Neutron detection via Indium Foil

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For neutron detection, a pre-calibrated Indium foil was suspended in the calorimeter water in line with the level of the reactor. Nearing the end of the experiment, this was removed, dried and placed between two Geiger counters, one set to read low counts, the other high counts per second. In the calibration, these to count rates were equivalent. If during the experiment, Neutrons had activated the Indium, the count rates would change. They did not. In this video you can see the Indium foil immediately after its removal from the reactor being dried and placed between the two Geiger counters which is attached to the computer that monitors them on channel 1 & 2. The computer also monitors the power meters 1125 joule pulses on channel five.