潜影形成的Mitchell浓集理论是在1957年至1958年间首次提出的,距今刚好三十年。Mitchell理论与Gurney-Mott和Hamilton理论的主要差别在于潜影生长时所发生的事件顺序不同。在Gurney-Mott理论中,导带电子是由随机的扩散移动过程扩散到陷阱位置,然后陷阱电子再把一个填隙银离子(Ag_0~+)吸引到电子所在的位置, The Mitchell concentration theory of latent images was first proposed from 1957 to 1958, just over thirty years ago. The main difference between Mitchell’s theory and Gurney-Mott and Hamilton’s theory is the sequence of events that occur when a latent image grows. In the Gurney-Mott theory, the conduction band electrons diffuse to the trap site by a random diffusion process, and then the trapping electron attracts a interstitial silver ion (Ag_0 ~ +) to the electron.