Absorbed dose distributions for electron beams from the sagittaire. Systematic measurements and their representation for introduction into a computer.

The principle of representation used consists of a description of the differences between actual dose distributions and ideal dose distributions. This description is based on relations linked to known discrete geometrical and physical quantities. The use of this principle is demonstrated for electron beams delivered by the CGR MeV Sagittaire linear accelerator: a systematic analysis of the results of the measurements leads to two methods based on elementary mathematics: the first uses successively two relations describing the isodose curves, and the second computes the dose for each point defined by its coordinates.