10,000 CURIE COBALT-60 IRRADIATION CAVE AT JAPAN ATOMIC ENERGY RESEARCH INSTITUTE

An irradiation cave with a 10-kilocurie Co/sup 60/ source for testing non-metallic materials used in reactors and for studies in radiation chemistry has been built at the Japan Atomic Energy Research Institute. The cave consists of three high-density concrete in-line cells with a wall thickness of one meter. The source consists of 110 Co/sup 60/ rods from MTR. The dose rate at the center of the axis of the source cylinder can be varied in three steps, and its maximum value is approximately 2 x 10/sup 6/ r/hr. (W.D.M.)