保健物理
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
液体シンチレーション測定における異状試料の2重比法による自動検出
越島 得三郎
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ジャーナル フリー

1986 年 21 巻 2 号 p. 75-79

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In liquid scintillation measurement, counting rate is affected not only by the quenching but also by other causes such as nonhomogeneity of specimen and chemiluminescence. In this work, a method is presented to detect the affected samples automatically by using the double ratio technique of which standard curve is approximated with a polynomial of the external standard ratio. The deviation was calculated as the minimum distance from the standard curve to a plot of measured sample, which shows a discrepancy of a sample in the pulse height spectrum of beta-decay nuclides. When the discriminating level was set at 0.02 in the deviation, adsorption of specimen or chemiluminescence could be detected practically. Reliability of the presented method and setting of discriminating level were discussed.

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