Environmental Restoration Group
Ludlum Model 44-40
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: 25 cpm DEAD TIME: 80 microseconds OPERATING VOLTAGE: 900 volts CONSTRUCTION: Painted lead housing* SIZE: 4.5" H x 4" W x 6.5" L (11.4 x 10.2 x 16.5 cm) WEIGHT: 5.5 lb (2.5 kg)

8809 Washington St. NE • Suite 150 Albuquerque, NM 87113 Tel: (505) 298-4224 Fax: (505) 797-1404