Natural radioactivity measurements and external dose estimation by car-borne survey in Douala city, Cameroon
Natural radioactivity measurements and external dose estimation by car-borne survey in Douala city, Cameroon
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喀麦隆杜阿拉市通过车载调查进行自然放射性测量和外部剂量估算
DOI:
10.1051/radiopro/2018032
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发表时间:
2018
期刊:
影响因子:
1.1
通讯作者:
Tokonami S.
中科院分区:
文献类型:
--
作者:
Takoukam Soh S.D.;Saidou;Hosoda M.;Ndjana Nkoulou II J.E.;Akata N.;Bouba O.;Tokonami S.
A car-borne survey was carried out in Douala, the largest city in Cameroon to make a detailed distribution map of the absorbed dose rate in the city, to locate the high natural radiation areas useful later to carry out indoor radon, thoron, and thoron progeny measurements. Gamma-ray dose rates were measured using 3-in  3-in NaI (Tl) detector. Activity concentrations of 238U, 232Th and 40K in soil from Douala city were determined by two methods: the first, using in situ gamma spectrometry and the second, at the laboratory using a NaI (Tl) detector. A heterogeneous distribution of absorbed dose rates in air was observed on the dose rate distribution map, and varies from 29 to 86 nGy hÀ1 with an average of 50 nGy hÀ1, lower than the world average value of 59 nGy hÀ1. The activity concentrations with NaI (Tl) detector varied from 18 to 47 Bq kgÀ1 for 238U, 21 to 54 Bq kgÀ1 for 232Th, and 10 to 410 Bq kgÀ1 for 40K with averages of 29, 38, and 202 Bq kgÀ1 respectively, for in situ measurements. They vary between 29–98 Bq kgÀ1 for 238U, 29–92 Bq kgÀ1 for 232Th, and 40 to 79 Bq kgÀ1 for 40K, with averages of 60, 57, and 56 Bq kgÀ1 respectively for soil samples collected at Douala III subdivision. The highest value of the annual effective dose for in situ measurements by car was observed at Ndogbong and was found to be 0.7 mSv yÀ1, higher than the world average value of 0.5 mSv yÀ1.
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影响因子:
2.8
作者:
Cebastien Joel Guembou Shouop;Maurice Ndontchueng Moyo;G. Chéné;Eric Jilbert Nguelem Mekontso;O. Motapon;Steve Kayo;D. Strivay
通讯作者:
D. Strivay
DOI:
--
发表时间:
2012
期刊:
--
影响因子:
--
作者:
S. Minato
通讯作者:
S. Minato
DOI:
10.1016/j.jrras.2014.06.001
发表时间:
2014-07-01
影响因子:
1.7
作者:
Ademola, Augustine Kolapo;Bello, Adekunle Kazeem;Adejumobi, Adeniyi Caleb
通讯作者:
Adejumobi, Adeniyi Caleb
DOI:
10.5453/jhps.15.19
发表时间:
1980
期刊:
影响因子:
--
作者:
S. Minato
通讯作者:
S. Minato
影响因子:
--
作者:
M. Hosoda;Kazumasa Inoue;M. Oka;Y. Omori;K. Iwaoka;S. Tokonami
通讯作者:
S. Tokonami