Difference between revisions of "Photon flux proportionality"

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[[File:flux_DU_r2506.png | 400 px]]
 
[[File:flux_DU_r2506.png | 400 px]]
  
The average photon flux increased from 90 <math>e^+/min</math> to 350 <math>e^+/min</math> and the ratio is 350/90 = 3.9.
+
The average photon flux increased from 90 <math>e^+/min</math> to 350 <math>e^+/min</math> and the ratio is 350/90 = 3.9 .
  
 
The number of neutrons used to do narmalization, i.e. the sum of the number of neutrons in three detectors placed at 0 deg left, 90 deg bottom and 0 deg right changed as follows:
 
The number of neutrons used to do narmalization, i.e. the sum of the number of neutrons in three detectors placed at 0 deg left, 90 deg bottom and 0 deg right changed as follows:
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run 2506: SUM(0-90-0) = 2195 neutrons
 
run 2506: SUM(0-90-0) = 2195 neutrons
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 +
The neutron number ratio is 2195/518 = 4.2 .
 +
 +
That means that photon flux monitor can be used for the purpose of relative normalization.

Revision as of 17:19, 10 June 2013

If we compare the photon flux from the two runs with DU target

run 2467

Flux DU r2467.png

and

run 2506

Flux DU r2506.png

The average photon flux increased from 90 [math]e^+/min[/math] to 350 [math]e^+/min[/math] and the ratio is 350/90 = 3.9 .

The number of neutrons used to do narmalization, i.e. the sum of the number of neutrons in three detectors placed at 0 deg left, 90 deg bottom and 0 deg right changed as follows:

run 2467: SUM(0-90-0) = 518 neutrons

run 2506: SUM(0-90-0) = 2195 neutrons

The neutron number ratio is 2195/518 = 4.2 .

That means that photon flux monitor can be used for the purpose of relative normalization.