| JIN Yihe,XIA Daoguo,ZHUO Weihai,XU Liya,FANG Guoqiu.Size distribution of atmospheric radioactive aerosols and its measurement[J].Chinese Journal of Radiological Medicine and Protection,1997,17(2):94-97 |
| Size distribution of atmospheric radioactive aerosols and its measurement |
| Received:August 28, 1995 Revised:February 26, 1996 |
| DOI： |
| KeyWords:Wire screen diffusion Size distribution Radisactive aerosols |
| FundProject:本研究由福建省医药卫生科研基金资助 |
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| Abstract:: |
| Objectives The variation of the size distribution of radioactive aerosols may cause a large fluctuation of lung dose caused by radon and its daughters.Since the information on the size distribution of radioactive aerosols in China is scanty,authors usually quote the recommended data by UNSCEAR（1988） to estimate the lung dose.In order to check whether the quoted data are reasonable and establish the method of measuring the size distribution of the aerosols,we carried out this study.Methods The penetration curve can be bloffed by measuring the atomospheric radioactiveity ratio for the different diffusion using the wire screen （165 meshes） type diffusion battery.The size distribution of atomospheric radioactive aerosols was calculated by ikebe anatical method. Results The size distribution for outdoors and indoors showed a geometric normal distribution. The arithmetic mean peak diameter for indoor and outdoor size distribution were （0.20±0.09） μm and （0.27±0.11） μm,respectivery.The correlation between the size distribution and the concentrations of radon and meteological factors was not significant.Conclusion The measured result for indoors is the same as the recommended data by UNSCEAR（1988）,while the result for outdoors is slightey higher than the recommended data,but it is similiar to that reported by Jacobi. It is basically feasible for Fujian Province to estimate lung dose using the recommented data by UNSCEAR（1988）. Futher studies are needed to extend this conclution nationwide. |
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