Patent Document ID: 8704186
Application ID: 12948695
Patent Flag: 1

Claim One:
1. A standalone multichannel analyzer (MCA) for collecting and analyzing radiation data, comprising: a preamplifier for converting a charge pulse of a radiation detection event into an analog signal characterized by a step rise from an external preamplifier; an anti-aliasing filter for bandlimiting the analog signal and having means for adjusting gain and offset; an analog to digital converter (ADC) which converts the analog signal from the anti-aliasing filter to a digital signal; and a digital processor for processing the digital signal to produce an energy and time associated with the arrival of each radiation pulse, said digital processor including: a digital pulse shaping filter for converting the step rise of the digital signal into a unipolar shaped digital pulse; an adaptive noise removal circuit comprising an adaptive predictive filter and adapted to remove a predicted signal produced by said adaptive predictive filter from the unipolar shaped digital pulse output of the digital pulse shaping filter, and a multiplexor adapted to provide as input to the adaptive predictive filter either output from the digital pulse shaping filter or the predicted signal output from the adaptive predictive filter; and a control circuit adapted to switch the adaptive noise removal circuit between training and prediction modes of operation, to lock the adaptive noise removal circuit in the prediction mode of operation during a radiation detection event so that the adaptive filter is not updated during the radiation detection event, and to update weights of a transfer function of the adaptive predictive filter in the training mode of operation.