Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1986-12-22
1987-12-01
Howell, Janice A.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
378 37, G01J 158
Patent
active
047106379
ABSTRACT:
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 FIG. 3 and capable of attenuating by 20 to 60 percent a reference X radiation 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 FIG. 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.
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Brendel Kathleen E.
Den Dunne Margaret S.
Luckey George W.
Roth Bernard
Eastman Kodak Company
Howell Janice A.
Rauchholz William F.
Thomas Carl O.
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