 Ludlum Model
44-9
Alpha Beta Gamma Radiation
Pancake G-M Detector
 Introduction
The Ludlum Model 44-9 Alpha Beta Gamma Radiation G-M
pancake type detector is arguably the most popular radiation detector used
throughout the world. This detector is sensitive to alpha beta and gamma
radiation, is enclosed within a rugged metal enclosure, and is conveniently
shaped and sized for checking contamination on people and objects.
This detector operates between 85 to 1000 volts and is compatible with any
Ludlum instrument capable of supplying 900 VDC and an input sensitivity of
30 mV or higher.
Specifications
PART NUMBER: 47-1539
INDICATED USE: Alpha
beta gamma radiation survey; Frisking
RADIATION DETECTOR: Pancake type halogen quenched G-M
WINDOW: 1.7 ± 0.3 mg/cm² mica
WINDOW AREA:
Active - 15 cm²
Open - 12 cm²
EFFICIENCY(4pi geometry): Typically 5%-14C;
22%-90Sr/90Y;
19%-99Tc; 32%-32P;
15%-239Pu
SENSITIVITY: Typically 3300 cpm/mR/hr (137Cs
gamma )
ENERGY RESPONSE: Energy dependent
DEAD TIME: Typically 80 microseconds
COMPATIBLE INSTRUMENTS: General purpose radiation survey meters, ratemeters, and
scalers
OPERATING VOLTAGE: 900 volts
CONNECTOR: Series "C"
(others available)
CONSTRUCTION: Aluminum housing 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: 1.8" (4.6 cm) H X 2.7" (6.9 cm) W X 10.7" (27.2 cm) L
WEIGHT: 1 lb (0.5kg)
 This Product is CE Certified
Energy Compensation Filters
 
Replacement Parts
-
Pancake G-M Tube (Part
Number: 01-5008)
-
Protective Screen (Part
Number: 21-9586)
-
Grip (Part Number: 7002-426)
-
Molded Protective Cover (Part Number: 7002-1037)
Technical Information
Alternate Detectors
Other Ludlum Products
Ludlum Information
For more information or to request a quotation,
please contact us
by phone at: (865)
947-5123 or by email at:
sales@deqtech.com.
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