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800-620-8803 
This instrument combines Ludlum’s Model 2929 Dual Channel Scaler with its Model 43-10-1 Sample Counting Head to create an alpha/beta sample counter. The Model 2929 is a dual-channel scaler incorporating a pulse height analyzer that provides alpha beta separation and displays the counts for each on dedicated six-digit LED readouts.
The Model 43-10-1 sample counting head is a scintillator/zinc sulfide phoswitch with a sample tray accommodating up to a 5.1 cm (2 in.) diameter filter or planchet. The system comes complete with interconnecting cable and with the detector/sample tray joined to the scaler instrument to facilitate portability.
Specifications Model 2929
INDICATED USE: scaler for alpha beta sample counting
DETECTOR COMPATIBILITY: phoswich or proportional type detectors
HIGH VOLTAGE: adjustable from 200-2500 volts
THRESHOLDS:
beta: 4 mV
alpha: 175 mV
BETA WINDOW: 50 mV
SCALERS: 2 ea. 6-digit LED displays with a range of 0-999999 counts
SCALER LINEARITY: reading within 2% of true value
TIMER: thumb wheel adjustment from 0-99 minutes with selectable multipliers of x0.1, x1, x10, or EXT for manual timing
DATA-OUTPUT: two 15-pin connectors allowing for recorder and printers (one for alpha, one for beta)
AUDIO: built-in unimorph type speakers with volume controls to provide a dual tone (1 per channel) click-per-event audio
AMP OUT: “BNC” connector provides amplified detector pulse
METER DIAL: 0-2.5 kV
METER: 6.4 cm (2.5 in.) arc, 1 mA movement analog type
POWER: 95-250 Vac, 50-60 Hz single phase
SIZE: 24.4 x 37.1 x 25.1 cm (9.6 x 14.6 x 9.9 in.) (H x W x D)
WEIGHT: 5.5 kg (12.1 lb) including detector
Specifications 43-10-1
INDICATED USE: alpha/beta sample counting
DETECTOR TYPE: scintillator: ZnS (Ag) adhered to plastic scintillation disk
PHOTOMULTIPLIER TUBE: 5.1 cm (2 in.)
OPERATING VOLTAGE: 500 to 1200 volts
WINDOW: 0.4 mg/cm²
EFFICIENCY (4π): 37% for 239Pu; 32% for 230Th; 39% for 238U; 5% for 14C; 27% for 99Tc; 29% for 137Cs; 26% for 99Sr/90Y
BACKGROUND:
WINDOW: 0.4 mg/cm²
EFFICIENCY (4π): 37% for 239Pu; 32% for 230Th; 39% for 238U; 5% for 14C; 27% for 99Tc; 29% for 137Cs; 26% for 99Sr/90Y
BACKGROUND:
- alpha: 3 cpm or less
- beta: 80 cpm
SAMPLE HOLDER: anodized aluminum tray with sample ring to allow for 2.5 cm (1 in.) or 5.1 cm (2 in.) diameter samples
SAMPLE SIZE (maximum): 5.1 x 0.9 cm (2 x 0.4 in.) (Dia x L)
SIZE: 23.6 x 11.4 x 23.6 cm (9.3 x 4.5 x 9.3 in.) (H x W x L)
WEIGHT: 1.9 kg (4.1 lb)
SAMPLE SIZE (maximum): 5.1 x 0.9 cm (2 x 0.4 in.) (Dia x L)
SIZE: 23.6 x 11.4 x 23.6 cm (9.3 x 4.5 x 9.3 in.) (H x W x L)
WEIGHT: 1.9 kg (4.1 lb)
