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Radiation from the uranium collimators of the Varian 4‐MeV accelerator
Author(s) -
Nibhanupudy J. Rao,
Henschke Ulrich K.
Publication year - 1977
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594343
Subject(s) - collimator , dosimetry , linear particle accelerator , uranium , shield , physics , radiation , optics , nuclear medicine , electromagnetic shielding , materials science , nuclear physics , beam (structure) , geology , medicine , petrology , quantum mechanics
The uranium collimator of the Varian 4‐MeV accelerator produces a dose rate of 100 mR/h near the collimator opening. It can be decreased to 4% by a 6‐mm Lucite shield at the level of the collimator opening. A better solution is a leadglass–mylar (LM) shield which decreases the uranium radiation to less than 3% and also provides better skin sparing during treatment than the open collimator.