Difference between revisions of "Cf252 NaI detector test. 12 Apr 2012"
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! scope="col" width="66%" | Comments | ! scope="col" width="66%" | Comments | ||
|- | |- | ||
| − | |2775||Co-60 | + | |2775||Co-60 away from NaI ||2" Pb around, no front shielding ||133,884 || || |
|- | |- | ||
| − | |2776||bkgd ||2" Pb around, no front shielding|| || || | + | |2776||bkgd ||2" Pb around, no front shielding ||7,289 || || |
|- | |- | ||
| − | |2777||Co-60 | + | |2777||Co-60 infront of NaI ||2" Pb around, no front shielding ||313,427 || |
| + | |align="left"|clear 2 big 1.2 and 1.4 MeV peaks, small peak around 4.3 MeV | ||
Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl | Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl | ||
|- | |- | ||
Revision as of 21:05, 12 April 2012
- 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 | clear 2 big 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 shielding | 41.75 Hz | ||
| 2779 | bkgd | all around 2" Pb around | 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 | 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" NoBorated 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 | Cf252 | 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" NoBorated 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
