Difference between revisions of "June, 7, 2007 Cf rate measurements using Photonics PMT"
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| Line 4: | Line 4: | ||
= Configuration Definitions = | = Configuration Definitions = | ||
| − | 1 : | + | 1: Placed the Cf source ## cm from face of Scintillator. neutrons passing through scintillator would also pass through PMT |
| − | 2: | + | 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 | ||
| Line 12: | Line 18: | ||
! Configuration || Rate (counts/min) | ! Configuration || Rate (counts/min) | ||
|- | |- | ||
| − | | 1 || 2 | + | | 1 || 0 |
| + | |- | ||
| + | | 2 || 0 | ||
| + | |- | ||
| + | | 3 || 0 | ||
| + | |- | ||
| + | | 4 || 0 | ||
| + | |- | ||
| + | | 5 || 0 | ||
|- | |- | ||
| − | | 3 || | + | | 3 || 6 |
|- | |- | ||
| − | | | + | | 3 || 6 |
|} | |} | ||
Revision as of 21:09, 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 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 |