Sarad RTM2200 - Radon and thoron measurement system

Item number: 12-238

10.662,40 €

including 19% VAT. , no shipping costs


Shipping time: 2 - 3 workdays


Radon and thoron measurement system RTM?2200

Even in the basic version, the RTM?2200 represents the perfect radon/thoron monitor for any kind of radon measurement. The outstanding performance of the unit becomes really visible, if complex sampling procedures must be applied. Due to its versatile possibilities for connecting additional sensors and actors, a multi-parameter station can be created without effort. The Radon/Thoron detector RTM?2200 is not limited to the data acquisition but is also able to control equipment which is required for the sampling (e.g. pumps, valves, positioning etc.).

By connection of up to four additional radon chambers (soil gas probe, indoor air sensor) it is possible to measure the radon concentration in different rooms with one radon/thoron monitor. In addition differential pressure and temperature sensors may complete a sampling system to investigate the radon transportation processes in buildings and facilities.

Another application is the geo-physical instrumentation, where water analytics and sampling of soil gases can be integrated. A spectroscopic NaI(Tl) gamma detector and/or gas sensors for carbon monoxide and combustible gases are very helpful for the mining and uranium industry. There is no limit for your ideas.

RTM2200 combines many advantages

The radon measurement chamber, based on the principal of high voltage collection, offers a high sensitivity at a small internal volume. This is a big advantage for thoron sensitivity and it allows to use a small pump rate which is often important (soil gas sampling).

The long term contamination by Polonium-210, known from other measurement principals is completely rejected. There is no cross sensitivity to ambient gamma radiation. Due to its special design, the chamber is not sensitive against variations of the ambient humidity. The commonly used drying equipment for instruments using this principal is not required for the RTM?2200.

We use high quality silicon radiation detectors inside the chamber to separate the various radon daughter products by alpha spectroscopy.

Quality assurance is a basic concern of every radiation measurement. Therefore, the radon/thoron monitor RTM?2200 saves a complete alpha spectrum for each data record. The spectrum always allows to check the error free operation of the unit.

Display of measured values, data storage and connections

All results are presented on a large display with touch buttons. A SD memory card allows collecting of a huge amount of data if necessary. Each record will be stamped by the GPS coordinates, if the GPS option has been chosen. Data transfer is realized by USB port and serial interface (RS-232). The RS-232 allows the connection of broadband mobile modems. Optionally, the serial port can be replaced by an integrated wireless network adapter (Net Monitors).

Technical data

Radon chamber (Internal)
Detector4 x 200mm² ion-implanted silicon detector
Internal volume250mm³ (total volumeof the internal air loop)
Range0...10 MBq/m³
Sensitivity3 or 7 cpm/(kBq/m³) for fast or slow mode
Response time12 or 120 min for fast or slow mode

Radon concentration fast (excl. Po-214) and slow (incl. Po-214)

Thoron concentration

Storage of time distribution and spectra


High quality membrane pump

Flow rate 0.3 l/min controlled by processor

Gamma probe (option) Connected by a cable to front panel of the RTM2200

NaJ(Tl) with integrated PMT and HV supply

Scintillation crystal 2“ x 2“

Energy range for Spectroscopy 40 keV –2.7 MeV

Resolution 8% (Cs-137)

ResultsLocal dose rate, net activityof six user defined nuclides Storage of time distribution and spectra
Dimensions of probe

Diameter 60 mm, Length 260 mm

Connection cable 5 m (optional 10m)

Additional Radon chambersConnected by a cable to front panel of the RTM2200
Soil gas probeStainless steel probe for permanent installation in the soil, additional sensors for humidity and temperature (for specification see data sheet)
Indoor air sensorLike internal Radonchamber, pump or diffusion (for specification see data sheet)
ResultsLike internal Radon chamber
Additional sensors
Standard unit (internal)

Rel. humidity 0 ...100%, accuracy ± 2%

Temperature -20 ... 40°C, accuracy± 0.5°C

Bar. pressure 800 ... 1200 mbar, accuracy 0.5% MW

Flow rate 0 ... 0.6 l/min, accuracy± 5%

Humidity/temperature sensor inside the air internal air loop

Air analytic (option)CO, CO2, CH4, combustible gases etc., various ranges available
Water analytic (option)pH-value, redoxpotential, conductivity etc.
Process (option)Pressure, differential pressure, flow rate, stream velocity, soil moisture etc.
Meteorology (option)Wind direction, Wind speed etc.
SamplingSimultaneous sampling of all detectors/sensors with respect to the selected sampling program
Sampling programs

Storage of up to 16 sampling programs with up to 32 steps (defined or infinite repetition)

Sampling intervalfrom one secondto weeks

MemorySDcard, 2 GB (larger cards can be also inserted)

Touchscreen 6 x 9cm wide

Interfaces: USB and RS232 (or wireless network adapter)

Power supply

Internal 12V rechargeable battery, AC/DC wall adapter

Option: additional connector for 12V car battery or solar power station

Dimensions / weight235mm x 140mm x 255mm / approx. 6kg

dVISION: Control and data transfer (also via GPRS, GSM, Net Monitors), visualization, data management

dCONFIG: system configuration, creating/changing cycles (also via GPRS, GSM, Net Monitors)

dLIBRARY: Library for NaI gamma probe (option)

ExtensionsInternal screw terminals: 8 analogous inputs, 3 counter inputs, 2 status inputs, 6 switch outputs, clock timer, PID-regulator/analogous output
GPS (option)

GPS coordinates are recorded and stored together with the measurement results. GIS compatible *.kmlfiles can be exported (can be opened by Google-Earth).

Antenna connected by cable.

Scope of delivery

  • Charger
  • USB-cable
  • Serial cable


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