenching using a standard external gamma source. The background count of LSC-LB7 was approximately 3.60 ± 0.29 cpm when the 145-mL vial was used and 2.22 ± 0.17 cpm when the 20-mL vial was used. The minimum detectable activity (MDA) of the 20-mL vial was greater for LSC-LB7 than for Quantulus. The MDA with the 145-mL vial was improved to 0.3 Bq/L when compared with the value of 1.6 Bq/L for the 20-mL vial. Conclusion: The counting efficiency when using the 145-mL vial was 27%, whereas it was 18% when using the 20-mL vial. This difference can be attributed to the vial volume. The figure of merit (FOM) of the 145-mL vial was four times greater than that of the 20-mL vial because the volume of the former vial is approximately seven times greater than that of the latter. Further, the MDA for 3H decreased from 1.6 to 0.3 Bq/L. The counting efficiency and FOM of LSC-LB7 was slightly less than those of Quantulus when the 20-mL vial was used. The background counting rate of the Quantulus was lower than that of the LSC-LB7.

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In this study, we used 145 mL vial available LSC for analyzing natural level tritium and electrolytic enrichment method was also applied for extremely low activity tritium measurement. And ³H analysis was compared with two kinds of LSC and counting vials.

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Tritium was analyzed with two kinds of LSC, one is Quantulus 1220 (PerkinElmer Inc., Waltham, MA, USA) and the other is AccuFLEX LSC-LB7 (Hitachi, Tokyo, Japan), and counting performance was compared with 20 mL and 145 mL Teflon lined polypropylene vial. These two instrument used guard counter for reducing the effects of external radiation, anti-coincidence signal detection and massive layer of lead but LSC-LB7 has been realized by the unique detector structure for counting with the vial up to 145 mL as well as 20 mL [11–13].

참고문헌 (14)

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[국내논문] Comparative Study of Tritium Analysis Method with High-Volume Counting Vial 원문보기

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[국내논문] Comparative Study of Tritium Analysis Method with High-Volume Counting Vial 원문보기

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