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Model 43-135-1

Large Area 2π Proportional Detector

Part Number: 47-4117

The Ludlum Model 43-135-1 is a large-area, 2π proportional detector designed for calibrating large-area alpha and beta sources. The windowless detector and source tray are sealed together via heavy duty clamps, which permit operating at higher pressures (up to 0.2 MPa).

Specifications

Typical Background (10 µR/hr field)	Alpha: 0.06 cps Beta: 30 cps
Detector Uniform Response	± 1% within the active area
Efficiencies (4π)	²³⁹Pu: 42% ²³⁰Th: 33% ⁹⁹Tc: 55% ⁶³Ni: 37% ⁹⁰Sr/⁹⁰Y: 55% Efficiencies determined using sources with nickel or stainless steel electroplated backing.
Anode Wire	0.025 mm (0.001 in.) platinum on 25-mm (1-in.) spacing, mounted on Teflon insulated posts
Distance from Sample to Anode Wire	6 mm (0.25 in.)
Operating Voltage	Less than 2500 VDC
Plateau Length	> 200 volts with a slope of approximately 1%
Detector Connector	Hermetically sealed MHV connector
Detector Assembly Seal	Viton O-ring
Counter Threshold	Typically -5 mV for gross counting instrument
Working Pressure	4 to 30 PSI (27 to 207 kPa)
Maximum Pressure	45 PSIA (310.3 kPa)
Equipped With	Inlet and outlet for counting gas Pressure relief valve for over pressure protection Pressure gauge (0 to 30 PSI, 0 to 200 kPa, two inch dial)
Size (H x W x L)	18.3 x 43.2 x 53.3 cm (7.2 x 17 x 21 in.)
Max. Source Size (H x W x L)	1.3 x 29 x 34.9 cm (0.5 x 8.25 x 13.75 in.)
Weight	approximately 37.2 kg (82 lb)

Options

Option	Description	Part Number
Model 2750	Gas flow control box	48-2146
2-Stage Gas Regulator	Gas regulator	2310017
Model T-1031	Gas flow time control	48-2472