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 up the -200 V:
+
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.
 +
 
 +
 
 +
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;"
 +
! 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
 +
|
 +
|-
 +
!PS2
 +
|
 +
|-
 +
!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 19:47, 11 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 V) was not good. Let's set it up the -200 V. And see what happens.


The same set up as before, the distances are the same:

Detector1.png


First he CF-243 source is far far away (sealed in the safe):

counts/min (1 min test) counts/min (1 min test) counts/min (1 min test) counts/min (1 min test) avg counts/min
PS1
PS2
n's


Now the CF-243 source is on the top of PS1:

counts/min (1 min test) counts/min (1 min test) counts/min (1 min test) counts/min (1 min test) 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
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