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Model 193

The Ludlum Model 193 Survey Meter is a portable gamma survey instrument with adjustable audio and visual alarms. The instrument is designed to be used with external scintillation detectors for optimum performance in locating and measuring low-level (near ˝background˝) gamma radiation.

The Model 193 offers two types of alarms for both experienced and inexperienced users:

  • A user adjustable meter-driven alarm for alarm indication above a particular set-point
  • A deviation beep alarm which gives indication to the rise of radiation above background levels

The unit features range multipliers of ×1, ×10, ×100, and ×1000, which provide an overall range of 0 to 5000 µR/hr when used in conjunction with a 0 to 5 µR/hr meter dial (others are available). Other features include a two-position meter response time switch, adjustable detector operating voltage (HV), and an audio ON/OFF switch. Multi-turn potentiometers are located under a removable front panel calibration cover (removed for clarity in image).

The instrument is capable of using either standard ˝D˝ cell batteries or nickel-cadmium rechargeable batteries. The two ˝D˝ cell batteries are located in an isolated compartment, easily accessible from the front panel.

  • Accurate (Energy-Flat) Ambient Dose Equivalent Rate Measurements
  • Eliminates High False Readings of Typical microR Meters
  • Rugged Scintillator, Will Not Leak
  • Low Range: Background to 19.99 µSv/h (1999 µrem/hr)
  • High Range: 1 to 1999 µSv/h (0.1 to 199.9 mrem/hr)
  • Improved Replacement for Bicron Microrem
  • "/E" Extended Version Has Low-Energy, 3.2 mg/cm2 Window for Operation Below 50 keV
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