Determination of traces of phosphorus in gallium arsenide by radiochemical neutron activation analysis |
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Authors: | G. Küppers G. Erdtmann |
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Affiliation: | (1) Central Division of Chemical Analysis (ZCH), Research Center Jülich Gmbh (KFA), P.O. Box 1913, D-5170 Jülich, (Germany) |
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Abstract: | A radiochemical separation procedure has been developed to determine traces of phosphorus in gallium arsenide. In this procedure the indicator nuclide32P is separated from all other long-lived activation products in high purity. The resulting eluate is sufficiently pure to allow -counting. Because of the high -energy of32P (1710 keV) the activity can be measured via the Cerenkov effect, whereas most radionuclides, because they have essentially lower -energies, are discriminated by this technique, so that the selectivity of the measurement of32P is improved considerably. A detection limit of 1 ng/g was achieved when using samples of 50 mg, a thermal neutron flux of th=1·1013n·cm–2·s–1, an irradiation time of 36 hours and a measuring time of 1 hour. |
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