Variable aperture collimator for high energy radiation

Details Variable aperture collimator for high energy radiation Variable aperture collimator for high energy radiation

1982-03-03

1984-05-22

Church, Craig E.

X-ray or gamma ray systems or devices

Beam control

Collimator

378150, G21F 504

Patent

active

044505787

ABSTRACT:
An apparatus is disclosed providing a variable aperture energy beam collimator. A plurality of beam opaque blocks are in sliding interface edge contact to form a variable aperture. The blocks may be offset at the apex angle to provide a non-equilateral aperture. A plurality of collimator block assemblies may be employed for providing a channel defining a collimated beam. Adjacent assemblies are inverted front-to-back with respect to one another for preventing noncollimated energy from emerging from the apparatus. An adjustment mechanism comprises a cable attached to at least one block and a hand wheel mechanism for operating the cable. The blocks are supported by guide rods engaging slide brackets on the blocks. The guide rods are pivotally connected at each end to intermediate actuators supported on rotatable shafts to change the shape of the aperture. A divergent collimated beam may be obtained by adjusting the apertures of adjacent stages to be unequal.

REFERENCES:
patent: 2412662 (1946-12-01), Watson
patent: 2836729 (1958-05-01), Snarr

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