Difference between revisions of "Cf252 NaI detector test. 12 Apr 2012"
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| Line 97: | Line 97: | ||
|- | |- | ||
|2793||bkg || || | |2793||bkg || || | ||
| − | |align="left"|detector | + | |align="left"|shielding: detector -> 2" Pb around -> 2" Poly around |
| + | V = -1014 V | ||
|- | |- | ||
|2794||Cf252 || ||1.24 Hz | |2794||Cf252 || ||1.24 Hz | ||
| − | |align="left"|new power supply N471 CAEN, -1035V<br> | + | |align="left"|shielding: Al around the NaI -> borated shielding (not infront) |
| − | Cf252 17 inch away from detector | + | new power supply N471 CAEN, -1035V<br> |
| − | + | Cf252 17 inch away from detector, DAQ crashed | |
| − | DAQ crashed | ||
|- | |- | ||
|2795||Cf252 ||55,458 ||88.23 Hz | |2795||Cf252 ||55,458 ||88.23 Hz | ||
|align="left"|4" Pb infront of Cf252 + Al around and inside the shilding | |align="left"|4" Pb infront of Cf252 + Al around and inside the shilding | ||
| + | 10 min | ||
|- | |- | ||
|2796||Cf252 ||130,122 ||79.23 Hz | |2796||Cf252 ||130,122 ||79.23 Hz | ||
| − | |align="left"|27 min, looking for (n,gamma) capture effect, 10B | + | |align="left"|27 min, looking for (n,gamma) capture effect, 10B: 4.44 MeV (100%) |
| − | geometry: Cf252 -> bored Poly -> 2" Al ----> NaI | + | geometry: Cf252 -> 5" Pb -> bored Poly (small brick) -> 2" Al ----> NaI |
|- | |- | ||
|2797||Cf252 ||80,763 ||81.79 Hz | |2797||Cf252 ||80,763 ||81.79 Hz | ||
| − | |align="left"|geometry: Cf252 -> bored Poly -> ----> NaI | + | |align="left"|geometry: Cf252 -> 5" Pb -> bored Poly (whole) -> 2" Al ----> NaI |
|- | |- | ||
|2798||Cf252 ||134,725 ||95.38 Hz | |2798||Cf252 ||134,725 ||95.38 Hz | ||
| Line 119: | Line 120: | ||
23 min | 23 min | ||
|- | |- | ||
| − | |||
|2799||bkg ||21,6941 ||37.86 Hz | |2799||bkg ||21,6941 ||37.86 Hz | ||
|align="left"|background long 108 min run | |align="left"|background long 108 min run | ||
Revision as of 23:01, 13 April 2012
041212
- NaI detector,
- 300 mV threshold on gate channel
- signal ADC4
- -1030V at the beginning
- -1055V at the end of run
| Run # | source | shielding | cnts | rate | Comments |
|---|---|---|---|---|---|
| 2775 | Co-60 away from NaI | 2" Pb around, no front shielding | 133,884 | ||
| 2776 | bkgd | 2" Pb around, no front shielding | 7,289 | ||
| 2777 | Co-60 infront of NaI | 2" Pb around, no front shielding | 313,427 | 1.2 and 1.4 MeV peaks, small peak around 4.3 MeV
Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl | |
| 2778 | bkgd | 2" Pb around, no front | 15,822 | 41.75 Hz | |
| 2779 | bkgd | all around 2" Pb around | 8,566 | 15.74 Hz | good area around 2000-3800 channels |
| 2780 | Cf252 | all around 2" Pb around | 12 kHz | Cf252 just in front of NaI | |
| 2781 | Cf252 | all around 2" Pb around | 5.4 kHz | Cf252 about 15 cm away from NaI | |
| 2782 | Cf252 | all around 2" Pb around | 607,790 | 1.1 kHz | Cf252 17" away from NaI |
| 2784 | Cf252 | all around 2" Pb around | 1,372,745 | 1,142 Hz | 20 min run. No shielding in front |
| 2785 | Cf252 | all around 2" Pb around | 153,508 | 129.5 Hz | 20 min run. 2" Pb just after Cf252 |
| 2787 | Cf252 | all around 2" Pb around | 1,231,537 | 1,024 Hz | 20 min run. 2" Borated Poly just after Cf252 |
| 2788 | Cf252 | all around 2" Pb around | 1,225,232 | 1,020 Hz | 20 min run. 2" Unborated Poly just after Cf252 |
| 2790 | Cf252 | all around 2" Pb around | 132,067 | 111.6 Hz | 20 min run. 2" Pb, 2" Borated Poly just after Cf252 |
| 2791 | Cf252 | all around 2" Pb around | 108,603 | 89.6 Hz | 20 min run. 4" Pb just after Cf252 |
| 2792 | bkgd | all around 2" Pb around | 45,904 | 25.04 Hz | 20 min run. background checking |
- rise time of NaI 50 ns
- decay time of NaI 3 us
- run 2784: Cf252 no shielding infront. 1,372,745 events
- run 2787: Cf252 2" Borated Poly infront. 1,231,537 events
- run 2788: Cf252 2" Unborated Poly infront. 1,225,232 events
- run 2792: background checking. 45,904 events
- run 2785: Cf252 2" Pb infront. 153,508 events
- run 2790: Cf252 2" Pb + 2" Borated Poly infront. 132,067 events
- run 2791: Cf252 4" Pb infront. 108,603 events
041312
- NaI detector,
- 300 mV threshold on gate channel
- signal ADC4
- -1036V switched to modern power supply
| Run # | source | cnts | rate | Comments |
|---|---|---|---|---|
| 2793 | bkg | shielding: detector -> 2" Pb around -> 2" Poly around
V = -1014 V | ||
| 2794 | Cf252 | 1.24 Hz | shielding: Al around the NaI -> borated shielding (not infront)
new power supply N471 CAEN, -1035V | |
| 2795 | Cf252 | 55,458 | 88.23 Hz | 4" Pb infront of Cf252 + Al around and inside the shilding
10 min |
| 2796 | Cf252 | 130,122 | 79.23 Hz | 27 min, looking for (n,gamma) capture effect, 10B: 4.44 MeV (100%)
geometry: Cf252 -> 5" Pb -> bored Poly (small brick) -> 2" Al ----> NaI |
| 2797 | Cf252 | 80,763 | 81.79 Hz | geometry: Cf252 -> 5" Pb -> bored Poly (whole) -> 2" Al ----> NaI |
| 2798 | Cf252 | 134,725 | 95.38 Hz | geometry: no Boron but Al is still in
23 min |
| 2799 | bkg | 21,6941 | 37.86 Hz | background long 108 min run
detector + 2" Pb around (except on the top of detector was 2" Al) + 2" Poly around |
| 2800 | bkg | background long run
detector + 2" Pb around + 4" Poly borated and unborated around, no Al inside |
- run 2799
- run 2800