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.
Tokonami S.
中科院分区:
医学4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.

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在喀麦隆最大的城市杜阿拉进行了一次车载测量,以绘制城市吸收剂量率的详细分布图,确定高天然辐射区,以便以后进行室内氡、钍射气和钍射气子体测量。使用3英寸3英寸NaI(Tl)探测器测量伽马射线剂量率。本文采用现场γ能谱法和实验室NaI(Tl)探测器法测定了杜阿拉市土壤中~(238)U、~(232)Th和~(40)K的活度浓度。在剂量率分布图上观察到空气中吸收剂量率的不均匀分布,从29到86 nGy hm 3/h变化,平均值为50 nGy hm 3/h,低于世界平均值59 nGy hm 3/h。用NaI(Tl)探测器测量的放射性浓度范围为238 U 18 ~ 47 Bq·kg-1、232 Th 21 ~ 54 Bq·kg-1和40 K 10 ~ 410 Bq·kg-1,平均值分别为29、38和202 Bq·kg-1。在杜阿拉III分区采集的土壤样品中,238 U的放射性活度在29-98 Bq kg·1之间变化,232 Th的放射性活度在29-92 Bq kg·1之间变化,40 K的放射性活度在40 - 79 Bq kg·1之间变化,平均值分别为60、57和56 Bq kg·1。在Ndogbong观测到了汽车现场测量的年有效剂量最高值,为0.7 mSv young/1,高于世界平均值0.5 mSv young/1。
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.
使用伽马能谱法评估喀麦隆杜阿拉沿海地区使用的砂建筑材料的天然放射性和相关辐射危害
DOI: --
发表时间: 2017
影响因子: 2.8
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