| 5 | An online monitor ionization chamber used in particle therapy显示文摘The clinical trials of tumor therapy using heavy ions beam 12C are now in progress at Institute of Modern Physics in Lanzhou. In order to achieve the precise radiotherapy with the high energy 12C beam in active pencil beam scanning mode, we have developed an ionization chamber(IC) as an online monitor for beam intensity and also a dosimeter after calibration. Through the choosing of working gas and voltage, optimizing of the electrics and the read-out system, calibrating the linearity, the detector system provide us one of the simple and highly reliable way to monitoring the beam during the active pencil beam scanning treatments. The measurement results of this detector system show that it could work well under the condition of high energy 12C beam in active pencil beam scanning mode. | TANG Bin HU Zhengguo MAO Ruishi XU Zhiguo WANG Jiansong YUE Ke TU Xiaolin WU Dapeng CHEN Jinda ZHANG Jie WANG Meng SUN Zhiyu ZHANG Xueheng LI Qiang XU Hushan XIOA Guoqing | 2009 | Nuclear Science and Techniques2009，20，3： | 0 |
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