-- AndrejStuden - 16 Dec 2008

Comparison of 241-Am spectrum taken with a pair of GP3 in October of 2004 and a spectrum of the same source taken with GP7 in December of 2008. The same features can be distinguished, however, they are shifted in GP7 spectrum.

testAm_U130V_vfp711mV_thr16_serial.linearity.gif

Comparing with a list of lines for Am spectrum I first noted the peaks on the above image. One can see that GP3 is better at placing peaks where they should appear. Below is a graph of measured vs. actual peak position for the 5 peaks (4 peaks for GP7 data) shown above. In the same graph, the plot of difference of peak positions determined by GP7 and GP3 is shown. The difference is practically constant for all 4 peaks. The same analysis was used for both data sets.

testAm_U130V_vfp711mV_thr16_serial.linearityGraph.gif

The offset of 2 keV is also present in sparse readout. BTW the common mode is gone!

testAm_U130V_vfp711mV_thr16_sparse.linearity.gif

And here is the common mode for the serial run, showing a much improved performance.

testAm_U130V_vfp711mV_thr16_serial.commonMode.gif

Topic revision: r2 - 16 Dec 2008 - 10:34:11 - AndrejStuden
 
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