Abstract
It was shown in this laboratory (1, 2) that when wood cellulose with a low moisture content (0.26 %) was irradiated in air with y-rays and stored in vials, there was a progressive decrease in its viscosity in cupriethylenediamine up to 30 days after the first measurement. This decrease was referred to as an after-effect, as opposed to the primary effect which is the difference between the viscosity of the control (unirradiated) sample and that of the irradiated sample measured as soon as possible after the end of irradiation. When these low-moisture samples were irradiated, then wetted with excess water or freely exposed to air, the after-effect was curtailed (2). Samples irradiated at higher moisture levels (3.3 % to 5.6 %) showed no after-effect. It was concluded that the curtailment or prevention of the after-effect may be due to either water or oxygen. The present investigation was undertaken to determine the influence of water and oxygen on the after-effect in the -y-ray irradiation of cellulose.
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