DS86 neutron dose: Monte Carlo analysis for depth profile of 152Eu activity in a large stone sample.

The depth profile of 152Eu activity induced in a large granite stone pillar by Hiroshima atomic bomb neutrons was calculated by a Monte Carlo N-Particle Transport Code (MCNP). The pillar was on the Motoyasu Bridge, located at a distance of 132m (WSW) from the hypocenter. It was a square column with a horizontal sectional size of 82.5cm ∞ 82.5cm and height of 179cm. Twenty-one cells from the north ...