Environmental Restoration Group

Ludlum Model 44-9
Ludlum 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; 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)
8809 Washington St. NE Suite 150
Albuquerque, NM 87113
Tel: (505) 298-4224
Fax: (505) 797-1404