著者

古田 悦子 森田 裕子 吉沢 幸夫

出版者

日本保健物理学会

雑誌

保健物理 : hoken buturi (ISSN:03676110)

巻号頁・発行日

vol.42, no.4, pp.341-348, 2007-12

被引用文献数

1 2

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Internal exposure to alpha particles emitted from <222>^Rn (radon) and its daughters is the second leading cause of lung cancer. As a source of indoor radon in home, there are interior building materials that contain radioactive minerals. These radioactive consumer products have been claimed by distributors to have effect of "minus-ion" or "radon spring" for healthy promotion. We analyzed radioactive nuclides contained in the interior building materials, and measured radon levels released from them. The results of gamma-ray spectrometry revealed that these interior building materials contain U- and Th-series nuclides. The densities of some radioactive nuclides in the tile used for a bathroom exceeded the exempt limits of International Basic Safety Standards. However, the radon densities released from the tile was lower than detectable limit. In contrast, one of the wallpaper released 34Bq・m^<-3> of radon gas in a 50-liter container. This value is two times higher than the average radon level in Japanese homes. The "minus-ion effect" wallpapers are thought to be a cause of residential exposure to radon.

著者

森田 裕子 水村 亮介 橘 義貴 金澤 秀子

出版者

The Japan Society for Analytical Chemistry

雑誌

分析化学 = Japan analyst (ISSN:05251931)

巻号頁・発行日

vol.62, no.6, pp.541-545, 2013-06-05

参考文献数

14

被引用文献数

2

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Cation exchange resins (calcium polystyrene sulfonate, Ca-resin and sodium polystyrene sulfonate, Na-resin) have been used as agents to improve hyperkerlemia. For removing ¹³⁷Cs from the human body, the adsorption ability of the resin for ¹³⁷Cs was examined and evaluated. Resin (0.03 g) and ¹³⁷Cs (ca.1 kBq) were introduced into 3 mL of water, the Japanese Pharmacopoeia 1st fluid for a dissolution test (pH 1.2) and 2nd fluid (pH 6.8), respectively, and shaken. After 1-3 hours, the ¹³⁷Cs adsorption (%) of Na-resin was 99% in water, 60% in a pH 1.2 fluid and, 66% in a pH 6.8 fluid. By adding potassium, the ¹³⁷Cs adsorption (%) of Ca-resin was reduced. However, the ¹³⁷Cs adsorption (%) of Na-resin was almost unchanged. These results show that both resins have adsorption ability for ¹³⁷Cs in the stomach and the intestines. Therefore, the proposed method will be an effective means in the case of a radiological emergency due to ¹³⁷Cs.

著者

森田 裕子 水村 亮介 橘 義貴 金澤 秀子

出版者

公益社団法人 日本分析化学会

雑誌

分析化学 (ISSN:05251931)

巻号頁・発行日

vol.62, no.6, pp.541-545, 2013-06-05 (Released:2013-06-27)

参考文献数

14

被引用文献数

2

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Cation exchange resins (calcium polystyrene sulfonate, Ca-resin and sodium polystyrene sulfonate, Na-resin) have been used as agents to improve hyperkerlemia. For removing 137Cs from the human body, the adsorption ability of the resin for 137Cs was examined and evaluated. Resin (0.03 g) and 137Cs (ca.1 kBq) were introduced into 3 mL of water, the Japanese Pharmacopoeia 1st fluid for a dissolution test (pH 1.2) and 2nd fluid (pH 6.8), respectively, and shaken. After 1-3 hours, the 137Cs adsorption (%) of Na-resin was 99% in water, 60% in a pH 1.2 fluid and, 66% in a pH 6.8 fluid. By adding potassium, the 137Cs adsorption (%) of Ca-resin was reduced. However, the 137Cs adsorption (%) of Na-resin was almost unchanged. These results show that both resins have adsorption ability for 137Cs in the stomach and the intestines. Therefore, the proposed method will be an effective means in the case of a radiological emergency due to 137Cs.