Natural radioactivity and external dose in the high background radiation area of Lambwe East,Southwestern Kenya

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...

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Bibliographic Details
Published in:	Radiation protection dosimetry Vol. 152; no. 4; pp. 423 - 428
Main Authors:	Achola, S O, Patel, J P, Mustapha, A O, Angeyo, H K
Format:	Journal Article
Language:	English
Published:	England 01-12-2012
Subjects:	Background Radiation Environmental Exposure - analysis Kenya Radiation Monitoring - methods Radioisotopes - analysis Kenya
Online Access:	Get full text
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Summary:	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 (232)Th, (226)Ra and (40)K 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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0144-8420 1742-3406
DOI:	10.1093/rpd/ncs047