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Model 30-4

Model 30-4, manufactured by Ludlum Measurement Inc., is a portable neutron detector consisting of a digital ratemeter (Model 30) with a 22.9 cm diameter cadmium-loaded polyethylene moderating sphere containing a 3He detector.

The instrument can detect neutrons from the energy of thermals up to 12 MeV and applies an inverse RPG curve for neutrons of energy up to 7 MeV.

Using the display unit, it is possible to select 3 measurement modes (RATE, COUNT and MAX) and the unit of measurement between cps, cpm, rem/hr, or Sv/h.

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