Grid control system for eliminating soft radiation emissions...

Details Grid control system for eliminating soft radiation emissions... Grid control system for eliminating soft radiation emissions...

2008-08-18

2010-06-22

Kiknadze, Irakli (Department: 2882)

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

C378S101000

Reexamination Certificate

active

07742571

ABSTRACT:
A system and method for controlling the radiation emissions from an x-ray tube having an anode, a cathode, and a grid is disclosed. The system and method uses a continuous high voltage across the cathode and the anode of the x-ray tube, so that a high voltage is continuously applied to the x-ray tube between the cathode and the anode. The flow of electrons between the cathode and the anode is then controlled by a pulsed high voltage to the grid, the pulsed high voltage being of substantially the same magnitude as the continuous high voltage and being switched at a frequency of about one microsecond to provide alternate the polarity of the switched high voltage to the grid, so that voltage between the cathode and the anode is switched by the voltage applied to the grid by the source of pulsed high voltage, so that soft radiation emissions from the x-ray tube are minimized or eliminated.

REFERENCES:
patent: 4723263 (1988-02-01), Birnbach et al.
patent: 5430641 (1995-07-01), Kates
patent: 5517545 (1996-05-01), Nakamura et al.
patent: 5615093 (1997-03-01), Nalbant
patent: 6104146 (2000-08-01), Chou et al.
patent: 6882703 (2005-04-01), Price et al.

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