APPLICATION:
Gamma and X-ray radiation exposure survey meter with beta response
RANGE:
0 - 50 R/hr
ENERGY RESPONSE:
+/- 20% of true value from 40 keV - 2 MeV
LINEARITY:
Reading within 10% of true value
RESPONSE TIME:
Approximately 5 seconds for 90% of final meter
deflection on the x1 and x10 scales, and 3 seconds on the x100, x1k and
x10k scales
BETA RESPONSE:
Factor of 4.8 difference between window open and closed measurements
when exposed to a uranium slab
CHAMBER VOLUME:
220 cm³
CHAMBER CONSTRUCTION:
Carbon coated acrylic
SIDE WALL:
1000 mg/cm² aluminum and acrylic
BETA SHIELD:
Retractable 1000 mg/cm² phenolic slide with side
button control
WINDOW:
7 mg/cm² aluminized mylar
WINDOW AREA:
40 cm²
COMPENSATION:
Automatically corrects for temperature and pressure changes in
atmosphere
TEMPERATURE RANGE:
-4° to 122° F (-20° to 50° C). Temperature compensation maintains
calibration within 15% of 25° C reading
PRESSURE COMPENSATION RANGE:
70 kPa to 106 kPa
METER:
2.5” (6.4 cm) arc, 1 mA, pivot-and jewel suspension
METER DIAL:
0 - 5 mR/hr, BAT TEST
CONTROLS:
-
Range Switch: 5 range multipliers x1, x10,
x100, x1k, x10k and instrument off
-
Reset: Pressing the reset button causes the
chamber to discharge
-
Bat Test: Pushbutton used to check battery
capacity
-
Zero Adjust: 1 turn potentiometer to zero
reading
-
Display Light: On/off switch
-
Calibration: Digitally set via USB to serial
computer interface, stored in non-volatile memory
POWER:
2 each “D” cell batteries housed in a sealed externally-accessible
compartment
BATTERY LIFE:
400 hours
CONSTRUCTION:
Cast and drawn aluminum with beige powder-coating
SIZE:
9.2” H x 3.5” W x 8.5” L (23.4 x 8.9 x 21.6 cm) including instrument
handle
WEIGHT:
4.2 lbs (1.9 kg) including batteries
Ludlum Model
9-4 
Features
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