@article{oai:repo.qst.go.jp:00057360,
 author = {Fujisaki, Tatsuya and Hiraoka, Takeshi and Abe, Shinji and Saitoh, Hidetoshi and 平岡 武 and 阿部 慎司},
 issue = {2},
 journal = {Medical Standard Dose},
 month = {Oct},
 note = {Plane-parallel ionization chambers exhibit polarity effects with low energy electron beams in therapeutic electron dosimetry.  In this report, the polarity correction factors for ten commercially available plane-parallel ionization chambers were investigated as a function of mean energy.  The factors was measured at phantom surface for ten chambers and depths along depth-dose curves for five chambers of nominal 4, 6, 9, 12 and 15 MeV electron beams.  The polarity correction factors for all chambers as phantom surface were 0.5% or less in mean electron energy range of 3.5 to 14.7 MeV.  The factors for five chambers in water were also shown to increase substantially with mean energy of about 3 MeV or less.},
 pages = {51--55},
 title = {Polarity effects of commercially plane-parallel ionization chambers in therapeutic electron dosimetry},
 volume = {12},
 year = {2007}
}