Difference between revisions of "05/09/2011"
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| − | Second the CF-243 source is somewhere aside (40 - 60 cm away from detectors | + | Second the CF-243 source is somewhere aside (on the table 40 - 60 cm away from detectors): |
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Revision as of 03:24, 10 May 2011
I did some counts test like:
The powers were:
PS1 and PS2: -1000 V n's: -1100 V
The PMT for n's detectors is PMT HAMAMATSU R580 with supply voltage 1250/1500 V. But I have used the value above, because I though the counts rate was reasonable. See my table below.
The thresholds were:
PS1 and PS2: -80 mV n's: -60 mV
Let see what we have. First is without CF-243 source:
| counts/min | counts/min | |
|---|---|---|
| PS1 | 153 counts/min | 170 counts/min |
| PS2 | 150 counts/min | 173 counts/min |
| PS1+PS2 | 3.8 | 5.8 |
| n's | 358 counts/min |
Second the CF-243 source is somewhere aside (on the table 40 - 60 cm away from detectors):
| counts/min | counts/min | |
|---|---|---|
| PS1 | 373 counts/min | 362 counts/min |
| PS2 | 654 counts/min | 656 counts/min |
| PS1+PS2 | 2.0 | 6.0 |
| n's | 358 counts/min | 368 counts/min |
Third the CF-243 source is on the top of PS1:
| counts/min | counts/min | |
|---|---|---|
| PS1 | 364,570 counts/min | 363,477 counts/min |
| PS2 | 19,832 counts/min | 19.980 counts/min |
| PS1+PS2 | 993 | 959 |
| n's | 369 counts/min | 352 counts/min |