05/19/2011 n's detector threshold calibration source/(w/source)

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By Dr. Dale suggestions to make threshold adjusting of n's detectors according to [math](\mbox{RATE}_{source} - /\box{RATE}_{source})[/math] as function of threshold I did the following test.

Set up like that:

The voltages, thresholds and widths are:

	PMT voltage, V	threshold, mV	discr. width, ns
PS1	-1000	-100	50
PS1	-1000	-100	50
n's	-1500	varying	10