The Model 3-97 provides a great solution for locating potential contamination and then accurately measuring the exposure rate, or for simply measuring the ambient exposure levels over a wide range. The instrument is equipped with an internal 2.5 x 2.5 cm (1 x 1 in.) NaI detector that is highly sensitive to gamma, with readings in the μR range between 0 to 3000 μR/hr (0 to 3 mR/hr). The instrument is additionally equipped with an external Model 44-38 energy-compensated GM to extend the detection range up to 200 mR/hr. The ratemeter is Ludlum’s venerable Model 3-series, which employs a robust cast aluminum instrument housing with a separate battery compartment for long-lasting protection and instrument life. The front-panel controls include a rotary switch for selecting the 4-decade range, instrument shut-off and battery test, audio on/off switch, fast/slow response switch, count reset button, and internal/external detector switch. 

The Ludlum Model 44-9 is a “Pancake” style GM Detector.  This detector is sensitive to alpha, beta, and gamma radiation.  Its size and shape provide easy handling for surveying or personnel monitoring.  The detector is energy dependent, over-responding by a factor of 6 in the 60 keV to 100 kdV range when normalized to ¹³⁷Cs.

●  Application: Alpha, Beta, Gamma Survey, Sample Counting
●  Detector: GM Pancake
●  Active/Open Area (cm²): 15/12, Window (mg/cm²⁾: 1.7 Mica
●  Background: 60 cpm, Sensitivity: 3300 cpm/mR/hr
The Ludlum Model 44-9 Alpha Beta Gamma Radiation GM pancake type detector is arguably the most popular radiation detector used throughout the world.  This detector is sensitive to alpha, beta and gamma radiation, is enclosed within a rugged metal enclosure, and is conveniently shaped and sized for checking contamination on people and objects. This detector operates between 850 to 1000 volts and is compatible with any Ludlum instrument capable of supplying 900 VDC and an input sensitivity of 30 mV or higher.

Most come with a “C” connector.  We have MHV or BNC available.  Let us know what type connector you require.

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