Purpose of use

  • Measurement of gamma and X-ray radiation ambient dose equivalent rate.
  • Measurement of gamma and X-ray radiation ambient dose equivalent.
  • Measurement of surface beta-particles flux density.
  • Measurement of dose equivalent accumulation time.
  • Real time measurement (clock).


  • Five independent measuring channels with alternate indication of data on the single liquid crystal display.
  • Built-in gamma, beta sensitive Geiger-Muller counter.
  • Prompt evaluation of gamma background within 10 seconds.
  • Automatic subtraction of gamma background at measurement of beta contamination.
  • Measurement results averaging, manually and automatically interrupted.
  • Automatic setting of measurement intervals and ranges.
  • Audio signalling of each detected gamma-quantum and beta-particle with possible switching off.
  • Two-tone audio alarm of exceeded programmed threshold levels.
  • Digital display backlight.
  • Two AAA size batteries.
  • Low battery indication.
  • Shock resistant frame.
  • Small weight and dimension parameters.

Delivery kit

  • TERRA dosimeter-radiometer;
  • operating manual;
  • software
  • certificate
  • cardboard box;
  • leather case.


  • Measurement ranges and main relative errors:
    Gamma and X-ray radiation ambient dose equivalent rate (137Cs)
    0.1…9 999 µSv/h
  • Main relative error %
    ±(15+2/H*(10)), where H*(10) is a numeric value of measured DER equivalent to µSv/h
  • Gamma and X-ray radiation ambient dose equivalent (137Cs)
    0.001…9 999 mSv ±15%
  • Beta-particles flux density (90Sr+90Y) 1/(cm²×min) 10…100 000;
    % ±(20+200/φβ), where φβ is a numeric value of measured beta-particles flux density equivalent to part./(cm²×min)
  • Ambient dose equivalent accumulation time and accuracy of measurement
    1 min…9 999 h; ±0.1 s per 24 h

Energy ranges of measurement and energy dependence:

  • Gamma and X-ray radiation
    0.05…3.0; ±25% MeV
  • Beta radiation
    0.5…3.0 MeV
  • Resolution of threshold level programming for:
    – dose rate 0.01 µSv/h
    – dose 0.001 mSv
    – flux density 10³/(cm²×min) 0.01

Battery life* 1 500 hours

Operating temperature range -20…+50 °С

Weight 0.2 kg

Dimensions 120×52×26 mm

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