Abstract
We have investigated, changes in the optic glass-fiber due to X-ray irradiation from the stand point of radiation chemistry.
Measurements of the absorption spectrum and the free electrons to the each sample of the optic glass-fiber which was irradiated by different X-ray dose, were made at room temperature with a Electron Spin Resonance apparatus. Measurements were taken immediately after and monthly follow up. Following conclusion were made after this study;
1. ESR absorption changes appeared in the optic glass-fiber at more than 100 R of exposure.
2. 300, 1000 and 2000 R of X-ray irradiation to the optic glass-fiber produced distnct ESR absorption curves and the shape of these curves were proportional to X-ray dose.
3. Thermal anneal phenomena were confirmed by ESR absorption curve data during monthly follow up. Thermal anneal occurs more rapidly in samples exposed to less irradiation.
4. ESR changes below 75 R of X-ray irradiation to the optic glass-fiber did not demonstrate ESR absorption curves, however, their existence is strongly suggested by data obtained at larger exposures.
