Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2007.1534.1537ArogunjoA.M. 112007711Gamma radiation level due to primeval radionuclides in surface soil in some South-Western cities in Nigeria has been carried out using a 7.6x7.6 cm NaI (Tl) detector. The mean absorbed dose rate and annual effective dose were evaluated from the measurement of 40K; 238U; 232Th. The absorbed dose rates values ranged from 18.6 to 68.4 with a mean (±SD) value of 44.2±15.9 nGy h-1 in Lagos area; 26.8 to 145.6 with a mean value of 72.9±35.6 nGy h-1 in Ibadan area and 30.9 to 98.9 with a mean value of 64.2±26.5 nGy h-1 in Akure area. The mean effective dose for these locations is 56.5, 93.3 and 82.2 μSv year-1, respectively. The mean value for the region is 0.8 mSv year-1, which is less than the 1 mSv year-1 recommended for normal environment by UNSCEAR.]]>Abbady, A.G.E.,200460111114Ademola, J.A. and I.P. Farai,2006121395398Alberto, M., R. Milena, G. Annibale,19959453459Ajayi, I.R., M.O. Oresegun and I.A. Babalola,19968c3840Ajayi, I.R. and O.O. Kuforiji,2001331316Arogunjo, A.M. and I.P. Farai,20039393398Arogunjo, A.M., H.O. Ohenhen and S.P. Olowokere,2004112259265Arogunjo, A.M., I.P. Farai and I.A. Fuwape,20041087377Beck, H.L., J.A. De Campo and C.V. Gogolak,1972In situ ge (li) and nal (tl) gamma-ray spectrometry.]]>1972Farai, I.P. and N.N. Jibiri,200088247254Farai, I.P. and J.A. Ademola,2001956973Ibrahiem, N.M., A.H. Abd El Ghani, S.M. Shawky, E.M. Ashraf and M.A. Farouk,199364620627Jibiri, N.N. and I.P. Farai,199876191194United Nations Scientific Committee on the Effects of Atomic Radiations,19881988Wollenberg, H.A. and R.A. Smith,199058183189