05/11/2011
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Because is something wrong I decided to measure the counts rate as function of threshold energy. Maybe my threshold was incorrect.
Below are my results for n's detector with HAMAMATSU PMT (-1500 V):
So it looks like my previous threshold value (-500 mV) was not good. Let's set it up the -200 mV. And let's see does the n's detector sensitive to the source. The same set up and distances as before.
counts/sec (5 min test), no source | counts/sec (5 min test), with source on the top of PS1 | |
---|---|---|
n's | 19.89 | 0.26 (total 5966 cnts)58.84 | 0.29 (total 17652 cnts)
So now we see the source. The ratio are: