Ludlum Model 9
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Ion Chamber
- 4 Ranges
- Retractable Beta Shield
0 – 5000 mR/hr- Built in audio
Indicated Use: General purpose survey
Chamber Construction: Carbon coated acrylic
Chamber Volume: 220 cm³
Window: 7 mg/cm² aluminized mylar
Window Area: Active – 40 cm²
Open – 30 cm²
Beta Shield: Retractable 300 mg/cm² phenolic slide
Energy Response: Within plus or minus 20% of true value from 10 keV – 2 MeV
Beta Factor: 5.4 with uranium slab
Audio: Built in unimorph speaker with ON/OFF switch
Meter Dial: 0 – 5 mR/hr, BAT TEST
Multipliers: X1, X10, X100, X1000
Linearity: Reading within plus or minus 10% of true value
Calibration Controls: Accessible from front of instrument (protective cover provided)
Response: Typically 3 seconds from 10% to 90% of final reading
Reset: Push-button to discharge chamber and zero meter
Zero Adjust: 3 turn potentiometer
Warm-up Time: Approximately 5 minutes
Power: 2 each “D” cell batteries (housed in sealed compartment that is accessible from front of instrument)
Battery Life: Greater than 200 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: 8”(20.3 cm)H X 3.5”(8.9 cm)W X 8.5”(21.6 cm)L
Weight: 4 lbs (1.8 kg) including batteries
Visit Atlantic Nuclear online.
Common Meter Dial