机房温度对医用回旋加速器束流损失率的影响  

Influence of room temperature on the loss rate of medical cyclotron beam

作　　者：徐绪党[1] 杨伟[1] 丁其勇[1] 李天女[1] 孙晋[1] 刘标[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：《现代仪器与医疗》2013年第5期5-7,共3页Modern Instruments & Medical Treatment

基　　金：国家自然科学基金青年基金资助项目(No:81202032)

摘　　要：目的探讨医用回旋加速器粒子加速环境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,实现最大程度降低束流损失。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,使束流损失率最小。结果励磁电流值恒定时,束流在低温条件下束流损失率较大,在15-23℃温度范围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;在温度相对较低时励磁电流需适度下调、温度升高时适度上调才能实现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 influence of the environment temperature on the beam losses of the medical cyclotron particle acceleration;To determine the best field excitation current value of the accelerator magnetic field system under the conditions of different temperature;achieve maximum reduce the beam loss.Method Under the condition of constant excitation current value,measure the beam damage of the accelerated particles flying from the source to the stripping carbon film under the condition of different temperature（15℃-25℃）,calculate the beam loss rate;According to the different acceleration environment temperature,adjust the magnetic field excitation current value to minimize the beam loss rate.Results The beam loss rate is greater under the condition of low temperature at the constant excitation current value;the beam loss showed the trend of decreasing within the temperature range of 15℃ to 23℃;the beam loss showed the increasing trend when the temperature more than 23℃.the field current shall be modestly lower at relatively low temperature,and should be modestly higher at higher temperature to achieve low beam losses as far as possible.Conclusion The temperature of the cyclotron running environment has a significant influence on the beam loss rate;Through the field current calibration can compensate the 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：R811.1[医药卫生—放射医学] TH774[医药卫生—临床医学]