Basic aspects of spallation radiation damage to materials

Conference · Sun Oct 01 04:00:00 EDT 1995

DOI:https://doi.org/10.1063/1.49063· OSTI ID:106902

Wechsler, M S; Lin, C ^[1]; Sommer, W F ^[2]

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1. North Carolina State Univ., Raleigh, NC (United States)
2. Los Alamos National Laboratory, NM (United States)

The nature of radiation effects, as learned from investigations using reactor neutron irradiations, is reviewed, and its relevance to spallation radiation damage to materials in accelerator-driven neutron sources is discussed. Property changes upon irradiation are due to (1) displaced atoms, producing vacancy and interstitial defect clusters, which cause radiation hardening and embrittlement; (2) helium production, the helium then forming bubbles, which engenders high-temperature grain-boundary fracture; and (3) transmutations, which means that impurity concentrations are introduced. Methods for analyzing displacement production are related, and recent calculations of displacement cross sections using SPECTER and LAHET are described, with special reference to tungsten, a major candidate for a target material in accelerator-driven neutron systems.

• Research Organization: Los Alamos National Lab., NM (United States)
• OSTI ID: 106902
• Report Number(s): LA-UR--95-1792; CONF-9407103--; ON: DE95014018
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ATOMIC DISPLACEMENTS
HELIUM EMBRITTLEMENT
ION BEAM TARGETS
L CODES
NEUTRON SOURCES
PHYSICAL RADIATION EFFECTS
S CODES
SPALLATION