Annealing of neutron damage in graphite irradiated and stored at room temperature.
Annealing of neutron radiation damage in graphite at the same temperature at which it was irradiated is reported. Highly oriented pyrolytic graphite samples were irradiated to fluences in the range 0.44 to 153 x 10/sup 15//cm/sup 2/ at room temperature using three different neutron sources with average energies of 1.5, 5.5, and 15 MeV, respectively. Following these irradiations, the C/sub 44/ elastic constants of the samples were measured several times over periods up to two years during which time sample temperatures never exceeded 30/sup 0/C. The C/sub 44/ constants were observed to slowly decrease toward their unirradiated values with up to 40% of the irradiation-induced changes eventually annealing out.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, WA (USA); Pennsylvania State Univ., University Park (USA)
- DOE Contract Number:
- EY-76-C-06-1830
- OSTI ID:
- 6317409
- Report Number(s):
- PNL-2676
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360605 -- Materials-- Radiation Effects
ANNEALING
CARBON
ELEMENTS
ENERGY RANGE
GRAPHITE
HEAT TREATMENTS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON SOURCES
NONMETALS
PARTICLE SOURCES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION SOURCES
SHEAR PROPERTIES
STORAGE
TIME DEPENDENCE
360601* -- Other Materials-- Preparation & Manufacture
360605 -- Materials-- Radiation Effects
ANNEALING
CARBON
ELEMENTS
ENERGY RANGE
GRAPHITE
HEAT TREATMENTS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON SOURCES
NONMETALS
PARTICLE SOURCES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION SOURCES
SHEAR PROPERTIES
STORAGE
TIME DEPENDENCE