Alpha/Beta Detector - Model 43-89
Specifications

DETECTOR: scintillator, ZnS (Ag) deposited on a 0.025 cm (0.010 in.) rectangular plastic scintillator
PHOTOMULTIPLIER TUBE: 3.8 cm (1.5 in.) diameter
OPERATING VOLTAGE: 500-1000 volts (1500 maximum)
WINDOW: 1.2 mg/cm² metalized polyester
WINDOW AREA:
open area: approximately (15.5 in²) 100 cm²
active area: approximately 125 cm² (19.4 in²)
PROTECTOR SCREEN: 22 ga (0.076 cm [0.030 in.]) stainless steel hex (0.64 cm [0.25 in.]), 79% open
RESPONSE UNIFORMITY: ±10% from average reading
EFFICIENCY (4π): 20% for 239Pu, 10% for 99Tc and 20% for 90Sr 90Y
GAMMA SENSITIVITY: approximately 20 cpm/µR/hr
TYPICAL BACKGROUND:
alpha: 3 cpm or less
beta: 300 cpm or less
CROSSTALK:
alpha to beta: 10% or less
beta to alpha: 1% or less
TEMPERATURE RANGE: -20 to 50 ºC (-4 to 122 °F)
CONSTRUCTION: aluminum with beige powder coating
CONNECTOR: series “C,” unless specified otherwise
SIZE: 33 x 10 x 10 cm (12.25 x 4 x 4 in.) (L x W x H)
WEIGHT: 0.68 kg (1.5 lbs)