Determination of low levels of uranium impurity by fission track registration using mica and polycarbonate detectors

Shin, Seong-Cheon; Park, Keung-Shik

doi:10.1016/1359-0189(89)90026-5

Cited by 10 publications

(2 citation statements)

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“…(Nakanishi, 1987), 광전 소자(photoelectric element)에서는 전도율의 저하요인 이 될 수도 있다 (Dhawan, 1986). 광전 소자로 쓰이 는 황화카드뮴(CdS) 성분의 국산 반도체 분말시료를 피션트랙법으로 검증한 결과에서는 미량(~1.4 ppm)의 우라늄 불순물만 검출되었을 뿐 트랙 불균질 현상은 전혀 관찰되지 않았다 (Shin and Park, 1989). 액체시료 경우에는, 우라늄 함량이 10 0 ppb 수준 이하인 일반 하천수, 지하수, 수돗물 등에서는 우라늄 불균질 현상은 전혀 문제가 되지 않는다.…”

Section: 결과 및 토의 암석과 석탄의 우라늄 함량unclassified

“…피션트랙에 의한 우라늄 정량기법이 국내에 처음 소개된 것은 함-우라늄광물인 저콘에 대한 외부디텍터 법(external detector method)의 적용이다 (Shin, 1987). 또한 비지질물질인 반도체 소재와 구강용 치약에 들 어있는 미량(<1.5 ppm)의 우라늄 불순물의 정량에 관 해 보고된 바 있다 (Shin and Park, 1989). 이후 피 션트랙법은 연대측정 목적에만 전적으로 이용되었고, 우라늄 정량에만 별도로 적용된 사례는 없다.…”

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Determination of Uranium Concentration in Solid- and Liquid-state Geological Materials by Fission Track Registration Technique and its Applicability

Shin¹

2015

The Journal of the Petrological Society of Korea

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The fission track registration techniques for accurate determinations of uranium in solid-and liquid-state geological materials were recommended and their applicability were examined. The determination of uranium can be achieved by optical counting of neutron-induced fission tracks of 235 U registered on solid-state track detectors under high magnification. In a dry registration method using powdered pellets of rocks (e.g., granite and coal) showing good uranium-affinity, it was not easy to decide an overall mean concentration over the total sample owing to track-clusters caused by frequent presence of uranium-bearing minerals. Separate scanning for homogeneous and track-clustered parts may be an alternative choice. Assuring the homogeneity over the whole sample, high reproducibilities were confirmed both from duplicate detections using mica and Lexan polycarbonate detectors and from multiple measurements at different thermal neutron fluences. The wet registration method using sealed quartz tubes is recommended to overcome the common heterogeneity in uranium concentrations of 10 1 ppm and more. Adopting the wet registration, the uranium homogeneity was recovered below the 10 0 ppm level and the lower detection limit was proved to reach without difficulty the 10 -2 ppb (i.e. ng g -1 ) level.

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Section: 결과 및 토의 암석과 석탄의 우라늄 함량unclassified

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