G - Physics – 21 – K
Patent
G - Physics
21
K
358/27
G21K 4/00 (2006.01) G01T 1/164 (2006.01)
Patent
CA 1253264
HIGH EFFICIENCY FLUORESCENT SCREEN PAIR FOR USE IN LOW ENERGY X RADIATION IMAGING Abstract of the Disclosure A pair of front and back intensifying screens is disclosed capable of providing a sharp imagewise exposure of a dual coated silver halide radiographic element to light when the screens are imagewise exposed to X radiation predominantly of an energy level below 40 keV. The front intensifying screen is comprised of a fluorescent layer having modulation transfer factors greater than those of reference curve A in Figure 3 and capable of attenuating by 20 to 60 percent a reference X radia- tion exposure produced by a Mo target tube operated at 28 kVp with a three phase power supply, wherein the reference X radiation exposure passes through 0.03 mm of Mo and 4.5 cm of poly(methyl methacrylate) to reach the fluorescent layer mounted 25 cm from a Mo anode of the target tube and attenuation is measured 50 cm beyond the fluorescent layer. The back intensifying screen has modulation transfer factors greater than those of reference curve B in Figure 3 and is capable of attenuating by at least 60 percent X radiation received from the front screen when the reference exposure is repeated with both the front and back screens present.
527194
Brendel Kathleen E.
Dendunne Margaret S.
Luckey George W.
Roth Bernard
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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