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Natural and artificial gamma-emitting radionuclides in volcanic soils of the Western Canary Islands
Journal of Geochemical Exploration ( IF 3.9 ) Pub Date : 2021-06-16 , DOI: 10.1016/j.gexplo.2021.106840
María López-Pérez , Candelaria Martín-Luis , Francisco Hernández , Esperanza Liger , José Carlos Fernández-Aldecoa , José Miguel Lorenzo-Salazar , José Hernández-Armas , Pedro A. Salazar-Carballo

Terrestrial gamma absorbed dose rates as well as spatial distribution of gamma-emitting radionuclides 40K, 226Ra and 232Th and 137Cs in soils, are provided in detail for the first time in the Western Canary Islands.

The distribution of terrestrial gamma absorbed dose rates and the activity concentrations of 40K, 226Ra and 232Th are discussed with respect to the main lithologies and geological features of each island. The average terrestrial absorbed dose rate (71.4 nGy·h−1) reported here was slightly higher to previously reported values for the Eastern islands of this archipelago (43 nGy·h−1) and close to the world's average (59 nGy·h−1).

Relatively high 137Cs activity concentrations, up to 100 Bq·kg−1, were measured in some of the collected samples. To understand the origin of these activities, we compared the results from two different field surveys performed in 1991 and in 2013. The activity concentrations were found to be rather similar despite the 22 years gap between the measurements. Complementary radiometric data from aerosol samples collected at this site show that there are additional contributions of 137Cs to this site produced by the deposition of dust particles brought by Saharan dust storms.

In terms of radiological risk, the gamma absorbed doses reported (external exposure) pose no risk to the local population. However, the contribution of the soil 137Cs activity concentrations to the gamma absorbed dose were as high as 50% in some few locations.



中文翻译:

西加那利群岛火山土壤中天然和人工发射伽马射线的放射性核素

在西加那利群岛首次详细提供了地面伽马吸收剂量率以及土壤中伽马发射放射性核素40 K、226 Ra 和232 Th 和137 Cs 的空间分布。

结合每个岛屿的主要岩性和地质特征,讨论了陆地伽马吸收剂量率的分布和40 K、226 Ra 和232 Th的活动浓度。平均地面吸收剂量率(71.4 NGY·H -1)报道这里是略高于先前报道的值,这个群岛的东部岛屿(43 NGY·H -1),并接近世界平均水平(59 NGY·H - 1)。

在一些收集的样品中测量到相对较高的137 Cs 活性浓度,高达 100 Bq·kg -1。为了了解这些活动的起源,我们比较了 1991 年和 2013 年进行的两次不同实地调查的结果。尽管两次测量之间存在 22 年的差距,但发现活动浓度相当相似。该站点收集的气溶胶样本的补充辐射测量数据表明,撒哈拉沙尘暴带来的沙尘颗粒沉积对该站点产生了137 Cs 的额外贡献。

在放射学风险方面,报告的伽马吸收剂量(外照射)不会对当地人口构成风险。然而,土壤137 Cs 活性浓度对 γ 吸收剂量的贡献在一些地方高达 50%。

更新日期:2021-06-18
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