05/11/2011: Difference between revisions
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So now we see the source. The ratio are: | So now we see the source. The ratio are: | ||
<math>\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96<math> | <math>\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96 </math> | ||
Revision as of 20:12, 11 May 2011
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 V) was not good. Let's set it up the -200 V. 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[math]\displaystyle{ \pm }[/math]0.26 (5966 cnts) | 58.84[math]\displaystyle{ \pm }[/math]0.29 (17652 cnts) |
So now we see the source. The ratio are:
[math]\displaystyle{ \frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96 }[/math]