Patent ID: 7521682
Filing Date: 2009-04-21
Classification: G01T

Abstract:
1. A radiation processing circuit operable for detecting charged particle radiation or uncharged radiation that impinge on a radiation detector, said radiation detector producing electrical pulses, said radiation processing circuit comprising: a memory for storing a digital leading edge threshold value; a digital to analog converter circuit operable to receive said digital leading edge threshold value and to produce an analog leading edge threshold voltage; input circuitry for receiving said electrical pulses produced by said radiation detector and producing processed voltage pulses, wherein said input circuitry comprises an integrator, wherein said integrator comprises an amplifier configured with a current feedback loop; and a comparator circuit operable for producing a first event signal in response to said processed voltage pulses and said analog leading edge threshold voltage, said comparator being configured such that once said first event signal is produced, subsequent event signals are prevented until a predetermined analog trailing edge threshold voltage is reached before said comparator resets so as to be operable to produce a subsequent event signal, wherein said analog trailing edge threshold voltage is different than said analog leading edge threshold voltage.