著者

古川 知恵美 吉井 裕美 細野 清志

出版者

日本エアロゾル学会

雑誌

エアロゾル研究 (ISSN:09122834)

巻号頁・発行日

vol.28, no.2, pp.150-154, 2013 (Released:2013-07-06)

参考文献数

14

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While airborne emission of radioactive cesium (Cs) from contaminated biomass by fire has been studied, only few data is publicly available with regard to the transfer of Cs in tobacco leaf to tobacco smoke. The purpose of this study was to investigate the fate of Cs during cigarette smoking, utilizing stable cesium isotope (133Cs) which is naturally contained in tobacco leaf. In order to calculate the transfer rate, mainstream and sidestream smoke from four brand styles of commercial cigarettes were collected with a machine-smoking method. Ash and butts from the smoked cigarettes of two out of the four brand styles were also collected for the estimation of mass balance. After digestion, those collected samples were analyzed with ICP-MS to determine the amount of 133Cs, and the amounts were compared with the original concentration in the cigarettes examined. The transfer rates of 133Cs into the mainstream smoke were proportional to the tar-level of each cigarette, whereas those into sidestream smoke were almost similar among the brand styles investigated. The maximum transfer rates into mainstream and sidestream smoke were 0.35% and 0.57%, respectively, and almost all 133Cs in tobacco was retained in ash and cigarette butts.

著者

吉井 裕人

雑誌

情報処理学会研究報告ゲーム情報学(GI)

巻号頁・発行日

vol.2000, no.52(2000-GI-003), pp.33-40, 2000-05-31

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本論文では、ゲームのフラクタル仮説というゲームの構造にかんする仮説を提出する。この仮説を元に、ゲームが面白いとはどういうことか?について議論していく。以前行った囲碁に関するパターンの統計研究をレビューし、心理学実験の方針について提案を行う。

著者

吉井 裕

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.47, no.2, pp.97-101, 2012 (Released:2012-12-07)

被引用文献数

1