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Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 0
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 1
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 2
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 3
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 4
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 0
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 1
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 2
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 3
Ludlum Geiger Counter model 177. Alarm + Beta/Gamma Detector model 44-21. TESTED, US $750.00 – Picture 4

Ludlum Geiger Counter Model 177. Alarm + Beta/gamma Detector Model 44-21. Tested

US $750.00

  • Madison, Wisconsin, United States
  • Mar 3rd
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This listing is for a Ludlum model 177 Geiger counter with alarm and a Ludlum model 44-21 detector which is for low energy Beta and Gamma detection.  We tested them together with two conjoined BNC cables which are included in this sale. Both the counter and detector are in excellent condition both functionally and cosmetically.  The unit is light and compact and the internal battery trickle charges whenever the unit is plugged in to a 120V outlet so it is portable and can be used without the power cord.  These are very nice, versatile systems, and still in production. From the manufacturer's website: Model 177   High Voltage        Threshold                Meter Dial                                      Multipliers                         Response                                                400-1500 Vdc    -10 to -100 mV    0-500 cpm, 0-1.5 kV; BAT TEST     x1, x10, x100, x1K     FAST: 2.2 seconds SLOW: 22 seconds            Model 44-21 Detector Application;   low energy beta-gamma     Detector Type;    1 in. dia x 1 mm thick NaI adhered to a 0.001 in. thick plastic scintillator  Area (Active/ Open) Window:  5.1 cm2 / 5.1 cm2 3.4 mg/cm2      Efficiency:   (4 ?)    19%-129I 5%-14C 28%-32P Bkg Sensitivity:  450 cpm 20 kcpm/ mR/hr (137Cs)   Dead Time:     10-15 µsec  Energy Response:   energy dependent    Beta Cutoff:   500-1200    Operating Voltage   47-1560Vdc  If not satisfied for any reason return it us, well packed, and we will refund all but the shipping costs.
Condition:
Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...
Brand Ludlum
Model 177, 44-21

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