回旋加速器束测探头感生放射性实验研究

基于束流沉积法测量回旋加速器内部束流参数将在束测探头上产生感生放射性污染，从而对加速器调束工作人员带来不必要的辐射危害。采用AGM-6型监测仪对探头感生放射性进行在线测量，通过测量不同半径处探头受辐射后的空气比释动能率，间接反映探头感生放射性的强弱和危害。研究结果表明，在束流调试实验中，应尽量降低馈入高频的占空比；探头测量后冷却2~3 h取出，则不需要考虑测量探头辐照后的残留感生放射性的危害。

Experimental investigation on induced radioactivity in beam probe for compact cyclotron

When the conventional beam deposition method is applied to the internal beam parameters measurement in cyclotron, the induced radioactive contamination generated in the measuring probe will lead to unnecessary radiation hazards to the accelerator beam tuning staff. The AGM-6 gamma monitor was applied to on-line measurement of the induced radioactivity. By measuring the air kerma rate of the probe irradiated at different radii, the strength and the hazards of induced radioactivity were reflected indirectly. The results show that the high-frequency duty cycle should be reduced, and the probe should be cooled for 2-3 h before being removed in the beam tuning experiment. Otherwise, one should consider hazards of the residual induced radioactivity after the measuring probe being irradiated.