CoMo 170

CoMo 170

Mobile contamination monitor for the high-sensitive and nuclide referred measurement of surfaces with regard to
α-, β- and γ-contaminations when handling ionising radiation.


Fields of application

Civil Defence, Authorities, Customs, Nuclear Medicine,
Nuclear Technology, Industry, Research



  • efficient, portable contamination monitor with thin-layer plastic scintillation detector completely working without gas-filled or
    gas flow proportional detectors
  • measurement of alpha, beta and gamma radiation with only one detector  (the measuring system automatically detects the existence of alpha radiation)
  • possibility of simultaneous or selective measurement of α- and
  • easy-to-use (convenient operation with 5 membrane-switch arrays)
  • settings and important measurement parameters are secured
    by a password
  • integrated data storage, optional software for reading out and processing this measuring data 
  • connection facility for different external probes,
    e.g. for dose rate measurement
  • automatic probe identification
  • optional stationary use in wall station with voltage supply
  • a mechanically defective detector foil can be repaired by the user himself (no expensive detector repair required by the manufacturer
    as otherwise customary for xenon detectors) 
  • avoiding high costs for gas flushing 


Technical Data

Detector type

thin-layer plastic scintillation detector
with ZnS coating, with integrated
photo multiplier and detector electronics

Detector size 170 cm² detector surface, mechanically
protected by a honeycombed
protective grid
count rate
alpha: approx. 0,1 cps
beta/gamma: approx. 15 – 25 cps
Background count
rate substraction
with adjustable measuring time 
Function keys keyboard with 5 membrane-switch arrays
Alarm for each nuclide separately adjustable, acoustic alarm
Display of
measured values
either in cps or nuclide referred in
Bq or Bq/cm², digital and analog display
of measured values (bar graph)
Nuclides       25 calibrated nuclides, preset calibration
factors, changeable acc. to user-specific
requirements, integrated auto calibration
Measuring time continuous measurement with automatic or
parameterisable attenuation
Display large graphic LC-display 128 × 64 pixels,
with lighting
Temperature range -10°C up to +40°C,
special version up to -20°C
Power supply 2 batteries AA type or optionally:
corresponding rechargeable accumulators (NiCd, NiMH) or 
stationary use in wall station
Dimensions/Weight (280 × 125 × 135) mm / length with handle
approx. 750 g (with batteries)
Housing ergonomically shaped plastic housing
Interfaces serial interface RS-232
recharge/mains supply
external detectors

Efficiencies of various radionuclides

(average values of measurements with 100 cm² substances)

The nuclide referred efficiencies of the scintillation detector are comparable with those of common GM-tubes.











Sr-90 / Y-90 (auf Sr-90 bezogen)

ca. 14%

ca. 18%

ca. 25%

ca.   5%

ca. 42%

ca. 30%

ca.   7%

ca. 27%

ca. 27%

ca. 42%










Am-241 α

P-238 α

U-238 α

ca.   3%

ca.   8%

ca.   7%

ca. 12%

ca. 21%

ca. 35%

ca. 23%

ca. 43%

ca. 22%

ca. 12%

ca. 26%