Journal
APPLIED RADIATION AND ISOTOPES
Volume 120, Issue -, Pages 7-10Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2016.11.014
Keywords
Thoron; Passive-type radon-thoron discrimination monitor; Spatial distribution; Equilibrium factor; Dose estimation
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Funding
- Grants-in-Aid for Scientific Research [26305021] Funding Source: KAKEN
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This paper describes importance of Rn-220 (hereafter thoron) progeny measurement for the dose estimation. Although the spatial distribution of thoron activity concentration strongly depends on the distance from wall surface as an indoor thoron source), a homogeneous distribution was expected to be observed for Pb-212 activity concentration which was one of thoron progeny. Furthermore, the mean equilibrium factor for thoron obtained by the recent measurements in several cotintries widely ranged from 0.008 to 0.07. Therefore the bronchial dose evaluated using the equilibrium factor and activity concentration of thoron instead of thoron progeny activity concentration may have a large uncertainty. Thus, the thoron progeny measurement should be investigated at each measurement point for the dose estimation for thoron.
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