LUDLUM M-3 SURVEY METER W/44-2
The Model 3 is a portable radiation survey instrument with four linear ranges used in combination with exposure rate, or cpm meter dials.
The instrument features a regulated high-voltage power supply, unimorph speaker with audio ON/OFF capability, fast-slow meter response, meter reset button and six-position switch for selecting battery check or scale multiples of Xo.1,X1,X10 and X100.
Each range multiplier has its own calibration potentiometer.
Gamma Radiation survey.
NIST-traceable certificate of calibration.
|Scintillator||1\" diameter x 1\" thick sodium iodide|
|Range||60 keV to 1.25 MeV|
|Sensitivity||Typically 175 cpm/ µR/ hr (137 Cs gamma)|
|Operating Voltage||500 to 1200 volts|
|Dimensions||2\" diameter x 7.3\" long|
|Multipliers||Xo.1 X1 X10 X100|
|Audio||Built-in unimorph speaker with ON/OFF switch (greater tha 60dB at 2 feet)|
|Threshold||Fixed at 30 mV +/-10 mV|
|Response||Fast (4 seconds) or Slow (22 seconds) from 10 to 8=90% of final reading.|
|Dimensions||6.5 x 8.5\" x 3.5\"\"||16.5 x 21.6 x 8.9 cm|
|Weight||3 lbs||1.36 kg|