June, 7, 2007 Cf rate measurements using Photonics PMT
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Cf source was placed X cm away from face of PHotonics PMT. The PMT output signal was descriminated by a Lecroy Model # YYY descriminator set to pass any voltage below -0.5 mV. The descriminated output was then sent to a scaler Model ####.
Configuration Definitions
1: Placed the Cf source ## cm from face of Scintillator. neutrons passing through scintillator would also pass through PMT
2: Inserted a ### cm thick steel shielding wall between Scintillator and Cf source. Right up against Scintillator
3: Replaced steel wall with ### cm thick lead shielding brick
4: Replaced lead brick with ### cm thick parafin block
5: Increased thickness of parafin block to #### cm
| Configuration | Rate (counts/min) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 3 | 6 |
| 3 | 6 |