5-13 A Design of Current to Frequency Converter for Dose Monitoring in Heavy Ion Therapy

• 作者: She Qianshun Su Hong Wang Yanan
• 来源期刊: 中国科学院近代物理研究所和兰州重离子研究装置年报：英文版
• 学科: 物理学
• 年，卷（期）: 2016,（1）
• 页码范围: 220-221
• 页数: 2页
• 分类号: O4

摘要

In order to make sure that the tumor is irradiated by a uniform and adequate dose and the surrounding tissues are damaged as little as possible,we need to monitor and measure the irradiation dose in real time.The dose monitoring probe of the beam intensity monitoring system in the deep-seated tumor therapy is an integral ionization chamber,its’output current signal is proportional to the beam intensity.The output signal of the ionization chamber is less than 1 A.In order to measure the weak current signal,a new current to frequency converter has been developed.