Model TBM-3S and TBM-3SR PANCAKE GM SURVEY METER
  Radiation detection/civil defense, for emergency response personnel, in the event of a nuclear crisis.

IMAGE, TBM-3SR bottom viewIMAGE, TBM-3SR

TBM-3SR with beta slide window

 The total weight of this superb alpha-beta-gamma  survey meter with its internal standard pancake GM detector and 200 hour plus 9 volt battery is only 22 ounces. The three LINEAR ranges are: 0-500, 5000, and 50,000 cpm and 0-0.15, 1.5 and 15 mR/hr. The anti saturation circuit has been designed and tested to 100 R/hr.  Thousands are in use around the world. Cited by the National Institute of Standards and Technology, SP 981, for Fire Department use and emergency response personnel.

 DS-TBM3S Survey Meter $525.00
 DS-TBM3SR Survey Meter with beta slide  window $555.00
SPECIFICATIONS:
 
  • Meter:
        TBM-3: 2-1/2'' Rectangular.
        TBM-3S & TBM-3SR: 2-1/2'' Ruggedized.
  • Ranges: 3 ranges, linear: 0-500; 0-5,000; 0-50,000 cpm (0-;15; 1.5; 15 mR/h).*
  • Switch Positions: Off, Battery Test, X100, X10, X1.
  • Audio:
        TBM-3: internally mounted speaker.
        TBM-3S & TBM-3SR: sonalert with volume control.
  • Detector: T-1190 ``pancake GM tube''
  • Diameter: 2''; 5cm
  • Window Diameter: 1-3/4''; 4.5 cm
  • Window Thickness: 1.5 mg/cm2.
  • Quench Gas: Halogen for long life.
  • Background: Typical 50 cpm. Thin Profile of tube (13mm) gives low background.
  • Efficiency: 100% for all Betas and Alphas that have the energy to penetrate the thin window. Gamma sensitivity nominal is 3,500 cpm/mR/hr (based on Cs 137).
  • Physical dimensions:
        3'' Wide x 5-1/4'' Long x 2-1/4'' High. Excluding meter and handle.
        (7.6 cm x 13.3 cm x 6 cm)
  • Beta Shield: Methacrylate 0.125'', 3.1 mm.
  • Calibration: Single master calibration pot as well as individual cal pots for each range.
  • Power: 9 volt ``transistor'' battery; Eveready 1222, or equivalent.
  • Battery Life: 100 hours in normal operation.
  • Handle: Swivel type, polished anodized aluminum.
    (Optional Detachable Handle TBM-3SR(DL) Upon Request)
  • Weight: 22 oz; 625 grams.

 

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