• Title/Summary/Keyword: 액체섬광계수기

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지하수중의 환경방사능 측정과 응용연구

  • 윤윤열;조수영;이길용;김용제
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2004.09a
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    • pp.142-146
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    • 2004
  • 지하수중에 존재하는 극미량의 환경방사성 동위원소를 측정하기 위한 방법을 개발하였다. 각 핵종들중 234U, 238U, 222Rn, 226Ra은 섬광액을 포함한 용매추출법을 사용하여 개별분리한 후 액체섬광계수기를 사용하여 각 핵종에서 방출되는 알파선을 검출하였다. 환경방사성 원소인 U과 Th 딸핵종의 비평형에 의한 지하수 특성 연구를 위해서 국내 지하수 중의 234U와 238U의 방사능비 측정을 대전 화강암 지역에서 채취한 지하수 시료를 ICP/MS를 사용하여 U 함량을 결정하고, 지하수에서 U을 용매추출한 후 알파전용 액체섬광계수기를 사용하여 234U와 238U의 방사능을 측정하였다.

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Study on Concentration Variation of 222Rn for Various Scintillators Using Low-Level Liquid Scintillation Counter (저 준위 액체섬광계수기를 이용한 섬광체 종류에 따른 222Rn 농도 변화 연구)

  • Jeon, JaeWan;Lee, Deuk-Hee;Kim, Jin-Seop
    • Journal of the Korean Society of Radiology
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    • v.13 no.6
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    • pp.847-856
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    • 2019
  • The various environmental issues arose with the development of today's economy. naturally, people were increased interest in environment and the importance of research on drinking water and contamination are emerging especially. A number of country areas, uranium and 222Rn in ground water have been detected to people using as drinking water. So this study evaluated the way for more accurate measurements than when measuring 222Rn concentrations in the ground water containing. the experiment was performed using the low-level liquid scintillation counter with an alpha, beta analysis easy PSA function of pulse. the scintillator as the preparation of the ground water samples are mixed, the measure value detection is lowered over prepare period and expiration date. Energy spectrum was also moved to a lower side channel. As a long time to buy the scintillator and over time after opening, it was confirmed that detection is lowered. if the purpose is to use a different scintillator can see the energy through the channel change.

Study on the Radiocarbon Dating with Liquid Scintillation Counting (액체섬광계수법을 이용한 방사성탄소 연대측정법 연구)

  • Kim, Nak Bae;Woo, Hyung Joo;Hong, Wan;Cho, Soo Young
    • Analytical Science and Technology
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    • v.5 no.4
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    • pp.381-387
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    • 1992
  • Optimum counting condition of a low level liquid scintillation counter for radiocarbon dating has been determined to minimize the contribution of tritium activity and get the highest FOM by the variation of scintillation solutions, scintillation solution to benzene ratio, and ${\beta}$-ray spectrum counting ranges. Under the condition, background count rate has been reduced to $2.26{\pm}0.03cpm$, and the maximum measurable age reached to about 40,000 years. And the practicality of counting system has been verified by the analysis of shell and peat samples.

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Optimal Method of Radon Analysis in Groundwater using Ultra Low-Level Liquid Scintillation Counter (극 저준위 액체섬광계수기를 이용한 지하수 중 라돈($^{222}Rn$) 측정법 연구)

  • Kim Yong-Je;Cho Soo-Young;Yoon Yoon-Yeol;Lee Kil-Yong
    • Journal of Soil and Groundwater Environment
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    • v.11 no.5
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    • pp.59-66
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    • 2006
  • Optimal method of radon analysis in groundwater was studied using ultra low-level liquid scintillation counter (ULLLSC) which is well known as an analytical instrument for analyzing the alpha and beta radionuclides in environmental materials. Optimization of pulse shape analyzer (PSA) in operating the LSC was performed with $^{241}Am\;and\;^{90}Sr/^{90}Y$ as well as $^{226}Ra$ Also, the chemical quenching of scintillation generation and the color quenching of the generated photon to photomultiplier tubes (PMT) were determined their effects not only to decrease the analytical efficiency but also to change the optimal PSA level and background due to high ion contents of groundwaters. The optimal PSA level was shown in the range of 90 to 110 with less than 5% error. The effects of high ion contents in groundwater for the analytical efficiency show within 10% error from the different ion contents. The chloroform as a quenching agent was used to determine the analytical efficiency with the different amount, showing that the efficiency decreases 20% using the 2% of chloroform.

A Study on the Analysis of 89Sr and 90Sr with Cerenkov Radiation and Liquid Scintillation Counting Method (첼렌코프광과 액체섬광계수법을 이용한 89Sr 및 90Sr 분석에 대한 연구)

  • Lee, Myung-Ho;Chung, Geun-Ho;Cho, Young-Hyun;Choi, Geun-Sik;Lee, Chang-Woo
    • Analytical Science and Technology
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    • v.15 no.1
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    • pp.20-25
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    • 2002
  • An accurate and simple analytical technique for $^{89}Sr$ and $^{90}Sr$, overcoming the demerits of the conventional method, has been developed with extraction chromatography and liquid scintillation counting. The Sr fraction was separated from hindrance elements with oxalate coprecipitation or cation exchange resin and purified with Sr-Spec column. With liquid scintillation counter, $^{89}Sr$ was measured by Cerenkov radiation method, and $^{90}Sr$ was measured by spectrum unfolding method. The developed radioactive strontium separation method was validated by application to the IAEA-reference material (IAEA-375, Soil) and radioactive waste samples.