title: Function to represent the variation of central axis tissue air ratio with two dimensions of 60Co rectangular fields.
abstract: Tissue air ratios (TAR) for rectangular 60Co fields depend on the two dimensions of the field. Functions which make use of the two dimensions of the field as parameters have been derived. The accuracy of fit such functions can give to the standard tissue air ratio data have been studied and discussed.
mesh_terms: D000388:Air; D003037:Cobalt Radioisotopes; D008433:Mathematics; D011879:Radiotherapy Dosage
chemical_list: D003037:Cobalt Radioisotopes