COMPARISON OF MONTE CARLO CALCULATIONS WITH MEASUREMENTS OF FAST-NEUTRON DOSE TRANSMITTED FROM A BEAM SOURCE THROUGH A SNAP-2 LiH SHIELD.

Abstract

Measurements and calculations were made of fast-neutron dose rates transmitted through a LiH SNAP shield surrounded by a collar shield of iron and oil. This was done in order to evaluate the Monte Carlo techniques used to design the experimental configurations for SNAP shielding experiments at the Tower Shielding Facility. Comparisons were made for a niimber of typical configurations and the calculated and measured fast-neutron dose rates for neutrons leaving both the LiH shield and the collar shield are in excellent agreement. This establishes the validity of this technique for analyzing future experiments.

Cost-optimized Automated Variance Reduction for Highly Angle-dependent Radiation Transport Analyses [Dissertation]

“…The method is then compared to a prior analysis by Straker [3], a hypothetical infinite medium composed of an infinite-mass isotropic scatterer, and the SNAP-2 LiH shield experiment [4]. Generally Burgart and Stevens's method performed better than those it was compared against; however, in some cases ray effects became apparent.…”

“…The resulting importance function is then used to modify the collision process and perform the corresponding weight correction. Schmidt then demonstrated the method compared to several other Monte Carlo calculations that analyze the SNAP-2 experiment [4]. In general, Schmidt's method produced a lower variance than the other Monte Carlo calculations it was compared to.…”