Nuclear Research NP2 Portable REM Reading Neutron Monitor SNOOPY mrem/hr
Battery check performed with batteries in and worked- see photos
Sold without batteries.
From the manufacturer: "SNOOPY PORTABLE NEUTRON MONITOR IGNORES GAMMAS TO GIVE YOU ACCURATE NEUTRON DOSE RATES
NRC's SNOOPY, Model NP-2 is the first truly portable REM reading neutron monitor with dose response corresponding to the human body. This instrument is based on a design by I.O. Anderson and J. Braun', and further work by UCLRL2 The most significant feature of the instrument is a complex moderator/attenuator which gives true REM/hr measurement capability independent of neutron energies in the range of 0.025 ev to 15 mev. The instrument has four accurate linear ranges of 2, 20, 200, and 2000 mrem/hr full scale, and is gamma insensitive up to 500 R/hr. Tests at UCLRL show that the instrument is truly capable of measuring a complèx neutron spectrum rich in intermediate energy neutrons to within +10% of the theoretical ICRP dose rate. The integral construction of the moderator and electronics in the NP-2 yields an instrument which is easily hand-carried for routine neutron surveys by methods typically used with portable survey instruments. In the past, one of the greatest problems in Health Physics has been that of accurate neutron dosimetry, particularly when the neutron dose is large due to intermediate neutrons in the range of 10 ev to 100 Kev. The NP-2 is ideally suited for REM dose measurements near accelerators, reactors, neutron generators, and isotopic neutron sources. It has high sensitivity and accuracy at low dose rates plus the excellent stability characteristics associated with instruments using BF detectors as compared to the drift associated with equipment using photomultipliers and crystals. The instrument consists of a unique moderator/attenuator assembly, BF detector, and associated electronics used to convert the detector pulse output to a meter reading and scaler signal. The neutron dose reading is presented in mrem/hr. The scaler signal is useful if integrated dose information rather than rate is desired and if accurate measurements at very low count rates are required."
