Abstract
The activities of primordial radionuclides in surface soil at Ibadan, South-Western Nigeria have been measured with a 7.6cm x 7.6cm NaI(TL) detector. The mean absorbed dose rate, annual effective dose and the collective effective dose at Ibadan were evaluated from measurement of 40K; 238U; 232Th activities and their mean values found to be 0.070 ± 0.008 mGy.h-1, 86.1 mSv.y-1 and 344.2 man Sv.y-1, respectively. Keywords: soil; dose; effective; collective; 40K; 238U; 232Th; exposure [Global Jnl Pure & Appl. Sci. Vol.9(3) 2003: 393-396]
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