Mapping short-lived radium isotopes in estuarine residential canals (Gold Coast, Australia)
Mapping short-lived radium isotopes in estuarine residential canals (Gold Coast, Australia)
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DOI：
10.1007/s10967-017-5331-x
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发表时间：
2017-06
影响因子：
1.6
通讯作者：
Paul A. Macklin;I. Santos;D. Maher;C. Sanders
中科院分区：
文献类型：
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作者：
Paul A. Macklin;I. Santos;D. Maher;C. Sanders
短寿命镭同位素（224 Ra和223 Ra）的分布进行了调查的黄金海岸水道，地球上最大的住宅河口运河系统之一，试图估计镭衍生的停留时间，并获得洞察镭同位素的来源。在约300公里水道的61个地点对运河表面和底部沃茨进行了采样。地下水中的镭同位素活性比河口沃茨高12倍。令人惊讶的是，镭的活动通常是较高的表面沃茨比底部沃茨意味着镭源与潮汐抽水在人工海滩沉积物。人工渠道表面沃茨中的镭年龄通常比自然河口水道中的镭年龄要年轻。研究表明，潮汐驱动的地下水镭源可以通过延长运河岸线来增强。
Distributions of short-lived radium isotopes (224Ra and223Ra) were investigated on the Gold Coast waterways, one of the largest residential estuarine canal systems on Earth, in an attempt to estimate radium-derived residence times and obtain insights into sources of radium isotopes. Surface and bottom canal waters were sampled in 61 locations over ~300 km of waterways. Radium isotope activities were 12-fold higher in groundwater than estuarine waters. Surprisingly, radium activities were usually higher in surface waters than bottom waters implying a radium source associated with tidal pumping in artificial beach sediments. Estimated radium ages were usually younger within artificial canal surface waters than in the natural estuarine waterways. This study shows that the tidally driven groundwater radium source can be enhanced by the extended canal shoreline.