Difference between revisions of "Neutron Time of Flight 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. | + | 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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|no blocks | |no blocks | ||
|background | |background | ||
| − | |background with detector shielded | + | |background with detector shielded with 4" poly |
|- | |- | ||
|test 1 counts | |test 1 counts | ||
Revision as of 14:50, 19 September 2008
Determining Neutron Time of Flight
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 block (4") | 2 blocks (8") | 3 blocks (12") | 4 blocks (16") | no blocks | 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 |