Radiation fields at the GIF are produced by high-intensity gamma-ray sources. The sources used at the GIF are cobalt-60 pins. The facility offers gamma dose rates from 10-3 rad/s to over 103 rad/s. The GIF can house a wide variety of gamma irradiation experiments with various test configurations and at different dose and dose rate levels. The in-air irradiations are conducted using three concrete test cells: two cells are 3 m × 3 m; one cell is 5.5 m × 9.1 m. Various objects are tested for their abilities to withstand the damaging radiation environments they might experience in space, near stored nuclear materials, or when they experience extreme radiation environments.