Heinz:
Dear Callum - many thanks for the nice slides.
Small comments:
slide 1 - maybe change "Web cam based" in title to "CMOS sensor cased" to make a more direct connection to our porject.
slide 9: Do you know how thick the IR window is? Maybe this shields a lot of the ALPHAs and causes a significant energy loss which will smear your alpha peak position in the brightness distribution....
slide 16/17: it may be interesting to give the "no source" number of hits you observe with the same setting to have a comparison of your alpha measurements with an "empty" measurement.
Did you compare the number of observed particle hits to the activity of the source?