Gamma emitters in atmospheric precipitation in Krakow (Southern Poland) during the years 2005-2015
Gamma emitters in atmospheric precipitation in Krakow (Southern Poland) during the years 2005-2015
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DOI：
10.1016/j.jenvrad.2016.02.010
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发表时间：
2017-01-01
影响因子：
2.3
通讯作者：
Kierepko, Renata
中科院分区：
文献类型：
--
作者：
Mietelski, Jerzy W.;Nalichowska, Ewa;Kierepko, Renata
介绍并讨论了克拉科夫（波兰南部）10 年来（2005 年 8 月至 2015 年 7 月）收集的样品中天然存在的 Be-7、Pb-210、K-40、Na-20 和人为 Cs-137 放射性核素的干湿活度沉降总和结果。使用 HPGe 探测器的低背景伽马能谱测定放射性核素。此外，本文还显示了 7 年期间（2008 年 8 月至 2015 年 7 月）空气降水水中 Be-7、Pb-210、Na-22、K-40 和 Cs-137 放射性同位素的活度浓度结果。对于所有这些系列，进行了统计分析，包括 Speamian 相关性、季节性变化的影响和多元回归模型。排除 2011 年受福岛事故影响的两个月后，发现宇宙成因放射性核素 Be-7 和 Na-22 对（R = 0.508）以及 Pb-210 和 Be-7 之间（R = 0.570）的活度沉积具有高 Spearman 相关因子（R > 0:5）。 Be-7 的活动沉积和降水量之间存在高度相关性 (R = 0.677)。研究了 Be-7-Na-22、K-40-Cs-137、Pb-210-Cs-137 和 Be-7-Pb-210 之间的季节相关性，K-40-Cs-137 对的最高相关系数 R = 0.731 在春季。秋季的 Pb-210 和 Be-7 (R = 0.594)、夏季的 K-40-Cs-137 (R = 0.582)、春季的 Be-7 -Na-22 (R = 0.635) 和秋季的 Pb-210-Cs-137 (R = 0.672) 之间也观察到高度相关性。多元回归方法显示了宇宙放射性核素和陆地放射性核素清除机制的有趣差异。根据该模型，宇宙成因核素的沉积与降水量显着相关，而陆地放射性核素的沉积则没有表现出这种依赖性。 (C) 2016 Elsevier Ltd. 保留所有权利。
The results of the sum of dry and wet activity deposition for naturally occurring Be-7, Pb-210, K-40, Na-20 and anthropogenic Cs-137 radionuclides in Krakow (Southern Poland) for the samples collected over 10 years (from August 2005 to July 2015) are presented and discussed. The radionuclides were determined using low background gamma spectrometry with HPGe detectors. Additionally, in this paper there are shown the results of activity concentrations in water from air precipitation for Be-7, Pb-210, Na-22, K-40 and Cs-137 radioisotopes from the period of 7 years (from August 2008 to July 2015). For all these series the statistical analysis including Speamian correlations, effects of seasonal variation and multiple regression models were conducted. After excluding two months from 2011 affected by the Fukushima accident, high Spearman correlation factors (R > 0:5) for activity deposition were noticed for the pair of the cosmogenic radionuclides Be-7 and Na-22 (R = 0.508) and between Pb-210 and Be-7 (R = 0.570). High correlation was noted between activity deposition and amount of precipitation for Be-7 (R = 0.677). The seasonal cor-relations between Be-7-Na-22, K-40-Cs-137, Pb-210-Cs-137 and Be-7-Pb-210 were investigated and the highest correlation coefficient R = 0.731 for the K-40-Cs-137 pair was in the spring season. High correlations were observed also between Pb-210 and Be-7 for autumn (R = 0.594), K-40-Cs-137 in summer (R = 0.582), Be-7 -Na-22 in spring (R = 0.635) and Pb-210-Cs-137 in autumn (R = 0.672). The multiple regression approach showed the interesting difference in scavenging mechanisms of cosmogenic and terrestrial radionuclides. According to that model, the deposition of cosmogenic nuclides was noticeably related to the amount of precipitation, while the deposition of terrestrial radionuclides did not show such dependence. (C) 2016 Elsevier Ltd. All rights reserved.