A compact search device with telescopic tube for quick detection and localization of gamma and beta radiation sources.

5 seconds are enough for quick evaluation of gamma background with 4 built-in Geiger-Muller counters. A big display with luminescent backlight simultaneously indicates units of measurement, measurement errors, threshold level and real time. Analog indicator of radiation intensity facilitates localization of radiation sources. The device has a built-in memory for 1200 measurements and 999 objects of inspection.

More STORA-TU can also transfer measurement results to smartphones and tablets running Android OS in real time. With the help of GS Ecotest application this information is processed, displayed in a user-friendly way and stored in a special database.

Measurement results can also be transferred to a personal computer through the Bluetooth channel.

Purpose of Use

  • Measurement of gamma and X-ray radiation ambient dose equivalent rate (DER).
  • Measurement of surface beta-particles flux density.
  • Real time and date display, alarm clock function.


  • Damp and dustproof body IP54.
  • Big display with luminescent backlight.
  • Simultaneous indication of measurement units, measurement errors, threshold level and real time.
  • Analog twelve-segment indicator of registered radiation intensity.
  • Ability to perform measurements with a preset error.
  • Four-level indication of battery discharge.
  • Built-in memory which allows storing up to 1200 measurements and 999 numbers of the measured objects with ability to view the recorded information on the display of the device.
  • Mode of PC connection via Bluetooth.
  • Three independent measuring channels with alternate indication of data on the single liquid crystal display.
  • Prompt evaluation of gamma background within 5 seconds.
  • Automatic subtraction of gamma background at measurement of beta contamination.
  • Four built-in gamma, beta sensitive Geiger-Muller counters.
  • Automatic setting of measurement intervals and ranges.
  • Audio signaling of each detected gamma-quantum and beta-particle that can be switched off.
  • Two-tone audio alarm of exceeded programmed threshold levels.
  • Operation with telescopic tube.
  • Two AAA batteries.


Measurement ranges and main relative errors

  • Gamma and X-ray radiation ambient dose equivalent rate (137Cs)
    0.1…999.9 µSv/h
    ±(15+2/H*(10))%,where H*(10) is a numeric value of measured DER equivalent to µSv/h
  • Beta-particles flux density (90Sr+90Y)
    5…100 000 1/(cm2×min)
    ±(20+200/φβ)%, where φβ is a numeric value of measured beta-particles flux density equivalent to part./(cm²×min)
  • 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
    flux density 0.01 10³/(cm²×min)

Time of continuous operation with fully charged batteries* 2 500 hours
Operating temperature range -20…+50 °С
Weight 0.44 kg
Dimensions 160×75×35 mm

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