de Oliveira J, Mazzilli B, Sampa M H, Silva B
Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear-SP, Brazil.
Appl Radiat Isot. 1998 Apr;49(4):423-7. doi: 10.1016/s0969-8043(97)00285-6.
In this paper the activity concentrations of 226Ra and 222Rn were assayed in the mineral spring waters of Aguas da Prata in order to evaluate the seasonal variations of such radionuclides. The results obtained were related to the chemical composition of the water as well as to the lithology of the aquifer and temperature. Higher activity concentrations up to 1.8 x 10(3) mBq L-1 for 226Ra and 1.2 x 10(2) Bq L-1 for 222Rn have been observed in waters with low levels of soluble salts. Waters which present high levels of carbonate and sulphate salts showed maximum values of 2.5 x 10(2) mBq L-1 for 226Ra and 2.7 x 10(1) Bq L-1 for 222Rn. This behaviour is mainly due to the physico-chemical properties of these radionuclides in water as well as to the lithologic structure of the aquifers.
为评估镭 - 226和氡 - 222的季节性变化，本文对阿瓜斯·达普拉塔矿泉水中这两种放射性核素的活度浓度进行了测定。所得结果与水的化学成分、含水层岩性及温度相关。在可溶性盐含量较低的水中，观测到镭 - 226的活度浓度高达1.8×10³ 毫贝克勒尔/升，氡 - 222的活度浓度高达1.2×10² 贝克勒尔/升。碳酸盐和硫酸盐含量高的水中，镭 - 226的最大值为2.5×10² 毫贝克勒尔/升，氡 - 222的最大值为2.7×10¹ 贝克勒尔/升。这种现象主要归因于这些放射性核素在水中的物理化学性质以及含水层的岩性结构。
