St Petersburg University, Universitetskaya Nab 7/9, St Petersburg 199034, Russia.
J Environ Radioact. 2010 Jun;101(6):458-63. doi: 10.1016/j.jenvrad.2008.06.004. Epub 2008 Jul 22.
Large part of available literature on biogeochemistry of uranium and thorium refers to the studies performed either in highly contaminated areas or in nutrient solutions that have been artificially 'spiked' with radionuclides. Effects of background levels of natural radioactivity on soil-grown plants have not been studied to the same extent. In this paper, we summarised results of greenhouse and field experiments performed by the author from 2000 to 2006. We examined some of the factors affecting transfer of U and Th from soil to plants, differences in uptake of these radionuclides by different plants, relationships between U and Th in soil and in plants, and temporal variations of U and Th in different plant species. Concentrations of radionuclides (critical point for experimental studies on biogeochemistry of U and Th--rare trace elements in non-contaminated regions) and essential plant nutrients and trace elements were determined by instrumental neutron activation analysis.
大量有关铀和钍的生物地球化学的可用文献参考了在高度污染地区或在人为添加了放射性核素的营养溶液中进行的研究。背景天然放射性对土壤生长植物的影响尚未在同一程度上进行研究。在本文中，作者总结了 2000 年至 2006 年进行的温室和田间实验的结果。作者研究了一些影响铀和钍从土壤向植物转移的因素，不同植物对这些放射性核素的吸收差异，土壤和植物中铀和钍之间的关系，以及不同植物物种中铀和钍的时间变化。放射性核素浓度（研究铀和钍生物地球化学的临界点——非污染地区的稀有微量元素）和必需植物养分及微量元素通过仪器中子活化分析来确定。
