Neutron Time of Flight Test

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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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