| 摘要 |
The invention relates to a container for a radioactive source, having reduced radiation leakage from a gap between movable housing components. The container comprises a housing having a bore extending into the housing. A removable cylindrical sleeve having a chamber therein is inserted into the bore. Two co-operating helices are present; the first helix is located on a surface of the housing facing into the bore, and the second helix is located on the sleeve. The co-operating helices block the gap between the housing and the sleeve when the sleeve is inserted into the bore, thereby attenuating the radiation emanating from the gap when a radioactive source is housed within the container. Axial rotation of the sleeve within the bore results in movement of the sleeve between a withdrawn position and an inserted position within the housing.
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