neutron detector

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GM pancake detector enclose in lead box.

5 cm diameter GM pancake detector window is exposed.

A 20 cm long 5 cm internal diameter Aluminum tube wrapped in lead feeds into the GM detector window.

A 20 cm length of the tube is filled with paraffin or polyethylene. This is the neutron moderator.

One end surface of the neutron moderator is coated with silver. Vaporization of a silver wire may be used to coat the surface. Silver leafing foil may also be used.

The silver end is place against the GM detector window.