CHANGES IN THE THERMAL AND ELECTRICAL PROPERTIES OF IRRADIATED GRAPHITE DURING PULSE-ANNEALING

Technical Report · Thu Jan 24 04:00:00 EST 1952

OSTI ID:4330624

Hook, A S

An apparatus for the simultaneous experimental determination of the changes occurring in the thermal resistivity, the electrical resistivity, and the thermoelectric power of irradiated graphite as a function of pulse-annealing is described. Small specimens of irradiated graphite are heated in vacuum in a series of temperature pulses of 1-minduration. Each succeeding pulse is to a temperature higher than its predecessor. Increments of pulsing temperature are usually 50 deg C, and the annealing usually terminates at 2200 deg C. The physical properties are determined after each pulse with the specimen at a standard equilibrium temperature. Results of the pulse-annealing of a number of specimens of varied Hanford reactor exposure histories are given. These constitute a survey to show the effects which elevated specimen temperatures during exposure have upon the nature and magnltude of radiation damage accumulated in the above named properties as compared with reactor exposure at 30 deg C. Elevated temperatures of exposure are shown generally to result in marked decreases in accumulated radiation damage. (auth)

• Research Organization: North American Avaition, Inc., Downey, Calif.
• DOE Contract Number: AT(11-1)-GEN-8
• NSA Number: NSA-12-000736
• OSTI ID: 4330624
• Report Number(s): NAA-SR-119(Del.)
• Country of Publication: United States
• Language: English

Related Subjects

CHEMISTRY
GRAPHITE
HEATING
IRRADIATION
PULSES
RADIATION INJURIES
REACTORS
TEMPERATURE
THERMAL UTILIZATION
THERMODYNAMICS
VACUUM