在过去的三十年中,加拿大本地和进口瓶装水的消费量大大增加。虽然在处理这些瓶装产品的水质时,天然放射性的存在往往被忽视,它可以大大有助于放射性核素的吸收,特别是当来自与消耗它的地方相比具有较高放射性水平的地区时。在这项研究中,几种天然存在的放射性核素的活性(即,210Po,226,228Ra,230,232Th,234,235,238U)是在魁北克可用的瓶装水中测量的,加拿大经过样品预处理和通过辐射或质谱方法进行分析。在所有测试的样品中,230、232Th和228Ra浓度低于最低可检测活性水平。234U的分析结果,235U,238U,226Ra的浓度范围为0.38至115mBq/L,(2.2-313)x10-2mBq/L,0.48-58.4mBq/L,和1.1-550mBq/L,分别。仅在5个样品中检测到210Po,其活性范围为2至26mBq/L。为了确定品牌内活动的可变性,连续两年购买了相同品牌的瓶装水并进行了分析。根据不同的饮酒习惯情景评估了消耗这些类型的水的可能的放射性影响。一些进口水品牌显示出比本地来源或自来水更高的活性浓度,这表明,主要饮用进口瓶装水的人将比主要饮用当地水的人接受更高的辐射剂量。
Consumption of local and imported bottled water in Canada has greatly increased during the past three decades. While the presence of natural radioactivity is often overlooked when dealing with the water quality of these bottled products, it could contribute substantially to the uptake of radionuclides especially when sourced from regions with higher radioactivity levels compared to where it is consumed. In this study, the activity of several naturally occurring radionuclides (i.e., 210Po, 226,228Ra, 230,232Th, 234,235,238U) were measured in bottled water available in Québec, Canada after sample pretreatment and analysis by either radiometric or mass spectrometry approaches. 230,232Th and 228Ra concentrations were below minimum detectable activity levels in all samples tested. Analytical results for 234U, 235U, 238U, and 226Ra showed concentrations that ranged from 0.38 to 115 mBq/L, (2.2-313) x 10-2 mBq/L, 0.48-58.4 mBq/L, and 1.1-550 mBq/L, respectively. 210Po was detected in only 5 samples and its activity ranged from 2 to 26 mBq/L. To determine variability in activity within brands, the same brands of bottled water were purchased during two consecutive years and analyzed. The possible radiological impact of the consumption of these types of water was assessed based on different drinking habit scenarios. Some of the imported water brands showed higher activity concentrations than local sources or tap water, suggesting that individuals drinking predominantly imported bottled water would receive a higher radiation dose than those who drink mainly local water.