Used Ludlum Model 3 Radiation Survey Meter w/ Pancake G-M probe

  • Model: M3M44-9-used


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Used Ludlum Model 3 Radiation Survey Meter w/ 44-9 Pancake G-M probe
Excellent condition
includes calibration

The Ludlum Model 3 Survey Meter is the industry work horse of radiation survey meters. The meter features a rugged design with microprocessor electronics. With proper care, the Ludlum Model 3 will last decades. It operates on two D cells for approximately 2000 hours. The unit includes adjustable high voltage to 1500 volts and includes external calibration controls. The four counting ranges are x0.1, x1, x10, x100. (Dual scale, mR/hr & cpm available on special request.) Typical Counting Range is from 0 - 200 mR/hr, or 0 - 500,000 cpm. The Model 3 is supplied with built-in speaker, strain relief cable, probe clip-on handle, two D cell batteries and standard factory calibration. This system includes the Model 44-9 pancake G-M probe.

Model 3 specifications:
- 4 Ranges
- Typical Counting Range from 0 - 200 mR/hr, or 0 - 500,000 cpm
- Greater Than 2000 Hour Battery Life
Indicated Use: General purpose survey
Compatible Detectors: G-M, scintillation
Meter Dial: 0 - 2 mR/hr, or 0 - 5k cpm, BAT TEST (others available)
Multipliers: X0.1, X1, X10,X100
Linearity: Reading within ±10% of true value with detector connected
Connector: Series "C" (others available)
Audio: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet)
Calibration Controls: Accessible from front of instrument (protective cover provided)
High Voltage: Adjustable from 200 - 1500 volts
Threshold: 30 mV ± 10 mV
Response: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading RESET: Push-button to zero meter
Power: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible)
Battery Live: Typically greater than 2000 hours with alkaline batteries (battery condition can be checked on meter)
Meter: 2.5" (6.4 cm) arc, 1 mA analog type
Construction: Cast and drawn aluminum with beige polyurethane enamel paint
Temperature Range: -4°F(-20°C) to 122°F(50°C)
May be certified for operation from -40°F(-40°C) to 150°F(65°C)
Size: 6.5" (16.5 cm)H X 3.5" (8.9 cm)W X 8.5" (21.6 cm)L
Weight: 3.5 lbs. (1.6 kg) including batteries

Model 44-9 pancake G-M probe
Indicated Use Alpha, beta, gamma survey; Sample counting
Detector Type Pancake-type, halogen quenched G-M
Window 1.7 ± 0.3 mg/cm2 mica, protected by a stainless steel screen (79% open)
Window Area Active: 15.5 cm2 (2.4 in2)
Open: 12.3 cm2 (1.9 in2)
Efficiency (4π)
14C: 5%
90Sr/90Y: 22%
99Tc: 19%
32P: 32%
239Pu: 15%
99mTc: ≤ 1%
125I: 0.2%
Typical Sensitivity
(137Cs gamma) 3300 cpm per mR/hr
Energy Response Energy dependent (see Energy Response Curve on Graphs tab)
Typical Background
(10 µR/hr field) 60 cpm

This product was added to our catalog on Tuesday 07 November, 2023.


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