Compact device designed for measurements of gamma and X-radiation ambient equivalent dose (and dose rate), as well as for measurement the flux density of beta particles from contaminated surfaces.
There is 'search mode' for measure count rate in counts per second (cps).

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AT6130, AT6130A, AT6130D
Radiation monitor - dosimeter



Small size and low weight
Automatic compensation of own background
Sound and visual alarm in case threshold level of dose, dose rate or flux density
Rapid answer for significant change of dose rate (measurement restart)
Selective measurement of beta and gamma radiation in mixed fields
Operation in harsh condition
Signals in the 'search mode' for each particle (via headphones as well)
Up to 2000 records of result in the non-volatile memory with data about measurements date and time
Indication on LED result data, current time, date and battery life
Bluetooth interface for connection with PC (optionally)


Device operating principle is based on the process of count rate measurement of pulses generated in Geiger-Muller counter tube under the influence of X, gamma and beta radiation.
Count rate is converted automatically into physical values. Energy compensating filter allows correcting energy dependence of sensitivity efficiently in entire energy range of photon radiation.
Microprocessor-based unit is responsible for controlling the radiation monitor operating modes, calculations, storing and displaying measurement results and for self-checking function.
To easy use during the measurements of surface contamination the monitor can be hold in the bar.


Ambient equivalent dose rate of gamma and X radiation measurement range

0.1 µSv/h – 10 mSv/h(АТ6130,А)
0.1 µSv/h – 100 mSv/h(АТ6130D)

Ambient equivalent dose of gamma and X radiation measurement range

0.1 µSv – 100 mSv(АТ6130,А)
0.1 µSv – 1 Sv (АТ6130D)

Beta particles measurement range:
- flux density
- surface activity
- count rate

10 ... 10000 particle/min·
0.5 ... 500 Bq/
0.1 ... 10000 cps

Intrinsic relative error of dose rate measurement in the range from 0.1 µSv/h to 10 mSv/h

±20% max

X-ray and gamma radiation energy range

20 keV – 3 MeV (АТ6130)
50 keV – 3 MeV (АТ6130A,D)

Spectrum maximum energy range of registered beta particles

155 keV...3.5 MeV (АТ6130)

Energy dependence when gamma radiation dose rate is measured for Cs-137


- to Cs-137 gamma radiation
- to Sr-90+Y-90 beta radiation

2.8 cps/(µSv/h)
0.36 cps/(particles/min·

Response time for dose rate measurement
(for dose rate ≥1 µSv/h)

​≤7s (error ≤±10%)

Radiation overloading

Radiation monitor can withstand 100-fold rise of dose rate measurement and beta particles flux density upper range limit for 5 minutes with readings not lower than maximum

Continuous run time

​≥500 h

Working temperature range


Main view
Measurements beta particles
Dosimeter. Side view.
Dosimeter on the bar.
Dosimeter in the bag.
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TALS OY   Finland  Helsinki Merikasarminkatu 12 L 4, 00160

Radiation equipment, radiometers,

liquid scintillation counters.
Metrology of ionizing radiation.

Engineering and software for

spectrometric analysis.

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