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Postirradiation tests on specimens irradiated at 4.9/sup 0/K to a dose of 2 x 10/sup 8/ rads showed no significant changes. The details of the materials involved, specimen preparation, testing procedures, and the in-situ results of electrical-resistiity measurements were given previously. A similar experiment, but for a ten-times-greater dose (2 x 10/sup 9/ rads) at the same irradiation temperature, was performed during fiscal year 1978. Improved specimen-preparation and testing techniques were used, and some significant changes in physical properties were observed. These changes tend to restrict the use of some of these materials. Radiation-induced gaseous-breakdown products were analyzed and found to contain principally H/sub 2/ but also other inorganic and organic compounds.

Radiation effects on organic insulators for superconducting magnets. Annual progress report for period ending September 30, 1978