Studies on Nonmetals During Irradiation: The Growth and Decay ofFCenters in KCl at 20°C

In KCl the $F$ center versus dose curves obtained by making absorption measurements during gamma-ray irradiation differ considerably from those made by irradiating a crystal and then transferring it to a spectrophotometer. When the source is "turned off" the absorption drops abruptly for approximately 30 min and more slowly thereafter. The growth is accurately described by a sum of three saturating exponential terms and one linear term; the decay by the sum of four decreasing exponentials.