GMP-25™ External Pancake Probe


GMP-25™ External Pancake Probe


The GMP-25 probe is intended for monitoring alpha, beta, gamma and X-ray radiation.

The GMP-25 is used as an external detector with the RDS-31/ iTx/iTxSD multi-purpose Radiation Survey Meters especially for surface contamination monitoring and source localization applications.

The GMP-25 probe is equipped with a Binder connector and connected to the mating bulk connector interface at the bottom of RDS-31 family survey meters.

The GMP-25 unit is a “smart” probe, having an internal high voltage generator and non-volatile memory for calibration coefficients and probe identification data. Thus the probe can be connected “on-the-fly” without the need for switching off the meter, which automatically recognizes the probe type and sets the meter reading to defined measuring unit.


  • Remote pulse rate measurements
  • For alpha/beta/gamma surface contamination measurements
  • Converts the meter into contamination monitor
  • Sensitive for low levels of alpha, beta and gamma radiation
  • For general contamination and frisking applications
  • Cord lengths up to 49.21' (15 m) upon request


  • Weight: 1.08 lb (.489 kg)
  • Equipped: Retractable cord, length 11.81" - 47.24" (30 - 120 cm)
  • Temperature Range:
    -Operation: -13° F to +131° F (-25° C to +55° C)
    -Storage: -40° F to +158° F (-40° C to +70° C)
  • Humidity: 0 - 95% relative humidity, non-condensing
  • Casing of Durable: ABS/polycarbonate, 14.8" l x 2.75" w (375 x 7 cm) (max)


  • Radiation Detected: Gamma-, beta- and alpha-rays
  • Energy Range: Gamma > 6 keV, beta Emax > 100 keV, and alpha > 2 MeV
  • Detector Type: GM tube 7313
  • Pulse Rate Range: 0 - 50 000 cps
  • Mica Window:
    -Active Area: 6.1 in2 (15.5 cm2)
    -Window Thickness: 1.5 - 2 mg/cm2
  • Sensitivity: 2.8 cps (170 cpm) for 90Sr/90Y uniform source of 0.37 Bq/cm2


    078-480 Probe, External, GMP-25
    Includes: Fixed Spiral Cable 11.81" - 4.92' (30 cm - 1.5 m).

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