[Dosimetric characteristics of the C-4 grid diaphragm from a kit of shaping fittings]

A kit of equipment is manufactured at present for gamma-beam therapeutic units. The authors describe the design and geometrical parameters of a new grid diaphragm C-4 included in this kit. Characteristics of a dose field, formed by this grid, have been studied and are presented in this paper. Particular attention during the calculation of the dose time of an irradiation session under the opening should be drawn to an error in beam alignment.