Automess 6150AD-p Contamination Monitoring Probe

The probe serves to detect surface contamination in conjunction with any 6150AD model. If connected to the 6150AD, the 6150AD automatically selects the unit S-1 (pulses per second, counts per second).

All functions as described in the 6150AD’s data sheet remain available, where pulse rate and pulse number take the place of dose rate and dose, respectively.

The indication in S-1 needs to be multiplied by a calibration factor to convert it into surface related activity (Bq/cm2). The calibration factor depends on the type of radionuclide. The radionuclide needs to be known or assumed. The probes cannot serve to determine the radionuclide. Calibration factors for some radionnuclides can be found in the technical data table, and many others are specified in the detailed operating manual.

The detector of the probe 6150AD-p is a GM counter pancake type. With the protective cap removed, it is sensitive to alpha, beta, and gamma radiation thereby allowing to monitor surface contamination including wipe surveys. The protective cap has a built in energy compensation which enables the probe to detect photon radiation at low dose rates. Low energies (e.g., »soft« Xrays) down to a few keV are possible.

Please note that the probe 6150AD-p requires a probe cable which is not included and has to be ordered separately. The following standard cable lengths are available: 1.25m / 3m / 5m / 10m / 20m / 75m / 100m.

Automess 6150AD-p Contamination Monitoring Probe Key Features

  • Detector: end window GM counter pancake type
  • Each probe gets all the benefits from the 6150AD:
    • Automatic range selection
    • Smart time constant
    • Simultaneously measures current value, average value, and maximum value of pulse rate, as well as total pulse number
    • Alarm thresholds for both pulse rate and pulse number including one freely programmable threshold each
  • Power supply through probe cable, does not require a battery of its own, low current consumption

Automess 6150AD-p Contamination Monitoring Probe Specifications

Detector End window tube LND 7312,  not energy compensated, gamma sensitivity at Cs-137 approximately 19000 pulses per 􀈝Sv
Tube window Dimensions: diameter 4.45 cm, that is 15.6 cm² in area. Material: mica, areal density 1.5 - 2 mg/cm2
Range 0.01 S-1 to approx. 20 kS-1
Indication at natural background Approx. 0.74 S-1
Calibration factors for some selected radionuclide Am-241: 0.34 (Bq/cm2)/S-1
C-14: 0.64 (Bq/cm2)/S-1
Sr-90(/Y-90): 0.07 (Bq/cm2)/S-1
Detection limits for some selected  radionuclide Am-241: 0.18 Bq/cm2
Co-60: 0.21 Bq/cm2
Temperature range (test conditions) -30°C to +60°C (Cs-137 gamma radiation free in air)
Humidity & pressure 0 to 95% relative humidity, atmospheric pressure 60 to 130 kPa (600 to 1300 mbar)
Geotropism None (no change of response as a result of gravitational effects)
Power supply 4.75 Volt out of Dose Rate Meter 6150AD
Battery life including the 6150AD Approx. 1500 hours at low count rates, with the 6150AD’s illumination off, with alkaline battery 6LR61
Dimensions 330 x 65 x 40 mm3 without protective cap
Weight Approx. 450 g without protective cap
Probe cable Max. 100 m


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