Neutron Dose Ratemeter - Model 12-4
CE Seal
Introduction

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.
 
The detector is a 22.9 cm (9 in.), moderated ³He tube with a gamma background rejection up to 100 mSv/h (10 R/hr). The ratemeter is a four-decade analog meter, designed with an aluminum cast instrument housing incorporating a separate battery compartment, and accompanying metal handle. This design delivers industrial robustness and quality, promoting long-lasting protection and instrument life.
 
The front-panel controls include a rotary switch for selecting the four-decade range, instrument shut-off, and battery test, an audio on/off switch, a fast/slow response switch, a count reset, and high-voltage test push-button. The Model 12-4 is a complete turn-key system and includes two "D" cell batteries.