患者被曝線量計として開発した小型電極電離箱の特性評価

概要

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In our first report, the trial products and its properities of "the Double-Electrode Ionization Chember" was introduced. This chamber enables measurement of "exposure dose" and "area exposure product" by attaching this chamber to the surface of the collimator. Due to the use of a 15μm thick aluminum layer for electrode material, it resulted in a completely lightopaque, incapable of using collimative light as a field indicator. After various examinations of materials for the electrode, we succeeded in developing two types of chambers ; one, a minute aluminum electrode (minimized electrode ionization chamber) ; the other, a transparent electrode consisting of Indium-Tin oxide on film (transparent electrode ionization chamber). We also developed an amplifier for these purposes. In this paper, an outline and properties (dose quality and quantity, dose rate, field-output relationship, aluminum-equivalent thickness and light transparency rate) are being reported. Performances of these chambers agree well with the IONEX chamber (0.3cm^3 type 2536) used as a reference. These chambers can be used to measure patient doses without hindering the light indication of a collimator.
公益社団法人日本放射線技術学会の論文
1996-05-20