Study of Induced Chemiluminescence in Tracks Detector Exposed to Gamma Radiation During Thermal Treatments.

Abstract

In this work, three independent chemiluminescence processes were found, through thermal degradation of gamma irradiated cellulose nitrate and cellulose acetate solid state nuclear tracks detectors. These processes can be summarized by:-
The low temperature induced chemiluminescence which depends on the absorbed dose, temperature and the composition of the surrounding atmosphere during irradiation. This weak chemiluminescence is attributed to the decay of charge transfer complex between oxygen and hydroxyl radicals formed in the detectors. Second process was a peak in chemiluminescence at 338oK associated with decomposition of peroxide groups presents in the detectors .
Third process was, as temperature approaching 343oK, an intense chemiluminescence was found to correlate with polymer chain scissions, resulting in the decrease in chain degree of polymer.
The above results show that chemiluminescence is a good tool to study radical degradation mechanisms. Also it explains why these detectors are not useful for gamma rays dosimetry.

Keywords

فيزياء