LUDLUM Model 6 Gamma Exposure Ratemeter

This general purpose, handheld analog ratemeter supports operating two separate radiation detectors. A switch allows the user to select between the internally mounted GM detector with an exposure range of 0–20 mSv/h (0–2000 mR/hr) or an external GM or scintillator detector of choice (see table below).

The aluminum cast instrument housing, with its separate battery compartment and accompanying metal handle, offer an industrial robustness and quality that promote long-lasting protection and instrument life. The front-panel controls include a rotary switch for selecting the five-decade range and instrument shut-off, an audio on/off switch, a fast/slow response switch, a high voltage display button, and a battery test button.
 
The analog meter face comes in a variety of options to support the measurement units and ranges for the additional external detector selected. A one meter (39 in.) straight type detector cable with "C" style connector is included in the price of the instrument.

The Model 6 is a gamma exposure ratemeter equipped with an internally housed, energy compensated GM detector that measures over the range of 0-10 Sv/ h ( 0-1000 mR/ hr) . The cast aluminum instrument housing with its separate battery compartment and accompanying metal handle offer an industrial robustness and quality that promote long lasting protection and instrument life. The front panel offers a single rotary switch for selecting the three-decade range, instrument shut-off, and battery test. The Model 6 is a complete turn-key system and includes two " D" cell batteries.

INDICATED USE: Radiographers survey
WORKING ENVIRONMENT: Splashproof shields for outdoor use
DETECTORS: Internal energy compensated G-M tube
ENERGY RESPONSE: Within plus or minus 15% of true value from 60 keV - 3 MeV
SATURATION: In excess of 1000 R/ hr
METER DIAL: 0 - 10 mR/ hr, BAT TEST ( others available) 
MULTIPLIERS: X1, X10, X100
LINEARITY: Reading within plus or minus 10% of true value with detector connected
CALIBRATION CONTROLS: All controls are internal
POWER: 2 each " D" cell batteries ( housed in sealed compartment that is externally accessible ) 
BATTERY LIFE: Typically 600 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: 9.5" ( 24.1cm) H X 3.5" ( 8.9cm) W X 8.5" ( 21.6cm) L
WEIGHT: 4.4 lbs ( 2 kg) including batteries and detector