| 摘要 |
A source container for a radiation source comprises a vessel having an external wall (12, fig. 5) defining a space within which is located a shield 18 formed from a radiation absorbing material and defining a cavity for receiving a radiation source 30, said shield including a window 24 extending from said cavity through said radiation absorbing material, and at least two shutters 20, 22, each shutter being movable between a closed position in which said shutter covers said window and an open position in which said shutter does not cover said window. The provision of two or more shutters provides a means to emit radiation of different intensities from the same source and container. |
