1991•Japanese Journal of Radiological TechnologyOpen access
A STUDY OF DOSIMETRY WITH ELECTRON BEAMS : IONIZATION TO ABSORBED DOSE CONVERSION FACTORS WITH CYLINDRICAL IONIZATION CHAMBERS
Kozo Kumagai, Kenji Ishimatsu, TATSUYA OHTSUKA, Fujio Araki, Takumi Iseri, TSUTOMU KAWANO, Hiromi Nishimoto, YOICHI MONJI, KAZUHIRO KOSAKI, KEIKO MANO, KATSUMI KAWAKAMI, MIKARI YOSHIMOTO
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Abstract
We calculated ionization to absorbed dose conversion factors for electron beams with the procedure described in the JARP's 1986 protocol. The calculation deals with 8 types of commercially available cylindrical ionization chambers. We studied a simplified procedure with which the conversion factor of any of the ionization chambers can be substituted for that of the JARP's ionization chamber and presumed the uncertainty of the tumor dose led with the simplified procedure. The exactly calculated conversion factors of the ionization chamber agree with those of the JARP's ionization chamber between +0.5% and -1.7%. The uncertainty of the conversion factors calculated with the simplified procedure is estimated to be 2.8%, if the JARP's procedure lead the uncertainty to 2.3%. Then, the uncertainty of the tumor dose led with the simplified procedure arises from the uncertainty to 5.2%. Therefore, the simplified procedure has an almost equivalent tumor dose accuracy when compared with the JARP's one.
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