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首页> 外文期刊>Radioactive Waste Management and Environmental Restoration >NORTH AMERICAN STUDIES ON LEAD MOBILITY IN SIMULATED NUCLEAR WASTE REPOSITORY ENVIRONMENTS
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NORTH AMERICAN STUDIES ON LEAD MOBILITY IN SIMULATED NUCLEAR WASTE REPOSITORY ENVIRONMENTS

机译：北美关于模拟核废料储存环境中铅迁移率的研究

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摘要

The potential mobility of lead, a candidate waste package material, under conditions simulating possible U.S. and Canadian nuclear waste disposal-vault environments, was investigated by conducting a series of corrosion and sorption experiments combined with geochemical calculations. The corrosion rates of lead in these environments never exceeded 40 μm/yr. The corrosion products were moderately soluble in the host geologies and groundwaters. Apparent diffusion coefficients for lead ranged from 10~(-15) to 10~(-11) m~2/s, and the distribution coefficients ranged from 95 to 378 mL/g. These results indicate both low mobility and high sorption behavior in these environments. Because these values for lead are in the same range as those of some radionuclides, the transport time for both lead and radionuclides are expected to be similar. Lead would be expected to react strongly with natural rock materials in the far field in both geologies. The low corrosion rate of lead and low rate of transport of corrosion products, together with lead's excellent gamma shielding properties that reduce groundwater radiolysis, are properties warranting consideration for enhanced disposal performance of waste packages in both the U.S. and Canada.
机译：通过进行一系列腐蚀和吸附实验并结合地球化学计算，研究了铅（一种可能的废物包装材料）在模拟美国和加拿大可能的核废物处置库环境的条件下的潜在迁移率。在这些环境中，铅的腐蚀速率从未超过40μm/ yr。腐蚀产物在宿主地质和地下水中溶解度中等。铅的表观扩散系数为10〜（-15）m〜2 / s，分布系数为95〜378 mL / g。这些结果表明在这些环境中低迁移率和高吸附行为。由于铅的这些值与某些放射性核素的值在同一范围内，因此铅和放射性核素的运输时间预计都相似。在这两种地质条件下，铅都将与天然岩石材料发生强烈反应。铅的低腐蚀速率和腐蚀产物的低传输速率，以及铅具有出色的伽玛屏蔽性能（可减少地下水的放射分解），这些特性在美国和加拿大都值得考虑，以提高废物包装的处置性能。

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