Determination of Radon Solubilities to 1,2-Dimethylbenzene, 1,3-Dimethylbenzene, 1,4-Dimethylbenzene, 1,3,5-Trimethylbenzene, 1,2,4-Trimethylbenzene and 1-Isopropyl-4-methylbenzene

Masaaki SAITO*, Shigeru TAKATA, Noriko YAMAZAWA† and Kimiko HORIUCHI†

Radiation Lab., Tokyo Metropolitan Industrial Technology Research Institute; 2-11-1, Fukazawa, Setagaya-ku, Tokyo 158-0081 Japan
† Department of Environmental Information Science, Otsuma Women's University; 2-7-1, Karakida, Tama, Tokyo 206-0035 Japan

The molar fraction solubilities of radon x1 to 1,2-dimethylbenzene, 1,3-dimethylbenzene, 1,4-dimethylbenzene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene and 1-isopropyl-4-methylbenzene were determined. A radon solution was put in a closed vessel with air phase. Radon contents in the initial solution and the solution in which gas-liquid equilibrium had achieved, were measured by liquid scintillation counting. Radon content in the gas phase was obtained from the difference of the radon contents in the two solutions. Radon solubility was resulted from the ratio of liquid phase concentration to the gas phase concentration. The solubility formulas as a function of temperature were presented as follows in the range of 290--301 K.
1,2-Dimethylbenzene : x1=exp(1575.5/T−8.219),
1,3-Dimethylbenzene : x1=exp(1638.4/T−8.389),
1,4-Dimethylbenzene : x1=exp(1627.1/T−8.287),
1,3,5-Trimethylbenzene : x1=exp(1599.1/T−8.218),
1,2,4-Trimethylbenzene : x1=exp(2342.2/T−10.717),
1-Isopropyl-4-methylbenzene : x1=exp(2310.6/T−10.412).


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