Difference between revisions of "June, 7, 2007 Cf rate measurements using Photonics PMT"
| Line 10: | Line 10: | ||
3: Replaced steel wall with ### cm thick lead shielding brick | 3: Replaced steel wall with ### cm thick lead shielding brick | ||
| − | 4: Replaced lead brick with ### cm thick | + | 4: Replaced lead brick with ### cm thick paraffin block ( Paraffin N.F. , Household wax made by Parowax. 4 cackes, total net weight 16 oz (454 g)) |
| − | 5: Increased thickness of | + | 5: Increased thickness of paraffin block to #### cm |
Revision as of 21:53, 7 June 2007
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 paraffin block ( Paraffin N.F. , Household wax made by Parowax. 4 cackes, total net weight 16 oz (454 g))
5: Increased thickness of paraffin block to #### cm
| Configuration | Rate (counts/min) | Error in Rate (Counts/min) |
|---|---|---|
| 1 | 0 | 0 |
| 2 | 0 | 0 |
| 3 | 0 | 0 |
| 4 | 0 | 0 |
| 5 | 0 | 0 |