Dose measurements of bremsstrahlung-produced neutrons from thick targets at the Advanced Photon Source.

Conference · Wed Sep 16 04:00:00 EDT 1998

OSTI ID:10875

Job, P K

Bremsstrahlung is produced in the Advanced Photon Source storage ring when the positron beam interacts with the storage-ring components or with the residual gas molecules in the storage-ring vacuum. This bremsstrahlung has an energy range of zero to 7.0 GeV, which is the maximum energy of the positron beam. Bremsstrahlung photons of sufficient high energy can interact with beamline components such as beam stops and collimators, generating neutrons of varying energies. This paper presents the results of simultaneous measurements, conducted at the Advanced Photon Source, of bremsstrahlung and the corresponding photoneutron production from thick targets of iron, copper, tungsten and lead, which allow one to correlate photoneutron dose rates from these metals as a function of bremsstrahlung power. The average photoneutron dose equivalent rates, normalized to the bremsstrahlung power, are measured as 2.7 {+-} 0.5 rem/h/W for iron, 3.2 {+-} 0.5 rem/h/W for copper, 3.9 {+-} 0.5 rem/h/W for tungsten, and 4.6 {+-} 0.8 rem/h/W for lead targets. These are measured at 80 cm lateral from the center of the targets, perpendicular to the photon beam direction.

• Research Organization: Argonne National Lab., IL (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10875
• Report Number(s): ANL/XFD/CP-96776
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED PHOTON SOURCE
BREMSSTRAHLUNG
DOSE EQUIVALENTS
DOSE RATES
NEUTRONS
PHOTON BEAMS
POSITRON BEAMS
SHIELDING
STORAGE RINGS
TARGETS