Ludlum Model 44-9
Alpha, Beta, Gamma GM Detector
Part Number 47-1539
Introduction
The Model 44-9's GM 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.
Other Similar Models
Model 44-40: Utilizes a lead housing to reduce background
Model 44-9-18: Incorporates a gooseneck type flexible end with an extension handle stretching to 36" in length
Specifications
INDICATED USE: Alpha, beta, gamma survey; sample counting
DETECTOR: Pancake type halogen quenched GM
WINDOW: 1.7 + 0.3 mg/cm2 mica
WINDOW AREA: 15 cm2 active, 12 cm2 open
EFFICIENCY (4pi): 5%-14C; 22%-90Sr/90Y; 19%-99Tc; < 1%-99mTc, 32%-32P; 15%-239Pu
SENSITIVITY (137Cs gamma): 3300 cpm/mR/hr
ENERGY RESPONSE: Energy dependant
BACKGROUND: 60 cpm
DEAD TIME: 80 microseconds
OPERATING VOLTAGE: 900 volts
CONSTRUCTION: Painted aluminum housing
SIZE: 1.8" H x 2.7" W x 10.7" L (4.6 x 6.9 x 27.2 cm)
WEIGHT: 1 lb (0.5 kg)
Click Here to Download a Printable Information Sheet. (.pdf format)
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