Neutron Meters

22.9 cm (9 in.) REM Ball
 Model 12-4 Neutron Dose Ratemeter

The Model 12-4 is an industry standard neutron dose rate instrument that conforms to the RPG curve with a measuring range of 0–100 Sv/h (0–10,000 mrem/hr) from thermal to 12 MeV. A moderated 3He tube in a 22.9 cm (9.0 in.) cadmium loaded polyethylene sphere.

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