beam edge

beam edge

[′bēm ‚ej]
(physics)
The locus of positions at which the intensity of a beam of particles or radiation is 10% of that along the axis of the beam.
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References in periodicals archive ?
It also gives the physician the confidence in knowing that the beam edge is similar to what was achieved with older customized blocks with particular relevance to treatment of head and neck cancer and prostate cancer.
For much of the show, the units are in no-color, and we are able to use the scroller to run various grades of Rosco frost for perfect beam edges.