PROBLEM TO BE SOLVED: To solve disadvantages that which part and what quantity a subject receives an exposure cannot be decided in accordance with a quantity of exposure of X-ray measured by a dosimeter of a front surface of a collimator, and since the size of the dosimeter directly attached to the subject is limited, all areas exposed to an X-ray cannot be measured and the dosimeter itself or a cable as its accessories is taken in an X-ray fluoroscopically recorded image.SOLUTION: A mat type dosimeter 12 having a compact plastic scintillator dosimeter embedded in a matrix shape which is laid under the subject 9 is arranged immediately before an X-ray incident side of the subject 9 to measure the quantity of exposure of X-ray of the subject 9.COPYRIGHT: (C)2012,JPO&INPIT【課題】コリメータの前面の線量計で測定したX線被曝量は被検者がどの部位にどれだけ被曝しているかは判断できない。また、被検者に直接貼り付ける線量計はその大きさに限度があるため、すべてのX線被曝領域を測定できず、また線量計自身やその付属品であるケーブルがX線透視/撮影像に写りこんでしまうという欠点があった。【解決手段】被検者9の下に敷く、マトリックス状に小型のプラスチックシンチレータ線量計を埋め込んだ敷物形線量計12を被検者9のX線入射側の直前に配設して被検者9のX線被曝量を測定する。【選択図】 図1
