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American Journal of Roentgenology, Vol 130, Issue 1, 150-153
Copyright © 1978 by American Roentgen Ray Society

Articles

A study of dose distribution patterns from cobalt-60 and Varian Clinac-4 beams

R Nair and M Kartha

Dose distribution patterns of 4 MV x-rays from a Varian Clinac 4 linear accelerator are compared with those from a 60Co teletherapy machine. Field flatteners of lead and depleted uranium were used. Dose distribution maps display the off-axis high dose or "horns" with lead filters and circular dose distribution patterns. The uranium field flattener clearly "clipped the horns" and eliminated circular dose distribution patterns with larger fields.
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Copyright © 1978 by the American Roentgen Ray Society.