| 金益和,下道国,卓维海,徐利亚,方国秋.天然放射性气溶胶的粒径分布及其测量方法[J].中华放射医学与防护杂志,1997,17(2):94-97 |
| 天然放射性气溶胶的粒径分布及其测量方法 |
| Size distribution of atmospheric radioactive aerosols and its measurement |
| 投稿时间：1995-08-28 修订日期：1996-02-26 |
| DOI： |
| 中文关键词: 网筛扩散法 粒径分布 气溶胶 |
| 英文关键词:Wire screen diffusion Size distribution Radisactive aerosols |
| 基金项目:本研究由福建省医药卫生科研基金资助 |
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| 中文摘要: |
| 目的 天然放射性气溶胶粒径分布的变化会引起氡及其子体所致肺剂量的较大涨落。由于我国对其报道甚少,在肺剂量估算中均引用UNSCEAR的推荐值。为验证这种引用的合理性和建立气溶胶粒径分布的测量方法,开展本项研究。方法 采用金属丝网筛(165目)扩散法测量天然空气经不同数目网筛扩散前后的放射性浓度比(衰减比)来绘制衰减曲线,然后用池边模式计算出粒径分布曲线。衰减比、粒径分布的计算和曲线的绘制均采用计算机。结果 室内外天然放射性气溶胶粒径呈几何正态分布,分布的峰值的平均值分别为(0.20±0.09)μm和(0.27±0.11)μm。粒径分布和氡浓度、气压、气温、湿度等未发现相关关系。结论 本研究结果与UNSCEAR报告书(1988)的推荐值相比,室内值相同,室外值略高,与Jacobi的研究相近。由此可得出结论,福州地区引用UNSCEAR报告书的推荐值来估算氡及其子体所致肺剂量是合适的。此结论能否推广到其他地区,还需作进一步的研究。 |
| 英文摘要: |
| 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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