放射性ヨウ化メチルの空気中における光吸収スペクトル

概要

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The light absorption spectrum of radioactive methyl iodide vapor in the air was studied to clarify photolysis of radioactive methyl iodide by sunlight, which is a major factor in chemical form change of radioiodine in the environment. The reaction vessels containing radioactive methyl iodide vapor(6×10-7g/cm3, 0.3mCi/g)and air were exposed to monochromatic light of a specific wavelength in the region of 180-400nm. The rates of methyl iodide photodissociation and elemental iodine production were measured by Maypack sampler and gas chromatograph. The light absorption spectrum of methyl iodide was determined from these data. The absorption coefficient of radioactive methyl iodide had maxima at wavelengths 200 and 260nm respectively and a minimum at 220nm; the absorption coefficient decreased rapidly with increasing wavelength beyond 260nm. There was no effect of air as medium on the absorption spectrum.
一般社団法人日本原子力学会の論文