کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1737858 1521586 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A cluster analysis of back trajectories to study the behaviour of radioactive aerosols in the south-east of Spain
ترجمه فارسی عنوان
تجزیه و تحلیل خوشه ای از مسیرهای برگشتی برای مطالعه رفتار آئروسل های رادیواکتیو در جنوب شرقی اسپانیا
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
چکیده انگلیسی


• African mineral dust at 3000 m increase the activity concentration of 7Be-aerosols.
• Saharan intrusions close to boundary layer could remove 7Be-aerosols from troposphere.
• The raise of suspended particulates in the atmosphere increase the Gross β activity.
• Mediterranean and African air masses favour the entrance of β radionuclides.

This research is focused on the study of the influence of the air masses together with the local meteorological fluctuations on the amount of radioactive elements in aerosols at surface air of the southeastern of Iberian Peninsula. The radioactivity in aerosols has been determined by measuring the concentration activity of Gross β and 7Be from January 4th, 2011 to December 31st, 2013. The activity concentration (Bq/m3) of gross beta was measured by α/β Low-Level counter, whereas the activity concentration of 7Be (Bq/m3) was detected by gamma spectrometry (Eγ = 477.6 KeV, Yield = 10.42%). The air mass origings have been set using k-means clustering analysis of daily 72-h kinematic 3D backward trajectories at 500 m, 1500 m and 3000 m of altitude. Finally, a multiple Regression Analysis (MRA) have been carried out in order to determine the influence of the origins and trajectories of the air masses and local meteorology variations on the evolution of Gross β and 7Be activity concentration. In conclusion, the results of the current research demonstrate that the re-suspended mineral dust from Northern Africa transported by Mediterranean air masses at low altitude (500 m) and African air masses at high altitude (3000 m) increases the radioactivity concentration in aerosols at the surface atmosphere. In addition, the opposite influence of the Saharan intrusions at 1500 m of altitude on the behaviour of 7Be aerosols deserves special attention.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 147, September 2015, Pages 142–152
نویسندگان
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