Phase I Rinal Report: Ultra-Low Background Alpha Activity Counter Page: 3 of 35
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developed an analytical model of signal generation as the charges in the track drift across the counter and
showed that the features observed in the real signals closely resembled those predicted by the model. In
addition, we captured events where the track charge was indeed collected by two electrodes and showed
that, by summing them, we could recover the preamplifier signal shape appropriate to collection by a
single electrode. We thereby showed that we could achieve noise levels that would allow us to analyze
our signals with even higher precision than in our current instrument while being able to increase the
measured sample area to the values needed to attain the proposed sensitivity. We also examined the
Phase II electronics issue and produced a high level design showing that we could construct digital signal
processing electronics that would fully meet our segmented electrode needs for a cost of less than $500
per channel. The only Phase I goal we did not meet was to produce a software viewer that would have
simplified the collection and inspection of multiple signal traces simultaneously. The reason for this
shortfall was that we encountered unexpected difficulties with microphonic noise and had to expend our
limited time and money resources in removing this noise in order to provide the critical, proof of
principle demonstration that signal noise reduced with electrode size as predicted.
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Warburton, W.K. Phase I Rinal Report: Ultra-Low Background Alpha Activity Counter, report, July 22, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc782708/m1/3/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.