Dosimetry system for heavy-ion radiotherapy

This paper describes a dosimetry system for the heavy-ion radiation therapy installed at HIMAC facility. Daily check of the dose monitor, a species of the accelerated particles, their energy are carried out every morning. And the dose calibration of the monitor for each patient condition are also carried out every morning. The variations of the monitor responses were less than 2% during 3 months of treatment term. In order to shorten the time for the check, a simplified dosimetric system for the dose calibration of the monitor was installed from this autumn. (author)