Windowless Sample Counter Detector - Model 44-110-4
Specifications

INDICATED USE: low-energy alpha and beta sample counting.
DETECTOR: windowless gas flow proportional.
GAS FLOW: typically 0.1 L/min, detector equipped with 3.2mm(0.125in.) hose fittings and two position switch flow valve.
PURGE TIME: 60 seconds at gas flow of 0.1 L/min (100 cc/min), shorter times at higher gas flow.
EFFICIENCY (4π): 12%-63Ni, 34%-239Pu
BACKGROUND: ~ 300 cpm in beta mode, OPERATING VOLTAGE: typically 1700 to 1900 Vdc.
SAMPLE HOLDER: anodized aluminum tray with 2.5 cm (1.0 in.) diameter sample ring to allow for 2.5 or 5.1 cm (1.0 or 2.0 in.) diameter samples.
SAMPLE SIZE (maximum): 5.1 x 0.9 cm (2.0 x 0.4 in.) (Dia x Depth).
COMPATIBLE INSTRUMENTS: Model 2200
CONNECTOR: Series "C".
CONSTRUCTION: aluminum housing.
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
SIZE: 15.2 x 11.4 x 23.6 cm (6 x 4.5 x 9.3 in.) (H x W x L)
WEIGHT: 1.5 kg (3.3 lb)