초록 ▼

An irradiation apparatus including an x-ray or gamma-ray source, an optical distance and surface profile measuring device, and means for adjusting the dose of radiation delivered to a target surface by the source based on a precise measured distance from the source to the target surface. The measuri

An irradiation apparatus including an x-ray or gamma-ray source, an optical distance and surface profile measuring device, and means for adjusting the dose of radiation delivered to a target surface by the source based on a precise measured distance from the source to the target surface. The measuring device has a laser or other beam source and photodetector in known fixed relationship to the radiation source, and a pair of mirrors which are turnable to direct the laser beam from the laser to a sequence of selected spots on the target surface and then to the photodetector. Knowing the geometry of the system, the distance from the radiation source to the sequence of spots on the target surface can be computed. In one embodiment the two mirrors define a baseline of a triangle, with the laser and photodetector lying proximate to the baseline. One mirror rotates at a known speed and sensors determine the orientation of the mirror when that mirror directs light reflected from the target onto the photodetector. The orientation angles of the mirror, together with the width of the baseline, determine the altitude of the triangle formed by the mirrors and the target surface. The altitude combined with the known distance of the radiation source to the baseline determine distances for a profile of the surface. A plurality of profiles form a three-dimensional topographic surface map.

대표청구항 ▼

Apparatus for delivering a radiation dose comprising, radiation source means for producing a beam of ionizing gamma ray or x-ray radiation directed so as to deliver a dose of said radiation to an area of a target surface, a light source emitting a light beam in a direction transverse to the directio

Apparatus for delivering a radiation dose comprising, radiation source means for producing a beam of ionizing gamma ray or x-ray radiation directed so as to deliver a dose of said radiation to an area of a target surface, a light source emitting a light beam in a direction transverse to the direction of the ionizing radiation beam, a photodetector, positioned to receive light scattered from the target surface, means for scanning the light beam over the area of the target surface, means for forming a three-dimensional surface profile map of said area of the target surface without movement of the radiation source means or of the light source, and means responsive to said surface profile map for adjusting said dose of radiation from said radiation source over the area of the target surface, so that the radiation source means and the light source may be operated simultaneously.