RADIATION DAMAGE RATES IN NUCLEAR REACTORSⅠ. The Electrical Resistance of Graphite over the Temperature Range 8-90°C: Initial Damage and Its Temperature Coefficient

摘要

The behavior of 1/8-in. spectroscopic graphite rods is shown to be variable beyond the variation of measurement. Statistical measures are given for the variability before and with irradiation. The linear regression of the reciprocal per cent change in resistance against the reciprocal exposure was determined over the range from about 25 to 90% change of electrical resistance. The linear regression of the above regression coefficients was determined for the range from 8 to 90°C. The number of specimens required to achieve a given accuracy in monitoring is calculated. Within the pre¬cision of the data, there is no evidence for departure from isothermal damaging, hence no positive evidence of radiation annealing at these temperatures and extents of damage.