title: Annual cycle of gross beta activities in aerosol around Daya Bay area, China.
abstract: In this paper, the monthly gross beta activities in aerosol during 1995-2004 at Daya Bay area are reported. The gross beta activities were observed to vary in the range of 0.22-5.14 mBq m(-3) with an arithmetic average of 1.60+/-1.00 mBq m(-3) and a geometric average about 1.78+/-0.33 mBq m(-3). It is shown an obvious seasonal variation characteristic, which is ascribed to the washout mechanism and the radon-suppressing mechanism from the soil by the seasonal rainfall. The exponential attenuation with the rainfall is verified and an attenuation index is defined, which is deduced as 0.007+/-0.002 mm(-1) by regression analysis. Finally, the correlation between gross beta activities and (210)Pb concentrations is analyzed. It is indicated that the radionuclide (210)Pb contributes about 61+/-9% to the gross beta activities in the aerosol.
authors.affiliation: Suzhou Nuclear Power Research Institute, China Guangdong Nuclear Power Group, Suzhou 215004, China. hyj1231@gmail.com
authors.forename: Yan-Jun
authors.initials: YJ
authors.lastname: Huang
authors.forename: Yun-Liang
authors.initials: YL
authors.lastname: Tao
authors.forename: Jun
authors.initials: J
authors.lastname: Lin
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Shang-Guan
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D001608:Beryllium / Q000032:analysis; D001610:Beta Particles; D002681:China; D007856:Lead Radioisotopes / Q000032:analysis; D011834:Radiation Monitoring; D011868:Radioisotopes / Q000032:analysis; D011886:Radon / Q000032:analysis; D011891:Rain; D012621:Seasons
chemical_list: D000336:Aerosols; D000396:Air Pollutants, Radioactive; D007856:Lead Radioisotopes; D011868:Radioisotopes; D001608:Beryllium; D011886:Radon