リニアック室迷路散乱X線の鉛遮蔽材に対する空気カーマ透過率

概要

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Spectra of scattered X-rays in the maze of a Linac (X-ray energies of 4, 6, and 10 MV)room were estimated by means of the Monte Carlo simulation, and air kerma transmission factors of the X-rays scat-tered through a lead shield were evaluated based on those spectra. Spectra of scattered X-rays showed a maximum in the energy area below 200 keV. The higher the accelerated electron energy, also, the smaller the scattering angle that tended to spread to the higher energy area of the distribution of spectra. The air kerma transmission factor of 120° scattered X-rays of 4 MV X-rays obtained in this study was larger than the transmission factors of 124° scattered photons of ^<60>Co gamma rays through a lead shield given in ICRP. The air kerma transmission factors of 120° scattered X-rays of 6 MV X-rays were smaller than the transmission factors of 90° scattered photons of ^<60>Co gamma rays. The air kerma transmission factors of 120° scattered X-rays of 10 MV X-rays was slightly larger than transmission factors of 90° scattered photons of ^<60>Co gamma rays. Therefore, in the case of a 4 MV X-ray Linac room, the calculation method given in the "Manual of Practical Shield Calculation of Radiation Facilities (2000)" causes underestimation of leakage doses.
2005-01-20