Dose assessment due to terrestrial gamma radiation in Ibadan, South Western Nigeria

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]