M Abdelmonem, MA Abd El-Samad, HA Hanafi and AMH Ibrahim
The present study aims to use the α-spectrometry using silicon surface-barrier detector Si (Li), as a radiometric technique to estimate U-isotopes and Ra-226 that were carried out for two rock samples from Gabal Gattar, north-eastern desert area, Egypt and two references soil samples of international atomic energy agency, IAEA. A secular equilibrium between U-238 and U-234 and disequilibrium between U-238 and Ra-226 were observed. There is no significant change of radioactivity levels of U-238, U-234 and Ra-226; this means that there is secular equilibrium between U-238 and its relative daughters. Specific dose equivalent rate of sample #1 equal about three times the corresponding value of sample #2 and doses equivalent rate for both two samples are negligible after about 6 cm without shield.
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