Abstract
We have irradiated several Allen Bradley carbon resistors (type BB, 1/8 W) at 4.6 K in a reactor up to a dose of 3 × 10 9 r gammas and 2.5 and 2.0 × 10 18 cm −2 thermal and fast neutrons respectively. A significant change of the R(T) characteristics is observed after irradiation and after subsequent annealing. For accurate temperature measurements allowance must be made for sufficient radioactivity decay time. A calibration procedure which is particularly suitable for high precision thermopower experiments is also reported.
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