電子線の吸収線量測定についての一考察 : 吸収線量測定の簡便法

概要

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JARP announced officially the protocol for absorbed dose measurement at 1986. We presented a modified procedure that includes two items simplified for easy calculation in the protocol. In the first item, the ionization to absorbed dose conversion factors for electron irradiation with the JARP's ionization chamber are applied for all cases in which any other commercially available cylindrical chambers are used. In the second one, the electron mean energy at the phantom surface is determined directly with the ionization half-depth in the water phantom. The amount of calculation to be done is greatly decreased compared with that of the JARP's protocol. Results with the simplified procedure agreed well with those of JARP's. We applied the simplified procedure to an exercise in JARP's protocol. As a result, the simplified procedure corresponded to JARP's protocol in the range of ±1 at the last digit of the values for percentage depth dose. The mean energy determined in 16.7 MeV shown in the exercise. The Bremusstralung background has been neglected in JARP's exercise for the mean energy determination. The resultant error in the mean energy caused by the disregard of the bremusstralung background has come about twice that arising from the simplified procedure.
1991-04-01