Abstract
A radiation induced electromotive force (RIEMF) was measured in mineral insulated cables (MI-cables) under fission reactor irradiation. A negative electromotive force of about 10 V was generated in the center lead by the reactor irradiation. The RIEMF increased with increasing irradiation dose with about − 14 V measured under the reactor full power irradiation at 573 K with a total dose of 1.1 × 10 10 Gy ionizing irradiation and 1.1 × 10 24 n/m 2 fast neutron irradiation. The measured voltage of the RIEMF was found to depend linearly on the reciprocal temperature. The observed RIEMF was a so-called current driven source and the measured current was linearly dependent on the reactor power and was about 50 nA for the 0.7 m long MI-cables at 573 K. Under full power, irradiation conditions were 6 W/g of a gamma flux (6 × 10 3 Gy/s ionizing dose rate) for iron and 5 × 10 17 n/m 2 and 1.1 × 10 18 n/m 2 fast and thermal neutron fluxes, respectively.
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