Diaphragm for a in the electron irradiation therapy is to be inserted, the applicator and the applicator

摘要

Diaphragm (1) for a radiation therapy in of the electrons to be used as an applicator (7), characterized in that the shield (1) in a three layer arrangement is constructed in the direction of irradiation (3) of the electrons layer which faces (4) is made of a first material with a first order number, which in the case of a material containing a plurality of elements is an average atomic number, there is, the smaller than a second order number, which in the case of a material containing a plurality of elements is an average atomic number, a second material of the central layer (5), which is smaller than a third order number, which in the case of a material containing a plurality of elements is an average atomic number, of a third material one of the beam direction (3) of the electrons layer (6) is facing away from.