05/11/2011: Difference between revisions

Revision as of 19:47, 11 May 2011

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):

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:

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

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

@@ Line 10: / Line 10: @@
-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'''
+|}