Suggested Instruments	General purpose survey meters, ratemeters, and scalers
Detector Type	ZnS(Ag) scintillator
Window	0.8 mg/cm² aluminized polyester
Screen	79% open, stainless steel
Window Area	Active: 17.8 cm² (2.8 in²) Open: 14.1 cm² (2.2 in²)
Efficiency (4π)	²³⁹Pu: 18%
Typical Background (10 µR/hr field)	≤ 3 cpm
Detector Uniformity	within 10% of average reading
Photomultiplier Tube	5.1 cm (2 in.) diameter, magnetically shielded
Operating Voltage	500 to 1200 V (typical)
Connector	Series "C" (others are available)
Construction	Aluminum with beige powder coat
Size (Dia x L)	6.7 x 21.6 cm (2.6 x 8.5 in.)
Weight	4.4 kg (2 lb)

Option	Description	Part Number
Model 180-7	Sample holder for 5.1 cm (2 in.) max. diameter samples.	47-1582