量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
Thank you very much for using our website. On the 11th of March 2019, this site was moved from our own network server to the JAIRO Cloud network server. If you previously bookmarked this site, that bookmark will no longer work. We would be grateful if you could bookmark the website again. Thank you very much for your understanding and cooperation.
Recently, several case-control studies have indicated an increased risk of lung cancer linked to indoor radon exposure. These studies often used the passive-type radon detectors, and the reading of these detectors without thoron discrimination techniques would be overestimated by thoron. Therefore, to evaluate the effect of overestimation in radon concentration, we conducted a simulation study. We assumed a case-control study of lung cancer and indoor radon with hypothetical data where radon concentrations were measured with and without discrimination of thoron concentration. The thoron interference in radon measurement resulted in an approximately 90% downward bias in the effect of radon, and this bias was affected by radon and thoron concentration, and radon detector. However the bias was almost constant when the other parameters were varied.
会議概要（会議名, 開催地, 会期, 主催者等）
12th International Congress of the International Radiation Protection Association
A Simulation Study of Lognormal Measurement Error Effect - Discrimination Problem of Radon and Thoron
