The tests were performed with and without the source of strontium.

Here are the results:

For:
+6 --- > 0,799V
+25---> 12V

  

Where the red curve is the data without source, and the blue one is with it.
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For:
+6 --- > 0,799V
+25--->13V

In the same colors for the curves
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For:
+6 --- > 0,799V
+25---> 14V

The measures were made with constant value to input control's voltage (+6 --> 0,799), then we could check the graphic's behavior when changing the high voltage (+25).
We have count per second in y axis and treshold in x axis.
As we can see in the graphs, the high voltage doesn't really interfere in the counts per second, then we can use any of those values.

Also we've made measures changing the value of input control's voltage (+6 ) and fixed the high voltage's value (+25) as 12V.

Between 0.000V and 0.700V we had no significant data
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For:
+6--> 0,800V
+25-->12V

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For:
+6-->0,850V
+25-->12V

  I don't know why the red curve doesn't appear in the graph, once the .C file is exactly the same but changing the values.
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For:
+6-->0,900V
+25-->12V

The red curve is missed again .


I really did not understand the behavior of those graphs and could not conclude anything.