Assessment of radiation exposure for materials in the LANSCE Spallation Irradiation Facility

Conference · Mon Jan 01 04:00:00 EST 2001

OSTI ID:975111

James, M R ^[1]; Maloy, S A ^[2]; Fowler, Malcolm M; Dry, D E ^[3]; Ferguson, P D ^[4]; Corzine, R K ^[5]; Mueller, G E ^[6]

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1. Michael R.
2. Stuart A.
3. Donald E.
4. Phillip D.
5. R. Karen
6. Gary E.

Materials samples were irradiated in the Los Alamos Radiation Effects Facility (LASREF) at the Los Alamos Neutron Science Center (LANSCE) to provide data for the Accelerator Production of Tritium (APT) project on the changes in mechanical and physical properties of materials in a spallation target environment. The targets were configured to expose samples to a variety of radiation environments including high-energy protons, mixed protons and neutrons, and predominantly neutrons. The irradiation was driven by an 800 MeV 1 mA proton beam with a circular Gaussian shape of approximately 2{sigma} = 3.5 cm. Two irradiation campaigns were conducted in which samples were exposed for approximately six months and two months, respectively. At the end of this period, the samples were extracted and tested. Activation foils that had been placed in proximity to the materials samples were used to quantify the fluences in various locations. The STAYSL2 code was used to estimate the fluences by combining the activation foil data with calculated data from the LAHET Code System (LCS) and MCNPX. The exposure for each sample was determined from the estimated fluences using interpolation based on a mathematical fitting to the fluence results. The final results included displacement damage (dpa) and gas (H, He) production for each sample from the irradiation. Based on the activation foil analysis, samples from several locations in both irradiation campaigns were characterized. The radiation damage to each sample was highly dependent upon location and varied from 0.023 to 13 dpa and was accompanied by high levels of H and He production.

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 975111
• Report Number(s): LA-UR-01-0343; LA-UR-01-343
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
INTERPOLATION
IRRADIATION
LOS ALAMOS
NEUTRONS
PHYSICAL PROPERTIES
PRODUCTION
PROTON BEAMS
PROTONS
RADIATION EFFECTS
RADIATIONS
SHAPE
SPALLATION
TARGETS
TRITIUM