Ludlum Model 3 General Purpose Survey Meter with Model 44-21 Beta-Gamma Detector
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3-12 month warranty
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Includes:
- Model 3 General Purpose Survey Meter
PN: 48-1605
- Model 44-21 Beta-Gamma Detector
PN: 47-1560
The Model 3 is Ludlum’s best selling, general purpose, handheld, analog ratemeter known for accuracy and long-lasting dependability. It comes in a variety of measurement ranges and units to support the external radiation detector selected.
The cast aluminum instrument housing with a separate battery compartment and metal handle offer an industrial robustness and quality that promote long-lasting protection and instrument life. The front-panel controls include a rotary switch for selecting the four-decade range, instrument shut-off, and battery test, an audio on/off switch, a fast/slow response switch, and a count reset button.
A one meter (39 in.) straight type detector cable with “C” style connector is included in the price of the instrument.
Model 3 General Purpose Survey Meter:
| Application | Alpha, Beta, and Gamma surveying |
|---|---|
| Compatible Detectors | GM, Scintillation |
| Detection Range | Dependent on detector |
| Linearity | Reading within 10% of true value with detector connected |
| Meter Dial | 0 – 2 mR/hr, or 0 – 500 kcpm, BAT TEST
(Meter Faces tab lists other available meter faces) |
| Meter | 6.4 cm (2.5 in.) arc, 1 mA analog type |
| Controls |
|
| High Voltage | Adjustable from 400 to 1500 Vdc |
| Threshold | Fixed at -30 mV ± 10 mV |
| Temperature Range | -20 to 50 °C (-4 to 122 °F)
May be certified for operation from -40 to 65 °C (-40 to 150 °F) |
| Power | Two each “D” cell batteries housed in externally accessible sealed compartment |
| Battery Life | Typically greater than 2000 hours with alkaline batteries (battery condition can be checked on meter) |
| Construction | Cast and drawn aluminum with beige powder coat |
| Connector | Series “C” (others available) |
| Size (H x W x L) | 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.), including handle |
| Weight | 1.6 kg (3.5 lb), including batteries |
Model 44-21 Beta-Gamma Detector:
| Indicated Use | Beta; Low-energy gamma detection |
|---|---|
| Detector Type | NaI(Tl) scintillator, 2.54 cm (1 in) dia. x 0.1 cm (0.04 in) thick, adhered to plastic scintillator, 0.03 cm (0.01 in) thick |
| Window | 3.4 mg/cm2 |
| Window Area | Active: 5.1 cm2 (0.8 in2)
Open: 5.1 cm2 (0.8 in2) |
| Efficiency (4π) | 14C: 4%
32P: 28% 125I: 38% 129I: 19% |
| Typical Background
(10 µR/hr field) |
450 cpm |
| Non-Uniformity | < 10% |
| Photomultiplier Tube | 3.8 cm (1.5 in) diameter |
| Operating Voltage | 500 to 1200 V (typical) |
| Connector | Series “C” (others available) |
| Construction | Aluminum housing with beige powder coat |
| Size (D x L) | 5.1 x 18.5 cm (2 x 7.3 in) with connector cap |
| Weight | 0.5 kg (1 lb) |
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