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本工作建立1套电离室绝对剂量测量系统,对自制石墨电离室性能进行研究,实验结果表明自制电离室系统满足标准电离室的要求。设计了1套基于同向测量的透射电离室,用于在线监测束流变化,为剂量测量的准确性提供了依据,解决了替代法校准时束流波动对测量结果造成较大不确定度的问题。对已建立的电离室测量低能质子吸收剂量绝对测量系统进行不确定度评估,合成标准不确定度约4%。最后,以自行研制的质子剂量测量系统(电离室系统、透射电离室系统)在HI-13串列加速器上开展了对丙氨酸剂量计校准技术的研究,获得了不同能量质子辐照下的RE值。
In this work, a set of absolute dose measurement system of ionization chamber was established to study the performance of self-made graphite ionization chamber. The experimental results show that the homemade ionization chamber system meets the requirements of standard ionization chamber. A set of transmission ionization chambers based on the same measurement was designed to monitor the beam changes online to provide a basis for the accuracy of dose measurement and to solve the problem of large uncertainty caused by beam fluctuations during the calibration of alternative methods problem. The uncertainty of the absolute measurement system of ionospheric ionization chamber measuring low energy proton absorbed dose was evaluated, and the standard uncertainty of synthesis was about 4%. Finally, a calibration technique of alanine dosimeter was developed on a HI-13 tandem accelerator with a self-developed proton dosimetry system (ionization chamber system and transmission ionization chamber system). The effects of different energy proton irradiation RE value.