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- W2091306182 abstract "A comprehensive set of dosimetric measurements has been made on the Mevatron 77.80.67 18-MV photon beam. Percentage depth dose, dose in the buildup region, field size dependence of output, transmission through lead, tray attenuation, and isodose curves for the open and wedged fields were measured using an ionization chamber in water and polystyrene phantoms. These dosimetric measurements sufficiently characterized the beam to permit clinical use. The depth dose at 10-cm depth for a 10×10 cm2 field at 100-cm source-to-skin distance (SSD) is 80.9%, which meets design specifications. Central axis depth-dose data were fitted to within 0.5% by a set of polynomial equations utilizing a two-dimensional linear regression analysis. Tissue–maximum ratios calculated from depth-dose data agree with measured data to within 2%. Output differences as large as 2.5% were measured for rectangular fields depending on which collimator jaws defined the long dimension of the field. The field size dependence of output was fit to within ±0.1% by a linear regression. The half-value thickness of the beam was measured to be 13 mm of lead." @default.
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- W2091306182 date "1984-09-01" @default.
- W2091306182 modified "2023-10-18" @default.
- W2091306182 title "Dosimetric characterization of the 18-MV photon beam from the Siemens Mevatron 77 linear accelerator" @default.
- W2091306182 doi "https://doi.org/10.1118/1.595564" @default.
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