Rodas Ceballos Melisa, Borràs Antoni, Gomila Esteve, Estela José Manuel, Cerdà Víctor, Ferrer Laura
Environmental Radioactivity Laboratory (LaboRA), University of the Balearic Islands, 07122 Palma de Mallorca, Spain.
Environmental Analytical Chemistry Laboratory (LQA(2)), University of the Balearic Islands, 07122 Palma de Mallorca, Spain.
Chemosphere. 2016 Jun;152:481-9. doi: 10.1016/j.chemosphere.2016.03.021. Epub 2016 Mar 19.
Measurements of airbone radionuclides (7)Be and gross beta (Aβ) jointly with atmospheric aerosols, i.e. particulate matter (PM) were routinely carried out for 10 years (2004-2014) at the University of the Balearic Islands, Spain. A total of 728 filter (0.8 μm pore size) samples were collected, and in all of them (7)Be and Aβ specific activities were detected. The maximum and minimum specific activities monitored were 0.73 ± 0.41 - 15.8 ± 1.26 mBq m(-3) of (7)Be and 0.14 ± 0.02 - 2.55 ± 0.04 mBq m(-3) of Aβ. PM concentrations were also determined, showing seasonal behavior with the highest concentration in summer and the lowest one in winter. Several meteorological parameters have been considered to explain this intra-annual variation. Principal component analysis (PCA) was applied to the dataset indicating that it is well represented by two principal components that explain 76.6% of total variance. Additionally, a second study with preliminary results of the specific activities of two natural radiotracers ((7)Be and (210)Pb) in PM10 samples was carried out. They were monitored for two years (2013-2015) in air of Mallorca Island. (7)Be and (210)Pb were detected in most of the PM10 filters, in 100% and 93% of them, respectively. The relationship between activities of both radionuclides and several relevant meteorological parameters was established at 95% confidence level. As a common result to PM and PM10 samples, a strong positive correlation between the evaluated radionuclides and temperature was found.
西班牙巴利阿里群岛大学在2004年至2014年的10年间，定期对空气中的放射性核素（7）铍和总β（Aβ）以及大气气溶胶，即颗粒物（PM）进行测量。共采集了728个孔径为0.8μm的滤膜样本，所有样本均检测到了（7）铍和Aβ的比活度。监测到的（7）铍比活度最大值和最小值分别为0.73±0.41 - 15.8±1.26 mBq m(-3)，Aβ比活度最大值和最小值分别为0.14±0.02 - 2.55±0.04 mBq m(-3)。还测定了PM浓度，其呈现出季节性变化，夏季浓度最高，冬季浓度最低。考虑了几个气象参数来解释这种年内变化。对数据集应用主成分分析（PCA）表明，它由两个主成分很好地表示，这两个主成分解释了总方差的76.6%。此外，还开展了第二项研究，对PM10样本中两种天然放射性示踪剂（（7）铍和（210）铅）的比活度进行了初步研究。在马略卡岛的空气中对它们进行了两年（2013 - 2015年）的监测。在大多数PM10滤膜中检测到了（7）铍和（210）铅，分别在100%和93%的滤膜中检测到。在95%置信水平下建立了两种放射性核素的活度与几个相关气象参数之间的关系。作为PM和PM10样本的共同结果，发现所评估的放射性核素与温度之间存在很强的正相关。
