医用回旋加速器束流损失率的温度调节  

Temperature Regulation for Medical Cyclotron Beam Loss Rate

作　　者：杨伟[1] 刘标[1] 丁其勇[1] 李天女[1] 孙晋[1] 徐绪党[1] 

机构地区：[1]南京医科大学第一附属医院核医学科,南京210029

出　　处：《医疗卫生装备》2014年第5期95-96,112,共3页Chinese Medical Equipment Journal

基　　金：国家自然科学基金青年基金资助项目(81202032)

摘　　要：目的：探讨医用回旋加速器粒子加速环境的温度对束流损失的影响,确定不同温度条件下加速器磁场系统工作时的最佳励磁电流,以最大限度地降低束流损失.方法：在励磁电流值恒定条件下,分别在不同的温度条件下（15～25℃）测量加速粒子自粒子源至剥离碳膜过程中的束流损失情况,计算束流损失率;根据不同加速环境的温度适度调整磁场励磁电流值,使束流损失率达到最小.结果：励磁电流值恒定时,束流在低温条件下损失率较大;在15～23℃随温度升高束流损失呈递减趋势;当温度超过23℃时,束流损失又有增大趋势.励磁电流在温度较低时适度下调、温度升高时适度上调才能达到束流损失尽量小的目的.结论：回旋加速器运行环境的温度对束流损失的影响较大,通过励磁电流校正可以有效弥补束流损失.Objective To explore the influences of medical cyclotron particle acceleration environment temperature on the beam losses,and to determine the best field excitation current value of accelerator magnetic field system under the conditions of different temperature in order to achieve minimum beam loss.Methods The beam loss of the accelerated particles between the source and carbon stripping foil was measured with constant excitation current and different temperature from 15 ℃ to 25 ℃,and then the beam loss rate was calculated.The excitation current was regulated according to different temperature to minimize the beam loss rate.Results In case of the constant excitation current,the beam loss got increased in low-temperature environment; when the temperature was limited between 15 ℃ and 23 ℃,the beam loss got decreased when the temperature rose; when the temperature was higher than 23 ℃,the beam loss also got raised.The excitation current had better be regulated against the changes of the temperature in order to minimize the beam loss.Conclusion The temperature of cyclotron running environment has a significant influence on the beam loss rate,and excitation current calibration can compensate beam loss effectively.

关 键 词：回旋加速器 束流强度 温度影响 性能测试 

分 类 号：TH774[机械工程—仪器科学与技术]