Secondary bremsstrahlung dose rates from glancing incidence target

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1146924· OSTI ID:389636

Job, P; Haeffner, D ^[1]

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1. Experimental Facilities Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)

Several collaborative access teams at the Advanced Photon Source (APS) are planning to use a vertically or horizontally reflecting mirror as the first optical element in the insertion device beamlines. The scattering of the bremsstrahlung from the glancing incidence mirrors is significantly different than that from normal incidence targets. The Electron Gamma Shower program (EGS4) was used to calculate the angular distribution of the scattered secondary bremsstrahlung from copper and silicon glancing incidence mirrors. These calculations were done for an incident angle of 0.15{degree}. Pair production, positron annihilation at rest and in flight, Moliere multiple scattering, Moller and Bhabha scattering, delta ray production, Compton scattering, the photoelectric effect, and the continuous energy loss by Bethe-Bloch formalism were the processes simulated in this calculation. The dose at one meter away from the mirror, due to the scattered secondary bremsstrahlung, was calculated from the energy deposited in the standard ICRU tissue placed at that location. Since the EGS4 result is expressed as the dose per photon, the dose rate was obtained by multiplying the dose per photon by the total number of photons produced in unit time in the insertion device vacuum chamber. The dose rate results and its implication for the design of the first optical enclosures are presented in this paper. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 389636
• Report Number(s): CONF-9510119--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 67; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ADVANCED PHOTON SOURCE
ANGULAR DISTRIBUTION
ANL
BREMSSTRAHLUNG
DOSE RATES
INCIDENCE ANGLE
MIRRORS
OPTICAL SYSTEMS
PHANTOMS
SAFETY ENGINEERING
SCATTERING
SECONDARY EMISSION
SYNCHROTRON RADIATION
X-RAY DOSIMETRY