放医研サイクロトロンによる速中性子線の 胸部不均質組織の境界領域の線量分布

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  • Dose Distributions in Boundary Region of Thorax Inhomogeneity for Fast Neutron Beam from NIRS Cyclotron

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説明

The validity was examined in applying the power law tissue-air ratio (TAR) and the isodose shift methods to the dose calculation in thorax tissue inhomogenity containing the boundary region for fast neutron beam. The neutron beam is produced by bombarding a thick beryllium target with 30 MeV deuterons. Lung phantom was made of granulated tissue equivalent plastic, which resulted in density of 0.30g/cm3. Depth dose distributions for neutron beam were measured in thorax phantom by an air-filled cylindrical ionization chamber with TE plastic wall. The power law TAR method considering TAR of zero depth at the boundary was compared with the measured data and a good result was obtained that the calculated dose was within ±3 % against the measured.

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