Ludlum Model 19 Micro R Meter

Ludlum Measurements Model 19 MicroR Meter

The Ludlum Model 19 MicroR survey meter is used for low level micro R gamma survey. It is a compact, rugged, internal scintillation detector survey meter. The Model 19 Micro R survey meter includes an internal 1"x1" NaI detector, five ranges and splash proof shields for outdoor use. No external detector is required. Sensitivity, based on Cs-137 gamma, is typically 175 cpm/microR/hr. This meter over-responds to scatter and low energy gamma which makes it more sensitive than any survey meter available. Range selections include 0 - 25, 0 - 50, 0 - 250, 0 - 500, 0 - 5000 micro R/hr.

WORKING ENVIRONMENT: Splash proof shields for outdoor use
INDICATED USE: Low level (microR) gamma survey
DETECTOR: 1" X 1" sodium iodide (NaI)Tl scintillator
SENSITIVITY: Typically 175 cpm/microR/hr (137Cs gamma )
ENERGY RESPONSE: Energy dependent
METER DIAL:0 - 25 microR/hr, 0 - 50 microR/hr, BAT TEST
RANGE SELECTIONS: 0 - 25, 0 - 50, 0 - 250, 0 - 500, 0 - 5000 microR/hr
LIGHT: Push-button to activate
LINEARITY: Reading within plus or minus 10% of true value
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)
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 600 hours with alkaline batteries (battery condition can be checked on meter)
METER: 2.5" (6.4cm) 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: 7.8"(19.8 cm)H X 3.5"(8.9 cm)W X 8.5"(21.6 cm)L
WEIGHT: 4.5 lbs(2.1 kg) including batteries

Common Meter Dial


202-016 0 - 50 mR/hr; 0 - 25 mR/hr	202-702 0 - 0.5 mSv/h; 0 - 0.25 mSv/h

Accessories	Replacement Parts
Check Source Headset Standard Carrying Case Air and Water Tight Carrying Case	Meter Bezel Meter Movement Handle Detector Assembly

Manual ANSI Test Report Ludlum Model 19 Response Curve