1. Radiation Shielding Val Kostroun REU Presentation, June 1, 2009

3. 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

4. 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

5. 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