Indicated Use	Tritium surface survey / Windowless beta survey. Designed to be placed on a flat surface and then purged with P-10 gas for 20 seconds before counting.
Detector Type	Gas flow proportional
Window	Windowless
Window Area	Active: 126 cm² (19.5 in²) Open: 100 cm² (15.5 in²)
Efficiency (4π)	³H: 25%
Typical Background (10 µR/hr field)	400 cpm
Operating Voltage	1700 V (typical)
Connector	Series "C" (others available)
Size (H x W x L)	12.4 x 11.7 x 22.9 cm (4.9 x 4.6 x 9 in)
Weight	0.9 kg (2 lb)

Description	Part Number
Protective Screen	7342-144

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