title: Mantle field dosimetry comparing 4 MV with cobalt 60.
abstract: Three off-axis dosimetric parameters were evaluted for identical mantle fields using the Varian 4 MV linear accelerator and a Picker C8M cobalt-60 unit. These parameters were dose distribution, skin dose and integral dose. Comparisons showed higher doses in all three categories with the 4 MV  accelerator when the tumor dose is specified at the central axis midline. These results emphasize  the importance of off-axis dosimetry with both machines.
mesh_terms: D003037:Cobalt Radioisotopes / Q000627:therapeutic use*; D006689:Hodgkin Disease / Q000532:radiotherapy*; D006801:Humans; D011867:Radioisotope Teletherapy; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D013819:Thermoluminescent Dosimetry
chemical_list: D003037:Cobalt Radioisotopes