试验室中 220Rn 及其子代循环研究

Sathish L A
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摘要

220Rn 在室内和工业环境中的数据有限,因为人们普遍认为,由于其半衰期较短,其浓度很低,因此,由于存在大量的环境辐射源,其参与呼吸的剂量被忽略了。室内 222Rn 及其半衰期产生的有效剂量几乎占天然辐射源的一半。然而,在亚洲大陆进行的室内研究表明,从 222Rn 及其后代中摄入的剂量可能并不比从 220Rn 中摄入的剂量低多少,甚至可能更多。有鉴于此,我们努力跟踪印度班加罗尔的 220Rn 水平分布。剂量计被放置在整个房间的墙壁、天花板和地板上,间隔固定。为了分析距离上的差异,所有门窗都关闭了 90 天。此外,剂量计被放置在上下抛物线配置中。使用基于硝酸纤维素的核轨道探测器(SSNTD)来检测测试室内的 220Rn 和 222Rn。当探测器远离房间的墙壁、天花板和地板时,浓度会更高。这项研究涉及测量房间内 220Rn 分布的技术问题。研究结果与文献中提供的本底辐射水平较高的住宅和地区的数据进行了对比。
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Study of 220Rn and its Progeny Circulation in a Test Room
Data for 220Rn in indoor and industrial environments are limited since it is widely accepted that its concentrations are meager on account of its diminutive half life, so its participation to respiration dose is disregarded on account of the incidence of considerable sources of ambient radiation. An effective dose from indoor 222Rn and its half springs accounts for almost half to the sources of natural radiation. However, indoor studies carried out in Asian continent imply the dose intake from 222Rn and its progeny may not be much lower than, or possibly more than, that from 220Rn. In light of this, an effort has been made to track Bangalore, India's 220Rn level distribution. Dosimeters were positioned throughout the room at fixed intervals from the wall, ceiling, and floor. To analyze the variances with respect to distance, all windows and doors were shut for 90 days. Additionally, dosimeters were placed in an upper and lower parabolic configuration. Cellulose Nitrate based Nuclear Track Detector (SSNTD) was used to examine the 220Rn coupled with 222Rn in test room. Higher concentrations were seen when the detector was moved away from the walls, ceiling, and floors of the room. This study covers the technical aspects of measuring the 220Rn distribution in a room. The findings are contrasted with figures provided in the literature for residences and regions with high background radiation levels.
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