Journal
RADIATION PROTECTION DOSIMETRY
Volume 98, Issue 4, Pages 441-444Publisher
NUCLEAR TECHNOLOGY PUBL
DOI: 10.1093/oxfordjournals.rpd.a006736
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The average outdoor absorbed dose rate in air and the average annual effective dose equivalent due to terrestrial gamma radiation from K-40, U-238 and Th-232 in rocks in Ondo and Ekiti States. Southwestern Nigeria have been evaluated from measurements of the concentrations of these radionuclides in this environmental material. The concentration measurements were obtained using a very sensitive gamma spectroscopic system consisting of a 7.6 cm X 7.6 cm NaI(Tl) scintillation detector coupled to a computerised ACCUSPEC installation. The average absorbed dose rate and average annual effective dose equivalent was found to be 8.33 +/- 2.76 nGy.h(-1) and 8.7 +/- 2.9 muSv.y(-1) respectively.
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