The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Secondary Ion Man Spectrometry: Theory rind Applications in Geosciences

이차이온질량분석기의 원리와 지질학적 응용

  • 최변각 (서울대학교 지구과학교육과)
  • Published : 2001.12.01
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Abstract

Secondary ion mass spectrometry (SIMS) uses focused high-speed primary ions to produce secondary ions from sample surface that are analyzed through a mass filter. SIMS is often called as ion microprobe, since it offers a micrometer-scale spatial resolution. Although the precision and accuracy of SIMS are not as good as many conventional mass spectrometers, it has several advantages such as small sample-size requirement, high spatial resolution and capability of in-situ analysis. In the field of geochemistry/cosmochemistry, SIMS is widely used for (1) stable isotope geochemistry of H, C, O, S, etc., (2) geochronology of U/Th-bearing minerals, (3) lateral distribution of trace elements in a mineral, and (4) discovery of presolar grains and investigation of their isotopic compositions.

이차이온질량분석기는 고속으로 가속된 일차이온을 고체 시료 표면에 충돌시켜, 이차이온을 발생시킨 후 질량분석 장치를 통해 분석하는 장치이다. 시료에 충돌하는 일차이온빔의 크기를 마이크론 단위까지 줄여 미세영역에 대한 분석이 가능하므로 이온현미분석기라고도 불린다. 이차이온질량분석기의 정밀도와 정확도는 고전적인 질량분석기에 비해 떨어진다. 하지만, 극소량의 시료로 분석이 가능하며, 화학적 전처리 과정 없이 연마편을 이용하여 매우 좁은 영역에서 동위원소의 분포를 연구할 수 있다는 장점이 있다. 지구화학/우주화학 분야에서 이차이온질량분석기의 활용은 최근 급속히 증가하고 있으며, 주로 (1) 수소, 탄소, 산소, 황 등의 안정동위원소 연구, (2) 함 우라늄/토륨 광물의 절대연령측정, (3) 광물 내 미량원소의 분포 연구, (4) 선태양계 광물 발견 및 이들의 동위원소 연구 등에 사용되고 있다.

Keywords

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