電子線の吸収線量測定についての一考察 : 平均入射エネルギーの決定法

概要

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For the purpose of calculating the absorbed dose in the water phantom, we studied a simplified procedure with which the mean energy of the electron beams at the phantom surface is determined. The mean energy is determined directly with the measured ionization half value depth in the water phantom applying the relation between the ionization half depth and the mean energy described in JARP's 1986 protocol. The procedure can be applied for both cylindrical and palallel plate ionization chambers. We calculated and evaluated the deviation of the mean energy caused by applying the simplified procedure. The value of the deviation for energy of 25 MeV or less is estimated to be or less than 2.5% applying the data described in the proceding report. The deviation of the calculated absorbed dose caused by the deviation described above is estimated to be 0.5%. The simplified procedure reported is quite simple for application for clinical purposes, and almost equivalent to JARP's one.
1991-01-01