Title: Signal amplification by charging and illuminating a partially developed latent electrostatic image

Abstract: Method and apparatus for reducing X-ray dosage required for xeroradiographic examinations without reducing the relative information capacity of the images produced during the examination. In particular, a charged xerographic plate is positioned adjacent the object to be examined and penetrating X-ray radiation is projected through the object onto the plate surface, forming a latent electrostatic image on the surface of the plate. The penetrating radiation utilized is of a substantially lower dosage than normally utilized. The image is then partially developed with developing powder and the partially developed image is then charged and exposed to substantially uniform radiation. The exposed charged image is finally developed by applying additional developing powder thereto resulting in an enhanced image or signal.

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Inventors: Nelson, Alan C. (Los Angeles, CA, US)
Jeromin, Lothar S. (Sierra Madre, CA, US)

Application Number: 588573
Filing Date: 1975-06-20
Publication_date: 1977-08-02
Assignee: Xerox Corporation (Stamford, CT)
Primary Class(es): 399/130 378/28, 378/32, 399/159, 399/252, 430/31
Other Classes:
US Patent Ref:

2711481	Jun, 1955	Phillips	250/315.
2756676	Jul, 1956	Steinhilper	96/1.
2879397	Mar, 1959	Lehmann	250/315.
2914403	Nov, 1959	Sugarma, Jr.	96/1.
3526767	Sep, 1970	Roth et al.	355/3.
3615395	Oct, 1971	Yamaji et al.	355/3.
3640246	Feb, 1972	Jeromin et al.	118/629.
3646910	Mar, 1972	Cade et al.	118/629.
3650620	Mar, 1972	Hoyt	355/3.
3730709	May, 1973	Kinoshita et al.	355/3.
3813546	May, 1974	Proudian	250/315.
3850142	Nov, 1974	Juirblis et al.	118/637.
3914609	Oct, 1975	Jeromin	250/315.

Other Refs:
Primary Examiner: Stein, Mervin
Assistant Examiner:
Attorney: Ralabate; James J., Weiss; Franklyn C., Karambelas; Anthony W.