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首页> 外文会议>STI/PUB/1228; International Workshop on Environmental Contamination from Uranium Production Facilities and their Remediation; 20040211-13; Lisbon(PT) >ENVIRONMENTAL HAZARDS AT THE FORMER URANIUM MINES URGEIRICA, CUNHA BAIXA AND QUINTA DO BISPO
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ENVIRONMENTAL HAZARDS AT THE FORMER URANIUM MINES URGEIRICA, CUNHA BAIXA AND QUINTA DO BISPO

机译：前铀矿URGEIRICA，CUNHA BAIXA和QUINTA DO BISPO的环境危害

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摘要

The exploitation of radium salts and uranium in Portugal over almost a century produced a large amount of waste that may be the source of environmental impacts in the surrounding areas. The mines of Urgeirica, Cunha Baixa and Quinta do Bispo were the most important, with a total of 7.2 million t of mining mill tailings and wastes produced and currently deposited in several places near the old mining sites. A total of 325 samples from the tailings, waste waters, surface and groundwaters, stream sediments and soils were collected and analysed for total U and for the radionuclides of its decay chain. The comparative study revealed differences between the Urgeirica, Cunha Baixa and Quinta do Bispo mining areas concerning the distribution pattern of the radionuclides. The most relevant difference is the high concentration of ~(226)Ra measured in waters and soils around the Cunha Baixa site, the result of geological and anthropogenic factors. The radionuclide activities in the stream sediments of the main watercourse that drains the Urgeirisa mine site are also high, particularly in the cases of ~(238)U and ~(230)Th, probably originating from the mill tailings deposit.
机译：在近一个世纪的时间里，葡萄牙对镭盐和铀的开采产生了大量废物，可能是对周边地区造成环境影响的来源。 Urgeirica，Cunha Baixa和Quinta do Bispo矿是最重要的矿山，总共生产了720万吨矿山尾矿和废物，目前这些矿山堆积在老矿区附近。收集了来自尾矿，废水，地表水和地下水，溪流沉积物和土壤的325个样品，并分析了总U及其衰变链的放射性核素。对比研究显示，Urgeirica，Cunha Baixa和Quinta do Bispo矿区之间在放射性核素的分布方式方面存在差异。最相关的差异是在Cunha Baixa站点周围的水和土壤中测得的〜（226）Ra的高浓度，这是地质和人为因素的结果。排入Urgeirisa矿区的主要河道中的河流沉积物中放射性核素的活动也很高，特别是在〜（238）U和〜（230）Th的情况下，这些放射性核素的活动可能源自磨矿尾矿床。

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