Model 2612
Geiger Counter
Nuclear Instrument & Chemical Corporation
Model 2612
0 - 60,000 Counts Per Minute / 0 - 20 mR per hour over 3 scales.
Uses (2) 67½ Volt Eveready type 467 Batteries & (2) 1½ Volt type W-353 batteries.
Serial Number 539
10" Long x 5" Wide x 9" Tall (with probe)
This unit is complete but I have no batteries to test it.
Headphones plug into a standard ¼" jack The end window Geiger Mueller probe uses a
PL-259 Connector.
Left & Right Side Views
Case is aluminum and the probe holder is cast aluminum
Close-up of Meter Face and Logo
Note the "approximate" on the meter face.
Left & Right Inside Views
The Power supply is loose in the battery area on the bottom.
Control Panel
The headphone uses a ¼" jack, the calibration pot is located under the cover on right.
Schematic & Battery Placement Sheets.
Geiger Mueller Probe
This is a mica end window Geiger Mueller probe that operates at 900 volts.
The probe & GM tube are 6½" long, and connects to the Geiger counter with a PL-259 connector.
Nuclear Chicago Probe: Type 779070 - Serial Number 66-49