Model 3030 & 3030E Series Technical Manual Section 3
Ludlum Measurements, Inc. Page 6 November 2017
Specifications
Detector: ZnS(Ag) adhered to a plastic scintillation material
Tube: 5.1 cm (2 in.) diameter, magnetically shielded photomultiplier
Window: 0.4 mg/cm
2
aluminized Mylar
Active and Open Area: 20.3 cm
2
Sample Holder: brass housing with chrome-plated brass sample tray,
capable of holding 2.5 or 5.1-centimeter (one or two-inch) diameter samples,
up to 1 cm (0.4 in.) thick
Shielding Thickness: 19 mm (0.75 in.)
Efficiency (4π geometry):
Alpha: 32% for
230
Th; 39% for
238
U; 37% for
239
Pu
Beta: 8% for
14
C; 27% for
99
Tc; 29% for
137
Cs; 26% for
90
Sr/
90
Y
Background:
Alpha: 3 cpm or less
Beta Gamma: 50 cpm or less (10 µR/hr field)
Size: 29.2 x 19.1 x 26.7 cm (11.5 x 7.5 x 10.5 in.) (H x W x D)
Weight: 13.2 kg (29 lb)
Finish: gray powder coating with subsurface-printed membrane front panel
Counter Connector: series “C” for connection to an external counter
Size: 24.1 x 13.5 x 25.4 cm (9.5 x 5.3 x 10.0 in) (H x W x D)
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