A novel method based on ~(220)Rn (thoron) exhalation rate of indoor surfaces for robust estimates of ~(220)Rn concentration and equilibrium factor to compute inhalation dose

Kanse S. D.; Sahoo B. K.; Gaware J. J.; Sapra B. K.

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A novel method based on ~(220)Rn (thoron) exhalation rate of indoor surfaces for robust estimates of ~(220)Rn concentration and equilibrium factor to compute inhalation dose

机译：基于〜（220）RN（Thoron）的新方法，用于室内表面的稳压估计〜（220）RN浓度和均衡因子计算吸入剂量的稳压

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The research into Rn-220 (thoron) has generated an increasing interest in recent times due to the realisation of its radiological importance in many indoor environments. Though it is assumed that the contribution of Rn-220, per se, to the inhalation dose is negligible in comparison with that of its decay products, this may not be always true. Correct estimation of inhalation dose due to thoron requires a reliable method to measure the concentration of both 220 Rn and its decay products in indoor air. However, due to its very short half-life (55.6 s) Rn-220 shows large variation in its indoor activity concentration. This makes it difficult to have a robust value of Rn-220 concentration which can be considered representative of a house, thus making the dose estimation unreliable. This issue has been addressed in the present study by developing a novel method that utilises the Rn-220 exhalation rate from indoor surfaces as the basis for estimation of average Rn-220 concentration in indoor air. The Rn-220 concentration estimated in this manner can be converted to decay products concentration using a suitable equilibrium factor and finally the inhalation dose using appropriate dose conversion factors. A wall mounting accumulator setup has been developed for easy in-situ measurement of Rn-220 exhalation from room surfaces. The method has been validated through comprehensive measurements in 25 dwellings in two different regions of India. The developed method is very good for large scale field surveys because of fast and easy applicability. (C) 2020 Elsevier Ltd. All rights reserved.

机译：由于在许多室内环境中实现了其放射性重要性，研究了RN-220（Thoron）的研究产生了越来越令的利益。虽然假设RN-220，本身的贡献与其腐烂产品的吸入剂量可以忽略不计，但这可能并非总是如此。由于钍的正确估计吸入剂量需要可靠的方法来测量室内空气中220 rn及其腐烂产品的浓度。然而，由于其非常短的半衰期（55.6秒）RN-220显示其室内活动浓度的大变化。这使得难以具有RN-220浓度的强大值，其可以被认为是房屋的代表，从而使剂量估计不可靠。本研究通过开发一种新的方法在本研究中解决了利用来自室内表面的RN-220呼气率作为室内空气中平均RN-220浓度的基础。以这种方式估计的RN-220浓度可以通过合适的平衡因子转化为衰减产品浓度，最后使用适当剂量转化因子的吸入剂量。已经开发出壁挂式蓄能器设置，以便于房间表面的RN-220呼气的易于原位测量。通过在印度的两个不同地区的25个住宅中通过全面测量验证了该方法。由于快速且易于适用性，开发方法非常适合大规模场测量。（c）2020 elestvier有限公司保留所有权利。

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来源
《Chemosphere》 |2021年第3期|128908.1-128908.10|共10页
作者
Kanse S. D.; Sahoo B. K.; Gaware J. J.; Sapra B. K.;
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作者单位

Bhabha Atom Res Ctr Radiol Phys & Advisory Div Mumbai 400094 Maharashtra India|Homi Bhabha Natl Inst Mumbai 400094 Maharashtra India;

Bhabha Atom Res Ctr Radiol Phys & Advisory Div Mumbai 400094 Maharashtra India;

Bhabha Atom Res Ctr Radiol Phys & Advisory Div Mumbai 400094 Maharashtra India;

Bhabha Atom Res Ctr Radiol Phys & Advisory Div Mumbai 400094 Maharashtra India|Homi Bhabha Natl Inst Mumbai 400094 Maharashtra India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
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关键词
Thoron; Indoor exposure; Exhalation rate; Wall mounting accumulator; Equilibrium factor; Inhalation dose;

机译：Thoron;室内曝光;呼气率;壁挂蓄能器;平衡因子;吸入剂量;

A novel method based on ~(220)Rn (thoron) exhalation rate of indoor surfaces for robust estimates of ~(220)Rn concentration and equilibrium factor to compute inhalation dose

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