Indicated Use	¹²⁵I and low-energy gamma survey
Detector Type	NaI(Tl) scintillator, 2.5 cm (1 in) dia. x 0.1 cm (0.04 in) thick
Window	18.4 mg/cm²
Window Area	Active: 5 cm² (0.8 in²) Open: 5 cm² (0.8 in²)
Efficiency (4π)	¹²⁵I: 33.5% (derived from ¹²⁹I efficiency) ¹²⁹I: 18%
Typical Sensitivity (¹²⁵I)	675 cpm per µR/hr
Typical Background (10 µR/hr field)	300 cpm
Recommended Energy Range	10 to 60 keV
Energy Response	Energy dependent (see Energy Response Curve)
Photomultiplier Tube	3.8 cm (1.5 in) diameter
Operating Voltage	500 to 1200 V (typical)
Connector	Series "C"
Construction	Aluminum housing with beige powder coat
Size (D x L)	5.1 x 17.8 cm (2 x 7 in)
Weight	0.5 kg (1 lb)

Option	Description	Part Number
Model 180-1	Sample holder for 5.1 cm (2 in.) max. diameter samples.	47-1675
Model 180-1L	Sample holder with lead shielding for 5.1 cm (2 in.) max. diameter samples.	47-2988
Model 180-24	Sample holder for 5.1 cm (2 in.) max. diameter samples.	47-2631
Detector Collimators	Lead collimators.	Various.
Sample Planchets	Set of 500 aluminum or stainless steel sample planchets.	Depends on material.

Description	Part Number
Window Assembly	4002-380
Mylar Window	2002-379
NaI(Tl) Scintillator	2002-361
1.5 in. PMT, Non-Based with Voltage Divider	4002-510
Red Protective Cap	03-5475

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