X線診断領域におけるDirect Ion Storage線量計の性能評価

概要

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Radiation protection for the physician is very important in interventional radiology (IVR), as some have been injured performing IVR. The radiation dose to the physician should be monitored in real-time, but unfortunately this is not possible with most radiation monitors. The Direct Ion Storage (DIS) dosimeter, a structure that combines a microminiature ionization chamber with a field effect transistor (FET), is a small dosimeter that is based on a new principle. A DIS dosimeter enables real-time measurements. We carried out a fundamental evaluation of whether a DIS dosimeter is suitable as a personal dosimeter in IVR using diagnostic X-ray apparatus. In this study, DIS measurements of 1-cm and 70-μm dose equivalents were evaluated. We investigated the performance (angle dependence, linearity, reproducibility, and stability) of the DIS. The sensitivity of the angle dependence of the DIS exceeded 80% over a range of ±60°. The DIS had good reproducibility and stability. Furthermore, it had good linearity, and was able to make measurements at a high dose rate. Therefore, the DIS dosimeter performs sufficiently well at diagnostic X-ray energies to use for monitoring radiation exposure in real time during IVR.原著Original Paper
東北大学の論文