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  • Title: A study of dose distribution patterns from cobalt-60 and Varian Clinac-4 beams.
    Author: Nair R, Kartha M.
    Journal: AJR Am J Roentgenol; 1978 Jan; 130(1):150-3. PubMed ID: 413401.
    Abstract:
    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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