Difference between revisions of "05/11/2011"

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[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
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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.
 
Because is something wrong I decided to measure the counts rate as function of threshold energy. Maybe my threshold was incorrect.
  
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[[File:Det1 callibration.png | 1000 px]]
 
[[File:Det1 callibration.png | 1000 px]]
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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.
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{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
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! scope="col" width="50" |
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! scope="col" width="50" | counts/sec (5 min test), no source
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! scope="col" width="50" | counts/sec (5 min test), with source on the top of PS1
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|-
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!n's
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|19.89<math>\pm</math>0.26  (total 5966 cnts) || 58.84<math>\pm</math>0.29  (total 17652 cnts)
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|}
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So now we see the source. The ratio are:
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<math>\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96 </math>

Latest revision as of 04:59, 12 May 2011

Go Back


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):

Det1 callibration.png


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[math]\pm[/math]0.26 (total 5966 cnts) 58.84[math]\pm[/math]0.29 (total 17652 cnts)

So now we see the source. The ratio are: 

[math]\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96 [/math]
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