Atomic Research Corporation Model 231 Geiger Mueller Survey Meter (ca. 1955 - 1960)
This is an example of
the Model 231 Geiger counter produced by Atomic Research Corporation (ARC)
Since ARC was headquartered in Colorado, it should come as no surprise that the instrument was primarily intended for uranium prospecting.
Donated by Ron
Atomic Research Corporation's detectors were similar in design to RCA's survey meters. The reason is that Atomic Research actually manufactured RCAs instruments for them! The curious similarity of their names (RCA vs. ARC) seems to have been a coincidence.
Detector: Four Victoreen 6306 thin walled GM tubes with bismuth cathode: one tube in external probe and the other three inside the case (see photograph to left). An optional 30” “walking stick” was available.
Range: 0 – 200, 0 – 2000, 0 – 20,000 cpm
0 – 0.03, 0 – 0.3 and 0 – 3.0 mR/h
no speaker but has jack for headphones
3.5” x 4.5” x 7.75”
Weight: 4 pounds
Batteries: two 1.5 volt and two 45 volt
Fred Zobel. Personal communication.
Atomic Research Operating Instructions for “Raytomic” ARC 2 Series, no date.
Copyright 1999, Oak Ridge Associated Universities