Dowdall M, Bondar Y, Skipperud L, Zabrotski V, Pettersen M Nandrup, Selnæs Ø G, Brown J E
Norwegian Radiation Protection Authority, Østerås, Norway.
Polessie State Radiation-Ecological Reserve, Khoiniki, Belarus.
J Environ Radioact. 2017 Sep;175-176:60-69. doi: 10.1016/j.jenvrad.2017.04.009. Epub 2017 Apr 22.
The effects of fire events on contaminant radionuclides within soils of the Belarusian Exclusion Zone were investigated. A number of cores were taken from locations known to have been subject to fire events in the past as well as a series of cores from nearby unburnt locations. Both burnt and unburnt cores were analyzed for contaminant radionuclides as well as a range of relevant soil parameters. The distribution of Cs between various fractions (reversibly bound, irreversibly bound and insoluble) was analyzed. Results indicate no evidence of enhancement or enrichment of radionuclides within the soil column although this does not negate the possibility that such effects were evident at some point in the past, the fire events at two of the sites having occurred almost ten years earlier. Evidence was present of a persistent effect on how Cs was distributed between different fractions of the soil, primarily in relation to the proportions associated with oxides of Fe and Mn and organic matter. The results of the study appear to indicate that the long-term effects of a forest fire on contaminant Cs within the soil column are expressed through changes in the physico-chemical forms of the nuclide to a larger extent than simple redistribution of the contaminant within the soil column.
对白俄罗斯禁区土壤中污染物放射性核素的火灾事件影响进行了调查。从已知过去曾发生火灾事件的地点采集了一些岩芯，以及从附近未燃烧地点采集的一系列岩芯。对燃烧和未燃烧的岩芯都进行了污染物放射性核素以及一系列相关土壤参数的分析。分析了铯在不同组分（可逆结合、不可逆结合和不溶性）之间的分布。结果表明，土壤柱内没有放射性核素增强或富集的证据，尽管这并不排除过去某个时候存在这种影响的可能性，其中两个地点的火灾事件几乎发生在十年前。有证据表明，火灾对铯在土壤不同组分之间分布的影响持续存在，主要与铁和锰的氧化物以及有机物相关的比例有关。研究结果似乎表明，森林火灾对土壤柱内污染物铯的长期影响，在很大程度上是通过核素物理化学形式的变化来体现的，而不仅仅是污染物在土壤柱内的简单重新分布。
