The need to update NCRP 151 data for 10 MV linear accelerator bunker shielding based on new measurements and Monte Carlo simulations
This study examines a cohort of clinical linac bunker survey measurements and compares them
to popular shielding protocols. Differences were investigated using contemporary beam data for both
Monte Carlo simulation and in analytical equations. For primary barriers, NCRP 151 underestimates
the dose rate through concrete by on average a factor of 2 with secondary barriers and maze entrance
doses having much better agreement. Use of contemporary beam data in Monte Carlo simulation and an
analytical equation yielded TVL values much closer to the measured values compared to NCRP 151. The
TVL data...
Source: Journal of Radiological Protection - Category: Physics Authors: J Rijken, S Towns and B Healy Source Type: research