- Monitoring airborne radioactivity in the proximity of nuclear facilities, isotope laboratories
- Simultaneous alpha, beta, gamma measurement with spectrum stabilization
- Automatic changing of filter cartridges
- Connectivity with data acquisition units, monitoring networks
- Autonomous operation with low maintenance requirements
- Outdoor operation - IP66 protection, wide operational temperature range
- The operation is not affected by the temperature, or dust content of the inlet air
- pre-heating, dehumidifier, cyclon for
dust extraction, sampling unit for
emission monitoring, local audible and
visual alarm, display
The OnRIM Online Radioactive Aerosol and Iodine Monitoring Station is a highly sensitive device intended for
measuring and creating reports and analysis about the environmental effects of radioactive releases in the
surroundings of nuclear facilities, such as nuclear power plants, radiopharmaceutical and industrial isotope
production companies, C-level isotope laboratories, as well as in case of nuclear accidents. The aerosol
measurement system is designed to continuously monitor the concentration of I-131 bound to aerosols, and of
elemental or organic forms of the radioactive iodine. The station can be configured to be deployed outdoors to
perform immission measurements or to perform emission measurements when connected to a ventilation system.
Capabilities of the system: The system performs continuous air sampling according to the adjustable
evaluation cycle time. The base measurement cycle time is 30 minutes. In case of a great increase in activity,
alarms can be generated within the base cycle time. In every cycle it determines the isotope selective activity
concentration for pre-defined nuclides at the sampling point. In basic construction the measurement system
measures the I-131 activity concentration. Further measurement capacities can be added for additional isotopes
(e.g. Cs-137). It determines the Cs-137 equivalent gamma, Am-241 equivalent alpha and the Sr-90 equivalent
beta emitting isotopes in 30 minutes, 6 hours, daily and average concentrations. The system draws the air samples
through a combined filter (aerosol, PACI, activated carbon), which absorbs >99% of the elementary, organic and
aerosol form of radioiodines. The filter captures not only radioiodine but also other radioactive aerosol
The minimum detectable activity concentration for I-131 at 4 m3/h volume flow with 30 minutes measurement time is 3 Bq/m3, <0.1 Bq/m3 for a 6 hour measurement cycle and <0.01 Bq/m3 for a 24 hour measurement cycle.
The instrument simultaneously and separately evaluates the absorbed alpha, beta and
gamma activities using a scintillation detector. It is possible to retrospectively evaluate the recorded spectra. In
case the filters are clogged, torn or need to be changed due to the high activity, the automated filter changer
performs the filter replacement.
The system has a weatherproof design and a modular construction. It can be used as a mobile measurement
device or can be mounted on a fixed stand and can be connected to external 230 V AC power supply. The station
can be optionally equipped with a visual and audible alarm capable alarm unit.
Data acquisition: The average readings are saved every 30 minutes.
Data transfer: The device can accept connection requests through multiple communication interfaces
(Ethernet, 3G/4G, LTE450). It is possible to query the measurement data and alarm signals from a remote data
centre. The unit stores measured data and error messages - calculated over 30-minute backup periods - until data