Radiant energy – Radiation controlling means
Patent
1977-04-26
1979-08-28
Smith, Alfred E.
Radiant energy
Radiation controlling means
250479, 250482, G21K 100
Patent
active
041662202
ABSTRACT:
A collimator cap for insertion over the output end of a dental x-ray machine collimator tube comprises a housing composed of a hollow longitudinal portion and a radially inwardly extending flanged portion at one end thereof forming an opening therethrough, a removable lead diaphragm positioned within the hollow longitudinal portion of the housing and adjacent the flanged portion, the lead diaphragm including an aperture therethrough of predetermined size and shape, and a shim for fixing the lead diaphragm in place. The end of the hollow longitudinal portion of the housing opposite the flanged portion is insertable over the output end of an x-ray machine collimator tube. In conjunction with use of the collimator add-on cap, a film cassette and cassette holder is used in order to take four exposures on one film, based on the x-ray beam size and shape eminating through the lead diaphragm aperture.
REFERENCES:
patent: 3102957 (1963-09-01), Slauson
patent: 3745344 (1973-07-01), Updegrave
patent: 3864576 (1975-02-01), Stevenson
patent: 4109156 (1978-08-01), Schroeder
Grigsby T. N.
Smith Alfred E.
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