June, 7, 2007 Cf rate measurements using Photonics PMT

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Cf source was placed 16.5 cm away from face of PHotonics PMT. The PMT output signal was descriminated by a Lecroy Model 821 descriminator set to pass any voltage below -0.5 mV. The descriminated output was then sent to a counter Model TC 531.


Configuration Definitions

1: Placed the Cf source 16.5 cm from face of Scintillator. neutrons passing through scintillator would also pass through PMT

2: Inserted a 2.5 cm thick steel shielding wall between Scintillator and Cf source. Right up against Scintillator

3: Replaced steel wall with 5 cm thick lead shielding brick

4: Replaced lead brick with 6.7 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 13.4 cm

6: No source backround

Configuration Rate (counts/min) Statistical Error in Rate (Counts/min)
1 2.7e3 0.09e3
2 2.2e3 0.01e3
3 0.8e3 0.02e3
4 2.2e3 0.08e3
5 1.8e3 0.02e3
6
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