Patent ID: 7411198

Claim:
A method for detecting charged particle radiation or uncharged radiation that impinge on a radiation detector, said radiation detector producing pulses of electrical charge, said method comprising: providing a circuit comprised of a first node and a second node and further comprising a capacitance between said first node and said second node; connecting said circuit to said radiation detector such that said electrical charge produces a voltage across said capacitance at said first node; providing an amplifier and connecting an amplifier input to said first node; configuring said amplifier to produce output voltage pulses at an amplifier output in response to said pulses of electrical charge wherein a peak voltage of said output voltage pulses represents an energy in said charged particle radiation or uncharged radiation; providing a current feedback loop from said amplifier output to said amplifier input such that said current feedback loop supplies a current error signal to said amplifier input; and placing an operational amplifier in series with said feedback loop from said amplifier output to said amplifier input.