Self-shielding and edge corrections were investigated for varying thicknesses of 1 cm dia. gold foils. Test foils were irradiated in the hohlraum or air chamber of the Cornell University TRIGA Mark II reactor. The self-shielding effect was determined from the activation of a series of foils of different thicknesses and the edge correction from the activities of successively smaller concentric rings punched from the parent foil. Edge effects were found in the 2.5 mil and thicker foils and were statistically significant only in the outer millimeter of the foil radius. After cutting off the outer millimeter of the foils, the activity was found to follow the ½ − E3(t∑a) law for infinite foils.