Chemical Changes in the Chloroform-Paraffin System lrradiated by 60Co γ-rays. I. Examinations on Variable Factors

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It has been reported that the chloroform-paraffln-dye system have excellent sensitivity for radiation as a solid chemical dosimeter or a phantom. However, the chemical changes in the irradiated system are not examined in detail. In the present study, the effect of paraffin on changes in the above system of a liquid state irradiated by ^<60>Co γ-rays was examined by using various normal parafiin, and the other variable factors on the changes were done. When the chloroform solution and the solution containing 25 per cent of paraffin by volume with 5.0x15^<-5>mol/liter of Methyl Yellow as a dye were irradiated by 2000 R, G values for the formation of hydrogen chloride in the both solutions were 8. 4 and 10.8, respectively, and were little affected by the kind of those, from C_6 (hexane) to C_<36> (hexatria-contane). These results suggest that chlorine radical formed by radiolysis of chloroform may react with hydrogen atom from paraffin, thereby increasing the amount of hydrogen chloride. Presence of oxygen increased G value of the chloroform solution from 7.6 to 8.4, but did little that of the solution containing paraffin. The representative of the chemical dosimetry of radiation is the Fricke dosimetry, having been in practical use extensivly. Among the chemical measurements, the dosimeter using a dye has a high sensitivity and measurement of a low dose is possible. For this reason, attempts have been made to measure directly the absorption dose by this method, selecting substances having density and absorption coefficient equal to those of the biolo ical tissues.
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Chemical Changes in the Chloroform-Paraffin System lrradiated by 60Co γ-rays. I. Examinations on Variable Factors

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