Energy released at high temperature by irradiated graphite

✍ Scribed by J Rappeneau; J.L Taupin; J Grehier

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 895 KB
• Volume: 4
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(66)90016-9

✦ Synopsis

The energy H stored by graphite under the effect of neutron radiation can be released by thermal annealing. It is possible to determine by differential thermal analysis the differential enthalpy dH/dO (cal/g/'C) as a function of the annealing temperature 8. Integration of the spectrum obtained gives the overall quantity of energv H(8). To determine the form of the energy spectrum at high temperature, a differential thermal analysis apparatus operating up to 1800°C was built. The tests were carried out under vacuum in a graphite resistance furnace and the temperature was measured as a function of time by means of WRe&WRep8% and graphite/boronated graphite thermocouples. The description of the apparatus is followed by an examination of graphites irradiated in the reactors BR.2 (C.E.N. Belgium) and H.F.R. (Petten, Holland) at doses between 1000 and 4000 MWJ/T and at temperatures between 70°C and 250°C. The energy spectra obtained show, for all the samples studied, the presence of a healing peak at temperatures of the order of 1200 to 15OO'C. This peak was also found in the case of thermal healing of other physical properties of irradiated graphites.