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首页> 外文期刊>Environmental Science & Technology >High Naturally Occurring Radioactivity In Fossil Groundwater From The Middle East
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High Naturally Occurring Radioactivity In Fossil Groundwater From The Middle East

机译：中东化石地下水中自然发生的高放射性

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摘要

High levels of naturally occurring and carcinogenic radium isotopes have been measured in low-saline and oxic groundwater from the Rum Group of the Disi sandstone aquifer in Jordan. The combined ~(228)Ra and ~(228)Ra activities are up to 2000% higher than international drinking water standards. Analyses of the host sandstone aquifer rocks show ~(228)Ra and ~(228)Ra activities and ratios that are consistent with previous reports of sandstone rocks from different parts of the world. A compilation of previous data in groundwater from worldwide sandstone aquifers shows large variations in Ra activities regardless of the groundwater salinity. On the basis of the distribution of the four Ra isotopes and the ratios of the short- to long-lived Ra isotopes, we postulate that Ra activity in groundwater is controlled by the balance of radioactive decay of parent Th isotopes on aquifer solids, decay of the dissolved radium isotopes, and adsorption of dissolved Ra on solid surfaces. The availability of surface adsorption sites, which depends on the clay content in the aquifer rocks, is therefore an important constraint for Ra activity in sandstone aquifers. These findings raise concerns about the safety of this and similar nonrenewable groundwater reservoirs, exacerbating the already severe water crisis in the Middle East.
机译：在约旦迪斯砂岩含水层朗姆酒集团的低盐和含氧地下水中测得高含量的天然和致癌性镭同位素。 〜（228）Ra和〜（228）Ra的综合活性比国际饮用水标准高出2000％。对宿主砂岩含水层岩石的分析表明，〜（228）Ra和〜（228）Ra的活度和比值与之前来自世界各地的砂岩岩石的报道一致。来自世界各地砂岩含水层的地下水的先前数据的汇编显示，与地下水盐度无关，Ra的活动差异很大。根据四种Ra同位素的分布以及短寿命和长寿命Ra同位素的比率，我们假设地下水中的Ra活性受母体Th同位素对含水层固体的放射性衰变，水合物衰变的平衡的控制。溶解的镭同位素，以及溶解的Ra在固体表面的吸附。因此，依赖于含水层岩石中粘土含量的表面吸附位点的可用性是砂岩含水层中Ra活性的重要限制。这些发现引起了人们对这种和类似的不可再生地下水库的安全性的担忧，加剧了中东已经严重的水危机。

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