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Detector 1: Halogen-quenched “pancake” Geiger-Mueller tube (LND 73126). Effective diameter 1.75″ (45 mm). Mica window density 1.5-2.0 mg/cm2
Gamma Sensitivity: 3500 CPM/mR/hr referenced to Cs-137
Beta Efficiency (for 4Π at contact):
14C: 49 keV avg., 156 keV max., 5.3%
210Bi: 390 keV avg., 1.2 MeV max., 32%
90Sr: 546 keV avg., 2.3 MeV max, 38%
32P: 693 keV avg., 1.7 MeV max., 33%
Measurement Range: 0 to 5 mR/hr or 0 to 18,000 CPM calibration check, typical maximum 10 mR/hr or 35,000 CPM
Window Shield: NCR2/2 Mylar laminated to a copper beryllium screen
Detector 2: Halogen-quenched energy compensated Geiger-Mueller tube (LND 7128). Effective diameter .36″ (9.1 mm)
Gamma Sensitivity: 1000 CPM/mR/hr referenced to Cs-137
Measurement Range: 0 to 5 mR/hr calibration check, typical maximum 10 mR/hr or 10,000 CPM
Temperature Range: -40° to 75°C (-40° to 167°F)
Power Requirement: 3.5 to 15 V DC
Current Drain: <1 mA (typical) at background radiation levels, to 25 mA (max) @ 12 V DC in high fields.
Lightning Surge Protection: to 600 W for 1 ms
ESD Protection: up to 16 kV
Size (L x W x H): 6.25″ x 3.15″ x 2.35″ (157 mm x 78 mm x 60 mm). Connector adds 0.6″ to length.
L-Bracket: 6.25″ x 3.25″ x 2.25″ (157 mm x 83 mm x 57 mm). Thickness 0.1″ (2.54 mm).
Probe Weight: 21.1 oz. (599 gr.) With Bracket: 25.6 oz. (726 gr.)
Probe Housing: Anodized aluminum and polycarbonate. Designed for outdoor use.
Cable: Waterproof. RFI-shielded. UV-resistant jacket. 10 meter length.
Connector: M12 Euro. Waterproof. RFI-shielded.
Computer Interface: Optional cable with RS-232 or USB 2.0 interface.
