CH He3 Background Measurements
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Be careful with pre-amp. Bumping SHV cable from pre-amp to He3 tube results in false counts leading to hundreds of extra counts.
| 1250V Source Out Data | |||||||
| Run Number | Configuration | Discriminator Threshold (mV) | Cf-252 Button Source | Counts | Run Time (Sec) | Count Rate (Hz) | Uncertainty |
| 1 | Unshielded detector at +1250V | 255 | No | 30 | 300 | ||
| 2 | Unshielded detector at +1250V | 255 | No | 18 | 300 | ||
| 3 | Unshielded detector at +1250V | 255 | No | 31 | 300 | ||
| 4 | Unshielded detector at +1250V | 255 | No | 24 | 300 | ||
| 5 | Unshielded detector at +1250V | 255 | No | 39 | 300 | ||
| 6 | Unshielded detector at +1250V | 255 | No | 42 | 300 | ||
| 7 | Unshielded detector at +1250V | 255 | No | 34 | 300 | ||
| 8 | Unshielded detector at +1250V | 255 | No | 45 | 300 | ||
| 9 | Unshielded detector at +1250V | 255 | No | 34 | 300 | ||
| 10 | Unshielded detector at +1250V | 255 | No | 36 | 300 |