Ludlum Model 14C Survey Meter

for Nuclear Medicine Applications

The Ludlum Model 14C survey meter was designed to meet nuclear medicine requirements. The Model 14C is similar to the Model 3, but with an internal energy compensated G-M detector. It can be used with one or more external GM or scintillation detectors for alpha, beta, or gamma detection up to 0-200 mR/hr.  This additional internal detector creates fifth high range of 0-2000 mR/hr in addition to the four ranges covered by the external probe.  It is used in hosptials, universities, power plants and regulatory facilities. Standard scale is 0-2 mR/hr with five counting ranges: x0.1, x1, x10, x100, and x1000. (Dual scale cpm & mR/hr are available on request). Two “D” cells provide over 200 hours of operation. The Model 14C is supplied as shown with built-in speaker. 

Digital versions of this type of survey meter are also available.

Ludlum 14C Specifications

Compatible Detectors: G-M, scintillation
Meter Dial:Typically 0 - 2 mR/hr and cpm, BAT TEST (others available )
Multipliers: X0.1, X1, X10, X100, X1000
Linearity: Reading within plus or minus 10% of true value with detector connected
Connector: Series "C" (others available )
Internal Detector: Energy compensated G-M (used with X1000 scale only)
Energy Response: Within plus or minus 15% of true value between 60 keV - 3 MeV (internal detector only )
Threshold: 30 mV plus or minus 10 mV
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:900 volts
Threshold: 30 mV plus or minus 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 Life: Typically greater than 1000 hrs.(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
°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

Note that the Ludlum Model 14C Survey Meter houses an internal energy-compensated G-M detector with limitations listed in the description. External suggested detectors are listed below and are not included with the survey meter price. An additional charge will be added for each detector ordered.  

Ludlum Model 14C Manual        Ludlum Model 14c Response Curve

Recommended external probes for the Ludlum Model 14C: Model 44-7, 44-9, 44-38, 44-2, 44-3, and others.

Ludlum Model 14C Common Meter dials:

0 - 5k cpm; 0-2 mR/hr
For Any Detector

0-6.6k cpm; 0-2 mR/hr
For Model 44-9; 44-9-18;
44-40; 44-88; 44-89; 44-94

0-6.6k cpm; 0-20
For Model 44-9; 44-9-18;
44-40; 44-88; 44-89; 44-94


 DS 051-014 Model 14C Survey Meter  
 DS 051-014-7 Model 14C Survey Meter with Model 44-7 probe  
 DS 051-014-9 Model 14C Survey Meter w/ Model 44-9 probe  
 DS 051-014-3/9 Model 14C Survey Meter w/ 44-9 and 44-3 NaI probe  


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