Radiation Shielding Val Kostroun REU Presentation, June 1, 2009

Resulting radiation field complicated Need to characterize it in order to: Design appropriate radiation shields to protect personnel and equipment Methods used to characterize field: Transport theory Monte Carlo techniques Analytic methods based on the point kernel method

Point kernel method Radiation source volume broken up into cells. Each cell contributes to the dose rate at a given point. : Flux to dose conversion factor : Path length along measured in mean free paths- : Build up factor : Un-collided flux

REU Objective Obtain point kernel expressions for dose rates due to 1) bremsstrahlung, 2) giant resonance neutrons, and 3) high energy neutrons Compare point kernel dose rate calculations with Monte-Carlo calculations* for selected ERL shielding geometries and situations: Beam collimator plus shielding wall Beam scraping shielding wall Beam loss due to sudden loss of vacuum Continuous electron loss Ratchet wall shielding Generate internal report with usable formulary and conclusions for future ERL shielding calculations. *Monte-Carlo calculations done by VK using MCNPX code