Comparison of the cobalt-60 photon beam dose distributions corrected by three shift-factors for oblique incidence.
A new factor for shifting isodoes curves for oblique Co-60 photon beams has been deduced. Like the two other known factors, this shift factor depends on the source-to-surface distance (SSD), the depth dose (D) and the derivative of D with depth. A comparison of corrected dose distributions has been made by using the three shift factors for the 15 X 15-cm2 field incident on a surface at 45 degrees. In general, the corrected dose distributions given by the new shift factor show the best agreement with the measured depth dose data.
D003037:Cobalt Radioisotopes / Q000627:therapeutic use*; D006801:Humans; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000379:methods; D012542:Scattering, Radiation
D003037:Cobalt Radioisotopes