Abstract: A device for storing a source of photons and for irradiating a body by the radiation from said source, comprisinga body for biological protection provided with a cylindrical cavity of circular section and two so-called first and second passages respectively, these passages opening at one and the other of their ends in said cavity and on the outer wall of the body,a disc for biological protection, whose shape is complementary of that of the cavity of the body and presenting, on the one hand, a housing centered on an axis perpendicular to the axis of the cavity, this housing opening out on the side wall of the disc,a source of Y radiation contained in said housing,a precollimator disposed at right angles to said first passage,means for rotating said disc between a first position for which said source is opposite the precollimator and a second position for which the source is in stored position.

Abstract: An irradiation apparatus for obtaining an irradiation beam having precise and easily adjustable dimensions. This apparatus comprises more particularly a secondary collimation device having an axis Y--Y, removably fixed to the mobile arm of the irradiation apparatus and comprising a conical pot, two pairs of frames which support collimating plates and are movable about shafts fixed to said conical pot, each of said frames being connected to said conical pot by means of a compass system formed from legs hinged together about shafts. With said frames are associated mobile antipenumbra plates whose position is checked by means of a feeler system.