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Radiation Protection Dosimetry Advance Access originally published online on October 19, 2007
Radiation Protection Dosimetry 2008 129(4):473-477; doi:10.1093/rpd/ncm448
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Assessment of absorbed dose rate in air over plowed arable lands in Sinnar State, central Sudan

A. K. Sam* and Moawia M. Elmahadi

Sudan Atomic Energy Commission, PO Box 3001, Khartoum, Sudan

* Corresponding author: adam_sam{at}hotmail.com

Received July 11, 2007, amended September 3, 2007, accepted September 8, 2007

The absorbed gamma-dose rate in air at a height of 1 m above ground level was calculated from activity concentrations of gamma-emitting radionuclides in arable soil samples collected from eight locations within Sinnar State using the published Dose Rate Conversion Factors. Measurements were carried out using high-resolution gamma-spectrometry. On average, the activity concentrations obtained were 38 ± 8 (232Th), 17 ± 2 (226Ra), 174 ± 19 (40K) and 0.9 ± 0.2 Bq kg–1 for the fallout radionuclide 137Cs. The average value obtained here for 232Th is slightly higher than the corresponding world-average. The calculated absorbed dose rate in air at a height of 1 m for all sampled locations ranges from 31 to 47 nGy h–1 with an average value of 39 ± 7 nGy h–1 which is characteristic of normal background radiation areas. The corresponding annual effective dose was 47.8 ± 6 µSv y–1. The major contribution to the total absorbed dose rate comes from 232Th, which amounts to 61%. Recalculation of the absorbed dose rate-based gamma-energies of individual nuclides from uranium and thorium decay series and 40K showed that the greater part of the absorbed dose from the uranium series is due to 214Bi, whereas for the 232Th series it is equally attributed to 228Ac and 208Tl.


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