GAS BREMSSTRAHLUNG AND ASSOCIATED PHOTON-NEUTRON SHIELDING CALCULATIONS FOR ELECTRON STORAGE-RINGS

The EGS4 electron-photon Monte Carlo code has been used to study the c haracteristics of the bremsstrahlung X rays generated from the interac tion of circulating electrons with the residual gas in accelerator sto rage rings. Gas bremsstrahlung dose rates are given for various openin g angles as a function of the electron beam energy ranging from 0.5-10 GeV. Photon and neutron dose rates, generated from various devices st ruck by gas bremsstrahlung in a synchrotron radiation beamline, are al so presented along with the photon spectral and transmission results. The EGS4-predicted results are found to be in basic agreement with the measurements made at the Stanford Synchrotron Radiation Laboratory. F igures, equations, and a simple method useful for the photon-neutron s hielding design for beamlines are provided.