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摘要
In this study, beryllium-7 (Be-7) concentrations of surface air were monitored throughout a span of 23 years (1992-2012) in the Taiwanese cities Yilan, Taipei, Taichung, and Kaohsiung. During this period, particulate matter (PM) concentrations, in terms of PM10, were collected monthly from the nearest air-quality pollutant monitoring stations and compared against Be-7 concentrations. Seasonal monsoons influenced Be-7 concentrations in all cities, resulting in high winter and low summer concentrations. In addition, the meteorological conditions caused seasonal PM10 variations, yielding distinct patterns among the cities. There was no correlation between Be-7 and PM10 in the case cities. The average annual Be-7 concentrations varied little among the cities, ranging from 2.9 to 3.5 mBq/m(3), while the PM10 concentrations varied significantly from 38 mu g/m(3) in Yilan to 92 mu g/m(3) in Kaohsiung depending on the degree of air pollution and meteorological conditions. The correlation between the Be-7 concentration and gross-beta activities (A(beta)) in air implied that the Be-7 was mainly attached to crustal PM and its concentration varied little among the cities, regardless of the increase in anthropogenic PM in air-polluted areas.
- 出版日期2014-7
- 单位长春大学; 清华大学
