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Ludlum 3 geiger counter radiation detector


A nice clean instrument with a highly sensitive scintillator probe.
Meter dial is a 202-560 0-5.4 K C.P.M., 0-2 mR/hr and battery check.
Decade selector X0.1, X1, X10, and X100 with batt and off position.
Response fast 4 seconds,slow 22 seconds.
Threshold 30 mv +-10%. High voltage 400-1,500 volts regulated and adjustable
Push button meter reset to 0 or discharge reading.
Audio on off and delivers greater than 60db at 2 feet using a unimorph speaker.
Pulse count calibrated per manufactures specification.
The Ludlum 3 was completly refurbished and has some scratches and blemishes but looks good.
The probe is a Bicron 1.5 X 2.5 inch NAI (T1) scintillation detector. GAMMA, Bremsstrahlung X-RAY, and X-RAY sensitive.
Photo 9 is background,10 is with source near ,11 is at 12 inches,and 12 is close to contact.Will detect a 10 uCi Cs 137 test disc at six feet.
The yellow caplug cover is to reduce bumps and dents to the thin aluminum crystal enclosure. (there are no bumps,or dings on the probe)
Includes new batteries and test source



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