Environmental Restoration Group

Ludlum Model 44-3
Ludlum Specifications
INDICATED USE: 125I and low energy gamma survey
ENERGY RESPONSE: Energy dependent
SUGGESTED INSTRUMENTS: General purpose survey meters, ratemeters, and scalers
OPERATING VOLTAGE: Typically 500 - 1200 volts
SCINTILLATOR: 1" (2.5 cm) diameter 1 mm thick Nal(TI) crystal
ENTRY WINDOW: 18.4 mg/cm2
WINDOW AREA: 5 cm2 active and open
BACKGROUND (10 R/hr): 300 cpm
EFFICIENCY (4pi): 19% - 129I
SENSITIVITY: 675 cpm/R/hr (125I)
RECOMMENDED ENERGY RANGE: 10 - 60 keV
PHOTOMULTIPLIER TUBE: 1.5" (3.8 cm) diameter
SIZE: 2" diameter x 7" L (5.1 X 17.8 cm)
WEIGHT: 1 lb. (0.5 kg)
8809 Washington St. NE Suite 150
Albuquerque, NM 87113
Tel: (505) 298-4224
Fax: (505) 797-1404