Measurement and analysis of gamma-ray dose distribution in actual ship.

概要

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Gamma-ray dose distribution was measured in an actual ship to study applicability of point kernel method popularly applied to the calculation of γ-ray dose distribution in ships which have usually compartmentalized structures. Measured distribution was used to verify applicability of Monte Carlo method to the analysis of γ-ray dose distribution in the ship. Monte Carlo method was proved to be effective for analysis of γ-ray dose distribution in the ship.<BR>Monte Carlo analysis revealed that γrays scattered back from steel plates constructing ship hull increase their contribution to measured dose value as the distance between the dose measuring point and γ-ray sources increases. This contribution has not been taken into account in dose distribution calculations for ships by the point kernel method with the usual buildup factor.<BR>Present study also disclosed that feasibility of applying Monte Carlo method to the analysis of γ-ray dose distribution in ships will be enhanced remarkably by utilizing the function adopted in the subroutine RELCOL in the Monte Carlo code MORSE-CG and by applying the source direction biasing technique to save machine time and to improve stat-istics of the calculated results.
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