Chege M W, Hashim N O, Merenga A S, Meisenberg O, Tschiersch J
Physics Department, Kenyatta University-Mombasa Campus, PO Box 16778, Mombasa, Kenya
Physics Department, Kenyatta University, PO Box 43844, Nairobi, Kenya.
Radiat Prot Dosimetry. 2015 Nov;167(1-3):139-42. doi: 10.1093/rpd/ncv231. Epub 2015 Apr 27.
This study presents radon and thoron concentration measurements and the corresponding effective dose rates in mud dwellings located in the high background radiation area of Mrima Hill, Kenya. Discriminative technique was used for simultaneous measurement of radon and thoron. The effective dose was evaluated based on the concentration of the isotopes and the time spent indoors. Radon concentration ranged from 16 to 56 Bq m(-3) with an average of 35±14 Bq m(-3) and a corresponding annual effective dose of 0.67 mSv y(-1), while that of thoron ranged from 132 to 1295 Bq m(-3) with an average of 652±397 Bq m(-3) and an effective dose of 13.7 mSv y(-1).
本研究展示了肯尼亚姆里马山高本底辐射地区泥屋中氡和钍射气的浓度测量结果以及相应的有效剂量率。采用鉴别技术同时测量氡和钍射气。根据同位素浓度和在室内停留的时间评估有效剂量。氡浓度范围为16至56 Bq m(-3)，平均为35±14 Bq m(-3)，相应的年有效剂量为0.67 mSv y(-1)，而钍射气浓度范围为132至1295 Bq m(-3)，平均为652±397 Bq m(-3)，有效剂量为13.7 mSv y(-1)。
