Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
권호 표지

Determination of trace actinide (Am, Pu, Th, U) using alpha spectrometry and neutron activation analysis

알파분광법과 중성자방사화분석법에 의한 극미량의 악티늄계원소 (Am, Pu, Th, U)분석연구

  • Yoon, Yoon Yeol (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee, Kil Yong (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Cho, Soo Young (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Kim, Yongjai (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee, Myong Ho (Nuclear Environment Research Division, Korea Atomic Energy Research Institute)
  • 윤윤열 (한국지질자원연구원, 지하수지열연구부) ;
  • 조수영 (한국지질자원연구원, 지하수지열연구부) ;
  • 이길용 (한국지질자원연구원, 지하수지열연구부) ;
  • 김용제 (한국지질자원연구원, 지하수지열연구부) ;
  • 이명호 (한국원자력연구소 원자력환경연구부)
  • Received : 2004.05.31
  • Accepted : 2004.07.16
  • Published : 2004.08.25
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Abstract

Determination of actinides in the environmental sample requires separation of each element. This procedure is tedious and time consuming. And also, the detection limits of some nuclides using alpha spectrometry are rather higher. To overcome the lower detection limit and complicated separation procedure, a simple analytical technique for the determination of actinide isotopes in the environmental samples was developed and applied to IAEA and NIST reference sediment samples. For the separation of actinides from matrix, anion exchange resin and TRU-spec extraction chromatography resin were used and chemical yields were obtained using natural uranium, thorium, $^{242}Pu$ and $^{243}Am$ tracers. For overcoming the higher detection limits of U and Th in alpha spectrometry, neutron activation analysis was applied. Using combined method, the detection limit was increased about 10 times. The activity values of each isotope were consistent with the reference values reported by IAEA and NIST.

환경시료중의 극미량의 악티늄계 동위원소들을 분석하기는 무척 어렵다. 이들 원소들은 개별 분리하는 작업이 필요하며, 알파분광법으로 분석한 어떤 핵종들은 검출감도도 높은 편이다. 이런 극미량의 악티늄계 동위원소들을 분석하기 위해 용매추출법이 결합된 TRU-Spec 이온교환수지와 음이온 교환수지를 사용하여 악티늄계 원소들을 분리한 후 알파분광법으로 검출하였다. 그리고 U과 Th의 검출한계를 낮추기 위해 중성자방사화분석법을 적용하였다. 중성자방사화분석법을 적용하기 위한 바탕물질로 고순도 V foil을 사용하여 검출감도를 10배 향상시킬 수 있었으며, 이 분석법을 표준시료인 NIST-4354, IAEA-368 퇴적물 시료에 적용한 결과 표준값과 10% 이내에서 잘 일치하였다.

Keywords

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