Download EqField.prc 
PalmOS PDA Applications: Equivalent FieldThe equivalent field is defined as the standard (i.e. circular or square) field that has the same central axis depth dose characteristics as the given nonstandard field. The equivalent field calculator implements the tables and equations of BJR Supplement 25 (1996), Day MJ and Aird EGA, The equivalent field method for dose determinations in rectangular fields, Appendix A, Central Axis Depth Dose Data for Use in Radiotherapy: 1996, BJR Supplement 25, pp.138151. The BJR Supplement 25 tables provide data for rectangular fields up to 60 x 60 cm. Click here to download the self extracting archive: Eq Field 1.0.0, last updated 9/24/03. Download: EqField.prc.zip (16K)Below are some screen captures of the calculator running under the PalmOS 5.2.1 simulator:
