1963 年 83 巻 2 号 p. 203-206
In order to examine the physical and chemical effect of powerful radioactive rays on liquid organic compounds, especially on unsaturated fatty acids, effect of irradiation of γ-rays from cobalt-60 of 16000 curie was examined. Changes resulting from irradiation were examined by gas chromatography and by infrared absorption spectrum. Electric conductivity during irradiation was measured by a special measuring cell possessing a wide electrode area, devised by the present authors.
No change was observed in unsaturated fatty acid esters of 18 carbon atoms when irradiated with the dose of about 106 roentgen, in oxygen-free state. Electric conductivity during the irradiation was found to be proportional to the square root of dosage rate at a constant temperature, within a range of dosage rate of 104 to 106 r/hr., but that the conductivity returned to the pre-irradiation level within a few hours upon removal of the irradiation source. This fact is considered to be of help in elucidating the mechanism of chemical reaction under radio-active ray irradiation and could also be applied for measuring a large dosage rate.