保健物理

人体呼吸器官内のエアロゾル粒子沈着量の新しい計算モデル

高橋幹二, 伊藤春海

1974 年 9 巻 1 号 p. 3-10
発行日: 1974年
公開日: 2010/02/25

DOIhttps://doi.org/10.5453/jhps.9.3

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A new computational model for deposition of particles inhaled in human respiratory systems were proposed. Weibel's model was used as a standard human lung. The calculations were performed by the similar method to Landahl's, Beeckmans' and others', with the exception of newly proposed equations for the particle deposition by impaction in the diverged parts and by tranquil diffusion in the straight parts. The calculated results were somewhat different from the ICRP's, and some examples of regional distributions of particle deposition in human lung were shown.

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ゼオライトによる水溶液からの¹³⁷Csの除去

加藤清

1974 年 9 巻 1 号 p. 11-16
発行日: 1974年
公開日: 2010/02/25

DOIhttps://doi.org/10.5453/jhps.9.11

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For the purpose of using zeolite together with polymer coagulant in the chemical treatment of low-level radioactive liquid wastes, the experiments were carried out on the removal of ¹³⁷Cs by natural zeolite under different conditions.
Cation exchange capacities of natural zeolites produced in Japan were determined on powdered condition by means of batch method. Results obtained show that cation exchange capacities of natural zeolites, clinoptilolite and mordenite are 134-156meq Cs⁺/100g and 170-183meq Cs⁺/100g, respectively.
The removal of ¹³⁷Cs by the zeolite which had the highest cation exchange capacity among them tested, was studied. The removal efficiency of both natural and Na-form zeolite was more than 95% under the following condition: concentration of 500ppm, pH of 2-11, Na⁺<250ppm, K⁺<50ppm, NH₄⁺<25ppm, Ca²⁺<1, 000ppm and Cs<10^-4M/l as a carrier. The removal efficiency from tap water was about 99% with 250ppm of zeolite. The combined use of 500ppm zeolite and 5ppm nonionic polymer coagulant was particularly effective for the removal of ¹³⁷Cs.

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イリジウム-192による被曝事故について

熊取敏之, 加藤義雄

1974 年 9 巻 1 号 p. 17-21
発行日: 1974年
公開日: 2010/02/25

DOIhttps://doi.org/10.5453/jhps.9.17

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