Additional measurements of the radiation environment at the Los Alamos Spallation Radiation Effects Facility at LAMPF

Conference · Wed Jan 01 00:00:00 EST 1986

DOI:https://doi.org/10.1520/STP25688S· OSTI ID:5934848

Davidson, D R; Reedy, R C; Greenwood, L R; Sommer, W F; Wechsler, M S

Foil activation dosimetry experiments were conducted in a ''rabbit'' system at the completed Los Alamos Spallation Radiation Effects Facility (LASREF). The ''raffit'' system contains four tubes spaced radially outward 0.12, 0.18, 0.27, and 0.38 meters off beam centerline. Foils were irradiated for 3 to 62 hours to measure the neutron flux and energy spectrum radially from beam centerline, along the beamline, and the effect of the Isotope Production (IP) target loadings on the neutron flux in the neutron irradiation locations. Irradiations showed a decrease in the radial flux by a factor of 6 in 0.15 meters of iron outside the IP targets. An enchancement was seen in the 24-keV energy region outside 0.15 meters. There was little difference in the shape of the spectra outside the IP targets and the beam stop with the exception of the high energy tail (energies above 20 MeV). The decrease in the high energy tail outside the beam stop is due to the degradation of the energy of the proton beam in the IP targets. Irradiations outside the beam stop with zero and eight IP targets gave the same spectral shape with the exception of the high energy tail. The magnitude of the integral flux decreased by a factor of 2 when eight IP targets were present. Irradiations with five ''rabbits'' stacked on top of each other showed no difference in the integral flux below, on and above beam centerline.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Iowa State Univ., Ames, IA (United States)
• DOE Contract Number: W-31-109-ENG-38; W-7405-ENG-36
• OSTI ID: 5934848
• Report Number(s): LA-UR-86-934; CONF-860605-12; ON: DE86008736
• Resource Relation: Conference: 13. international symposium on the effects of radiation on materials, Seattle, WA, USA, 23 Jun 1986
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
LAMPF II SYNCHROTRON
NEUTRON FLUX
NEUTRON SOURCES
ACTIVATION DETECTORS
FOILS
ISOTOPE PRODUCTION
PROTONS
ACCELERATORS
BARYONS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
MEASURING INSTRUMENTS
MESON FACTORIES
NEUTRON DETECTORS
NUCLEONS
PARTICLE SOURCES
RADIATION DETECTORS
RADIATION FLUX
RADIATION SOURCES
SYNCHROTRONS
430303* - Particle Accelerators- Experimental Facilities & Equipment