EFFECTS OF HEAT-TREATMENT AND GAMMA-RAY IRRADIATION ON THE ETCH-PIT FORMATION IN ALLYL DIGLYCOL CARBONATE RESIN

摘要

Allyl diglycol carbonate resin plates possessing alpha tracks were etched after heat-treatment, or after gamma-ray irradiation. The strong heat-treatment and irradiation brought similar effects to two indicators: etch-pit diameter and bulk etching rate. The heat-treatment above 120 degrees C lasting for Ih and irradiation above 4.0x10(2) Gy increased the indicators and caused the etch-pits to disappear faster. On the other hand, mild heat-treatment brought the opposite effects to under-cured resin. A reduction of the etch-pit diameter was observed in the resin exposed to heat-treatments between 80 degrees C and 120 degrees C lasting for Ih. These phenomena were observed in the study of plates in which alpha tracks were made after the above mentioned heat-treatment or irradiation. These results suggest not only the conditions under which the resin may be used; but also the possibility of enhancement or suppression of etching speed, and of estimation of thermal history or measurement of gamma-ray dosage. [References: 10]