Equipment for Testing Measuring Devices at a Low-Level Radon Activity Concentration
Language English Country Switzerland Media electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
32183418
PubMed Central
PMC7142911
DOI
10.3390/ijerph17061904
PII: ijerph17061904
Knihovny.cz E-resources
- Keywords
- low-level radon activity concentration, radon, radon chamber, radon source,
- MeSH
- Atmosphere MeSH
- Radiation Monitoring * MeSH
- Air Pollutants, Radioactive analysis MeSH
- Radon analysis MeSH
- Air Pollution, Indoor analysis MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Air Pollutants, Radioactive MeSH
- Radon MeSH
The National Institute for Nuclear, Biological, and Chemical Protection, under the European project 16ENV10 MetroRADON (the European metrology program for innovation and research, EMPIR), has developed unique equipment for the testing of measuring devices at low-level radon activity concentrations. The equipment consists particularly of an airtight low-level radon chamber (LLRCH) with an inner volume of 324 liters; a Rn-222 type RF 5 flow-through source with a Ra-226 activity of 4.955 kBq developed by Czech Metrological Institute within the above-mentioned project; and a pressure vessel as a radon-free air source. The mass flow controller of the Bronkhorst EL-Flow type is a part of the apparatus and ensures the requested airflow through the radon source-partialized if necessary-through the chamber. The homogeneity of the atmosphere in the chamber is ensured by means of a continuously regulated fan (airflows in the range of 0.1-3.5 m·s-1 can be established). Another important chamber component is the measuring device of climatic conditions, since temperature, air pressure, and relative humidity must be determined. The construction of the equipment allows the time-stable radon activity concentration to be maintained at a precise level for several days. Radon concentration values can be arbitrarily and continuously set in the range from 100 Bq·m-3 to 300 Bq·m-3.
Czech Metrological Institute 102 00 Prague Czech Republic
National Institute for Nuclear Biological and Chemical protection 262 31 Milin Czech Republic
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Low-Level Radon Activity Concentration-A MetroRADON International Intercomparison
