Ruđer Bošković Institute, Bijenička cesta 54, 10 000, Zagreb, Croatia.
Environ Sci Pollut Res Int. 2022 Aug;29(36):54632-54640. doi: 10.1007/s11356-022-19741-7. Epub 2022 Mar 19.
Radiological risks associated with K, Ra and Th massic activities in limestones, marls, stream sediments and soils of the Kaštela Bay (Croatia) coastal area were assessed by calculating outdoor absorbed dose rates in air (D), annual outdoor effective dose rates (D), radium equivalent activities (Ra) and external hazard indices (H). Radionuclides relative contributions to D and H were determined for all four types of samples as well as their total contribution to H in all samples. D, D, Ra and H were the lowest in limestones and the highest in soils. Maximum Ra and H in soil were below the recommended values of 370 Bq/kg and 1.0. No adverse radiological effects were determined in the researched area. The most important contribution to D and H in limestones was almost exclusively from Ra, in marls from K, in stream sediments from Ra and in soils from Th. The most significant total contribution to H in all samples came from Ra and Th, and the lowest came from K. Ra showed the largest variability of its total contribution to H, with tendency to higher values. Special attention should be given to Ra when studying radiological risks in typical karstic areas, irrespectively of other possible influences of geological background.
通过计算石灰岩、泥灰岩、溪流沉积物和土壤中的 K、Ra 和 Th 质量活度在户外空气中的吸收剂量率（D）、年户外有效剂量率（D）、镭当量活度（Ra）和外部辐射危害指数（H），评估了卡斯塔拉湾（克罗地亚）沿海地区的放射性风险。还确定了所有四种类型样本中 D 和 H 的放射性核素相对贡献，以及所有样本中 H 的总贡献。D、D、Ra 和 H 在石灰岩中最低，在土壤中最高。土壤中最大的 Ra 和 H 值低于 370 Bq/kg 和 1.0 的建议值。在研究区域未发现不利的辐射影响。D 和 H 在石灰岩中几乎完全来自 Ra，在泥灰岩中来自 K，在溪流沉积物中来自 Ra，在土壤中来自 Th。所有样本中对 H 的总贡献最大的是 Ra 和 Th，最小的是 K。Ra 对 H 的总贡献变化最大，有偏高的趋势。在研究典型喀斯特地区的放射性风险时，无论地质背景可能存在其他影响如何，都应特别注意 Ra。
