Abstract

In order to investigate the nature and formation mechanism of color centers in KCl formed by gamma irradiation at low temperatures, the thermal bleaching curve of F centers was measured. The irradiated specimens were warmed at a rate of about 1 deg C/min. Sharp decreases in F centers occurred at temperatures of 98, 116, 172, 256, and 278 deg K, in addition to a gradual decrease with increasing temperature. This decrease appeared to be due to the thermal decomposition of V centers since F centers are stable thermally in this temperature range. (M.C.G.)

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