Difference between revisions of "Neutron Time of Flight Test"

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=Determining Neutron Time of Flight=
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==Verifying Neutron Detection==
  
 
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This test included one detector and a collimated Cf-252 source.  The detector was placed 16 inches away from the source collimator.  Tests were performed with various thicknesses of poly in between the two. Each count was 5 minutes long and three counts were taken for each test.   
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This test included one detector and a collimated Cf-252 source.  The detector was placed 16 inches away from the source collimator.  Tests were performed with various thicknesses of poly in between the two. Each count was 5 minutes long and three counts were taken for each test.  Detector D was used at 1618 volts through channel 3 of LeCroy power supply and a threshold of 77mV set through the blue faced CFD.   
  
 
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|setup
 
|setup
|1 block (4")
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|1 poly block (4")
|2 blocks (8")
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|2 poly blocks (8")
|3 blocks (12")
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|3 ply blocks (12")
|4 blocks (16")
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|4 poly blocks (16")
|no blocks
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|no poly
 
|background
 
|background
|background with detector shielded
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|background with detector shielded with 4" poly
 
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|-
 
|test 1 counts
 
|test 1 counts
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|1334
 
|1334
 
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==Test for Time of Flight==
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A test was performed using a Cf-252 source and two plastic scintillator detectors.  The two detectors were placed in parallel with the source.  The idea was that the source would emit a neutron and that neutron would hit the first detector and then the second.  The signals from the detectors would show up on the oscilloscope being spaced a certain measurable distance/time apart.  This was acquired by gating the signal.
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Latest revision as of 06:22, 5 February 2009

Verifying Neutron Detection


This test included one detector and a collimated Cf-252 source. The detector was placed 16 inches away from the source collimator. Tests were performed with various thicknesses of poly in between the two. Each count was 5 minutes long and three counts were taken for each test. Detector D was used at 1618 volts through channel 3 of LeCroy power supply and a threshold of 77mV set through the blue faced CFD.


setup 1 poly block (4") 2 poly blocks (8") 3 ply blocks (12") 4 poly blocks (16") no poly background background with detector shielded with 4" poly
test 1 counts 7180 5142 3945 3235 11793 1620 1314
test 2 counts 7291 5213 3994 3084 11694 1648 1336
test 3 counts 7319 5205 4014 3150 11872 1629 1352
averages 7263 5187 3984 3156 11786 1632 1334

Test for Time of Flight

A test was performed using a Cf-252 source and two plastic scintillator detectors. The two detectors were placed in parallel with the source. The idea was that the source would emit a neutron and that neutron would hit the first detector and then the second. The signals from the detectors would show up on the oscilloscope being spaced a certain measurable distance/time apart. This was acquired by gating the signal.

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