Abstract
Neutron activation analysis using 75Ge (half life 82.8 min, 265 keV) was applied for the determination of microgram quantities of germanium. The each sample was irradiated for 10 min in irradiation cave in a thermal neutron flux (0.8×1012 n cm-2 s-1). After 2 h-cooling, gamma-rays were counted for 500 s with a Ge (Li) detector, (resolution, 1.9keV at 1332 keV), which was connected with a pulse hight analyzer. The detection limit was 1μg of germanium. This method was compared with the colorimetric method using phenylfluorone as a reagent. Germanium in some samples, which are of forensic interest, could be determined nondestructively by the present method, when it contained more than 10-100μg/g. For example, in the case of germanium containing drinking water, germanium content was found to be 550μg/ml.
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