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Year : 2016  |  Volume : 39  |  Issue : 3  |  Page : 122-127

Determination of uranium concentrations and 234U/238U activity ratio in some granitic rock samples by alpha spectrometry: Application of a radiochemical procedure

Nuclear Materials Authority, El-Maadi, Cairo, Egypt; Department of Chemistry, Laboratory of Radiochemistry, University of Helsinki, FI 00014, Helsinki, Finland

Correspondence Address:
Mahmoud R Khattab
Nuclear Materials Authority, P.O. Box 530, El-Maadi, Cairo, Egypt; Department of Chemistry, Laboratory of Radiochemistry, University of Helsinki, P.O. Box 55, FI 00014, Helsinki, Finland

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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.194961

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The present study is an application of a radiochemical procedure using alpha spectrometry technique for determination of uranium isotopes 238 U,234 U, and 235 U on 13 granitic samples. These samples were collected from Gabal Gattar area, Northeastern Desert, Egypt. The collected samples were digested using microwave technique with aqua regia and spiked with 232 U for chemical yield and activity calculation. Separation of uranium isotopes from the samples was done by Dowex 1 × 4 (50–100 mesh) resin followed by source preparation using microprecipitation technique. The concentrations of 238 U were ranged between 28.9 ± 0.9 and 134.8 ± 1.8 Bq/g, and the 234 U concentrations were between 24 ± 0.6 and 147.7 ± 2.2 Bq/g. For the 235 U, the activity concentrations were between 1.3 ± 0.2 and 6.7 ± 1.2 Bq/g. The activity ratio of 234 U/238 U was calculated and varied from 0.80 to 1.30.

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