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G - Physics

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G21K 5/00 (2006.01) G21G 4/08 (2006.01) G21K 1/02 (2006.01) G21K 5/04 (2006.01)

Patent

CA 1080371

ABSTRACT OF THE DISCLOSURE In the illustrated embodiments, an irradiation apparatus for medical purposes has diaphragm plates with a maximum rectangular aperture defining maximum beam angles (.alpha.) in respective orthogonal planes. The shielding material surrounding an axially elongated radioisotope is shaped in conformity with the angles (.alpha.) so as to provide low absorption acute angle paths from the entire (cylindrical) periphery of the radioisotope, such that the falloff in intensity of the radiation at right angles to the central ray is minimized over the entire cross section of the diaphragm aperture, To minimize the ex- tent of the penumbral region, the radioisotope may be frusto-conical with a slope angle .beta. not greater than about .alpha./2. The shielding material within a cylindrical source - housing preferably closely encircles the remote end of the radioisotope unit to securely position the same, while various low absorp- tion arrangements serve to securely retain the frontal end.

274080

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