保健物理
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
自然環境のウラン分析
溝畑 朗松並 忠男真室 哲雄
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ジャーナル フリー

1977 年 12 巻 3 号 p. 175-179

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Nondestructive uranium analysis by epithermal neutron activation was confirmed to be utilized as a simple and reliable method for the determination of uranium in environmental materials such as surface soil and river sediment. In the case of surface soil, samples to be irradiated with neutrons are prepared in the following manner so that they may be satisfactorily represent the actual mean chemical compositions. From 2 to 3kg of surface soil having been passed through a sieve to remove particles larger than 1mm in diameter, about 5g are taken and pulverized in a mixer-mill. About 100mg of the pulverized soil are accurately weighed and sealed into a polyethylene bag. The samples thus prepared are wrapped in a cadmium foil and irradiated with reactor neutrons. Gamma-ray spectra of activated samples are collected 4 to 5 days after the neutron irradiation. The detection limit was found to be about 0.1ppm for usual soil samples.

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