| 摘要 |
<p>. A cyclotron suitable for use in neutron therapy, and comprising a pair of opposed, spaced pole shoes having their adjacent inner surfaces defining an accelerator zone, a magnet yoke shaped to substantially enclose the accelerator zone and constitute a neutron attenuation shield for neutrons produced in the cyclotron, a target zone for a target device, a neutron beam outlet in the magnet yoke for emission of a neutron beam produced in the cyclotron, and auxiliary neutron shield means in the forward peak zone of a neutron beam produced in the cyclotron to attenuate neutron and gamma radiation in the forward peak zone to a patient tolerable level. The cyclotron has hollow accelerating dee electrodes with associated radio-frequency resonators, which are enclosed within the magnet yoke. The cyclotron may have pivot means for pivotally mounting the cyclotron to allow variation of the direction of a neutron beam during use. The disclosure further relates to a neutron therapy installation incorporating such a cyclotron.</p> |
