This was the fourth in a series of experiments performed on a variety of opto-electronic circuit elements using the University of Washington Van de Graaff accelerator. This experimental program is intended to permit simulations of the performance of different optical circuit designs in radiation environments such as those encountered in spacecraft applications and in nuclear reactors. The irradiated components can be assembled in our lab at Ball Aerospace to simulate a variety of different circuit designs and the effect of different dose levels on the individual components can be analyzed.