Difference between revisions of "05/11/2011"

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So it looks like my previous threshold value (-500 V) was not good. Let's set it up the -200 V. And see what happens.
+
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 as before, the distances are the same:
 
 
 
[[File:Detector1.png | 400px]]
 
 
 
 
 
 
 
First he CF-243 source is far far away (sealed in the safe):
 
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
! scope="col" width="50" |  
 
! scope="col" width="50" |  
! scope="col" width="50" | counts/min (1 min test)
+
! scope="col" width="50" | counts/sec (5 min test), no source
! scope="col" width="50" | counts/min (1 min test)
+
! scope="col" width="50" | counts/sec (5 min test), with source on the top of detector
! scope="col" width="50" | counts/min (1 min test)
 
! scope="col" width="50" | counts/min (1 min test)
 
! scope="col" width="50" | avg counts/min
 
|-
 
!PS1
 
|
 
|-
 
!PS2
 
|
 
 
|-
 
|-
 
!n's  
 
!n's  
 
|
 
|
|}
 
 
 
Now the CF-243 source is on the top of PS1:
 
{| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 
! scope="col" width="50" |
 
! scope="col" width="50" | counts/min (1 min test)
 
! scope="col" width="50" | counts/min (1 min test)
 
! scope="col" width="50" | counts/min (1 min test)
 
! scope="col" width="50" | counts/min (1 min test)
 
! scope="col" width="50" | avg counts/min
 
|-
 
!PS1
 
|378,893||378,612||377,909||378,665||'''378,519.7'''
 
|-
 
!PS2
 
|22,729||22,819||22,572||22,530||'''22,662.5'''
 
|-
 
!PS1+PS2
 
|1044||1021||1023||975||'''1015.7'''
 
|-
 
!n's
 
|200||210||228||219||'''214.2'''
 
 
|}
 
|}

Revision as of 19:56, 11 May 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):

Det1 callibration.png


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

counts/sec (5 min test), no source counts/sec (5 min test), with source on the top of detector
n's