V.高エネルギー放射線治療装置の選定と保守管理について(高エネルギー照射装置による治療計画のあり方)(第1回放射線技術)

抄録

The most important megavoltage units are now the linear accelerator, the batatron, and the telecobalt units. The proper maintenance and control of these equipments are essential. In an attempt to know maintenance troubles and dosimetry problem etc, questionnaires were sent to 78 institutions or hospitals in which magavoltage equipments are installed, some 55 (70.5%) of the questionnaires were returned. The findings are indicated that the linearaccelerator and the betatron had machine troubles as twice as that of cobalt units and the dosimetry (out put check) were done only once a month in many institutions. According to our recent data in five years, the main time between failure (MTBF) was 104 hrs in the linear accelerator and stablity of out put dose was not enough. It may change around 4% in a week. The cost for 100 rad was culculated which shows about 1,100 yen for betatron and about 800 yen for linear accelerator and telecobalt unit.