| 1) an arrangement of radioactive sources attached to a mechanical support, to be placed at or near the surface to irradiate a superficial layer of tissue
2) a structure that collimates a beam of radiation; it may be open- or close-ended
3) a device that indicates the extent of the radiation field at a given distance from a source of radiation; it may or may not incorporate the collimating diaphragms; it may be open- or
close-ended
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