Difference between revisions of "05/19/2011 n's detector threshold calibration source/(w/source)"

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  <math>\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}</math>
 
  <math>\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}</math>
 +
 +
My data and calculation looks like:
 +
* -1500 V
 +
 +
[[File:Table 1500V.png : 800px]]
 +
 +
* -1250 V
 +
 +
[[File:Table 1250V.png : 800px]]

Revision as of 16:16, 3 June 2011

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Below are my counts rate measurements as function of threshold voltage for n's detector. The source was CF252. The distance between source and n's PMT was about 50 cm. The counts rate was calculated as: 

[math]\mbox{Rate} = \frac{N_{\mbox{source}} - N_{\mbox{w/source}}}{\mbox{Time}}[/math]


First I did my calibration for power supply voltage -1250 V:

Det1 calibraton source 1250V.png Det1 calibraton source 1250 log.png


Second I did my calibration for power supply voltage -1500 V:

Det1 calibraton source 1500V.png Det1 calibraton source 1500 log.png


And bellow I overlay both cases (-1250 V and -1500 V)

Det1 calibraton source 1250 1500.png Det1 calibraton source 1250 1500 log.png


There are no any plateaus, so what is the threshold should be?


Let's recalculate data using the formula: 

[math]\mbox{Ratio} = \frac{R_s - R_{w/s}}{R_{w/s}}[/math]

My data and calculation looks like:

  • -1500 V

File:Table 1500V.png : 800px

  • -1250 V

File:Table 1250V.png : 800px

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