Natural radioactivity and external dose in the high background radiation area of Lambwe East, Southwestern Kenya
Date
2012Author
Achola SO.
Pate JP.
Mustapha AO.
Angeyo HK.
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
Absorbed dose rates around the North and South Ruri hills in Lambwe east, southwestern Kenya were measured using survey meters. The area lies roughly between latitudes 0°30′S and 1°00′S. It is bounded on the east by longitude 34°30′E and on the west by the shores of Lake Victoria and Winnam Gulf. The measured absorbed dose varies from 0.7 to 6.0 µGy h−1, and the mean is 2.3 µGy h−1. Assuming an outdoor occupancy factor of 0.4, the corresponding range and mean annual effective doses are 1.7–14.7 and 5.7 mSv, respectively. The average activity concentrations (ACs) of 232Th, 226Ra and 40K in samples of soils and rocks from the area are 1397, 179 and 509 Bq kg−1, respectively. Values of absorbed dose rates calculated from the ACs are general lower than those obtained from in situ measurements. Possible causes of these discrepancies were discussed in the paper.
URI
http://rpd.oxfordjournals.org/content/152/4/423.short#aff-1http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/35132
http://www.ncbi.nlm.nih.gov/pubmed/22535833
Citation
Radiat Prot Dosimetry (2012) 152 (4): 423-428. doi: 10.1093/rpd/ncs047Publisher
College of Biological and Physical Sciences, University of Nairobi