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Model 43-68

Alpha-Beta Detector

Indicated Use	Alpha-beta survey
Detector Type	Rechargable gas proportional
Recommended Counting Gas	P-10 (10% methane, 90% argon)
Gas Recharge	Will operate on static charge for at least 15 hours with 1 m (39 in.) cable; 5-hour static charge if connected to a simultaneous alpha/beta measuring instrument
Window	0.8 mg/cm² metalized polyester (other thicknesses available)
Window Area	Active: 126 cm² (19.5 in²) Open: 100 cm² (15.6 in²)
Efficiency (4π)	²³⁹Pu: 20% ¹⁴C: 15% ⁹⁹Tc: 30% ⁹⁰Sr/⁹⁰Y: 20% Gamma: < 1%
Simultaneous Alpha-Beta Counting	²³⁹Pu: 17.5% ⁹⁹Tc: 20% ⁹⁰Sr/⁹⁰Y: 20%
Typical Background (10 µR/hr field)	Alpha: ≤ 3 cpm when operating at alpha-only plateau region Beta-Gamma: 350 cpm
Operating Voltage	Alpha: 1100 to 1400 V (typical) Beta-Gamma: 1600 to 1800 V (typical)
Counter Threshold Setting	2 to 5 mV (typical)
Gas Connectors	double-end quick disconnect
Size (H x W x L)	10 x 11.7 x 19.8 cm (3.9 x 4.6 x 7.8 in.) with handle
Weight	0.9 kg (2 lb)

Model	Description	Part Number
Model 3002	Digital Survey Meter For alpha-beta counting Stores up to 1000 data points	48-4037
Model 12	Analog Survey Meter	48-1609
Model 16	Analog Survey Meter Adjustable window	48-1612
Model 18	Analog Survey Meter Adjustable window 3 detector setups	48-1613
Model 2000	Scaler Scaler Range: 0 to 999,999 counts Timer: 0 to 999 minutes	48-1648
Model 2200	Scaler-Ratemeter Scaler Range: 0 to 999,999 counts Ratemeter Range: 0 to 500,000 cpm Timer: 0 to 999 minutes Adjustable window	48-1651
Model 2221	Analog Scaler-Ratemeter with Digital LCD Single channel analysis	48-2065
Model 2224-1	Analog Scaler-Ratemeter with Digital LCD Simultaneous alpha-beta counting	48-2679
Model 2241-2	Digital Scaler-Ratemeter Auto-ranging RS-232 port 2 detector setups	48-2731
Model 2350-1	Digital Datalogging Meter Stores 1000 data points Supports 16 detector setups	48-2751
Model 2360	Analog Datalogging Meter with Digital Scaler LCD Simultaneous alpha-beta measurements Stores 550 data points	48-2872

Description	Part Number
Window Assembly	4342-097
Electrode Wire	21-9741
Quick Disconnect Gas Fittings for Gas Proportional Detectors - Hose End	13-7912
Quick Disconnect Gas Fittings for Gas Proportional Detectors - Probe End	13-7920
Protective Screen	7342-157