Vertical Distribution of Radon Concentrations in the Atmosphere

机译：大气中Rad浓度的垂直分布

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Vertical distributions of radon (~(222)Rn) concentrations were measured up to 5 km in the atmosphere around central Japan. About 50 L air was sampled in a Tedlar® (polyvinyl fluoride, PVF) bag by using an aircraft. The ~(222)Rn concentrations in the bags were measured with electrostatic radon monitor. The detection limit is 0.10 Bq·m~(-3) for measuring time of 6 h. The measured concentrations were corrected by considering ~(222)Rn decay rate and the atmospheric pressure at the sampling altitude. The ~(222)Rn concentration decreases rapidly with increasing altitude. The high ~(222)Rn concentrations were observed at about 500 and 1000 m under atmospheric boundary layer over the land areas. The ~(222)Rn concentrations sampled over the sea were lower due to no ~(222)Rn exhalation from the sea surface. The vertical distribution could be explained fairly well by using the analysis of air mass trajectory and one dimensional diffusion model.

机译：在日本中部大约5 km的大气中测量了（（〜（222）Rn）浓度的垂直分布。使用飞机在Tedlar®（聚氟乙烯，PVF）袋中采样约50 L的空气。用静电ra监测仪测量袋中的〜（222）Rn浓度。检测时间为6 h时，检出限为0.10 Bq·m〜（-3）。考虑到〜（222）Rn衰减率和采样高度下的大气压，对测得的浓度进行校正。〜（222）Rn浓度随海拔升高而迅速降低。在陆地区域大气边界层下约500和1000 m处观测到高〜（222）Rn浓度。由于没有从海面呼出〜（222）Rn，因此海上采样的〜（222）Rn浓度较低。利用空气质量轨迹分析和一维扩散模型可以很好地解释垂直分布。

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来源
《Radon and thoron in the human environment》|1997年|246-251|共6页
会议地点 Fukuoka(JP)
作者
Takao Iida; Katsumi Yamada; Hideyuki Miyachi; Yasunobu Iwasaka; Katsuji Matsunaga; Takashi Ishizaka;
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作者单位

Graduate School of Engineering, Nagoya University, 464-01, Japan;

Graduate School of Engineering, Nagoya University, 464-01, Japan;

Graduate School of Engineering, Nagoya University, 464-01, Japan Present address: Chubu Soft Engineering Inc.;

Solar-Terrestrial Environment Laboratory, Nagoya University;

Solar-Terrestrial Environment Laboratory, Nagoya University;

Institute for Hydrospheric-Atmospheric Sciences, Nagoya University;

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原文格式 PDF
正文语种 eng
中图分类放射性元素、放射化学;放射卫生;
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Vertical Distribution of Radon Concentrations in the Atmosphere

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