The control package for a general-purpose Eberline, Model PRM-4, pulse-rate radiation monitor. The unit, which measures 21 cm long by 9 cm wide by 19 cm high, consists of a metal box, which houses the battery pack and the electronics package, and a meter and scale adjustments to indicate the count rates. A connection for external earphones is also supplied. The unit could be used with either an internal Geiger-tube or an external scintillation counter The units were manufactured by the Eberline Instrument Corporation in Santa Fe, New Mexico and the units were used by the Atomic Energy Control Board to investigate the contamination in tailings in the Port Hope, ON, area.
