モンテカルロ法による遮蔽問題の解析

抄録

The Monte Carlo method is a very useful tool for solving a large class of radiation transport problem. In contrast with deterministic method, geometric complexity is a much less significant problem for Monte Carlo calculations. In addition to the benefit, the processing of electronic computer is getting speedy day by day. Under these circumstances, the Monte Carlo method is recognized as a fundamental and practical method for radiation shielding analysis.
A fundamental form of the Boltzmann transport equation for the Monte Carlo analysis, the concept of importance sampling and the effectiveness of biasing are described in the first half of this report. Practical calculation techniques for deep penetration problems, radiation streaming problems and secondary γ-ray penetration problems are represented in detail in the latter half. The importance sampling, the iterative forward-adjoint Monte Carlo method and the Monte Carlo-Monte Carlo coupling technique have been proposed as effective methods for the variance reduction and the computation time reduction.