An example Attila/MCNP dose rate calculation is shown on the left. A 1000 Ci Cs-137 pinhole irradiator was placed in a room with a maze entrance. SpaceClaim was used to model the entire space, freeing our analysts from solid modeling via antiquated combinatorial geometry. The SpaceClaim model was imported into Attila and meshed in a manner similar to Finite Element Analysis (FEA) for mechanical engineering.
The forward solver in Attila was executed to generate variance reduction data, and MCNP was executed to calculate the dose rate at each mesh point. Visual clues suggest that dose rates by the entry door could be reduced by thickening a portion of the maze wall near the door, providing a cost-effective solution.
Stratify//MHChew's radiation shielding group has a wealth of experience in radiation transport modeling and criticality safety. We employ certified health physicists, physicists, chemists, mathematicians, and disciplined engineers. Some of our staff maintain active US Department of Energy (DOE) “Q” clearances. We are proven radiological consultants working at DOE national laboratories, nuclear power stations, Fukushima, and CERCLA environmental cleanup projects.