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  • Title: "Measurements of surface dose using build-up curves" obtained with an extrapolation chamber.
    Author: Manson DJ, Velkley D, Purdy JA, Oliver GD.
    Journal: Radiology; 1975 May; 115(2):473-4. PubMed ID: 806935.
    Abstract:
    Surface dose was measured in an extrapolation chamber and was found to be less than previously reported. The slope of the build-up curve was less steep with the Clinac 4 than with 60-Co and much steeper with the Clinac 35 at 25 MV than with the betatron at the same energy. The gradient of the depth-dose curve in the build-up region is probably the best indicator of skin damage.
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