Several independent systems are in operation to monitor ambient exposure in Switzerland:

URAnet Aero - URA
URAnet Aero is an automatic measurement network for the rapid detection (30 minutes) of an increase in radioactivity in the air; it is operated by the URA section and has 15 stations spread throughout the country.
NADAM - CENAL
NADAM is an automatic dose rate monitoring network operated by the National Alarm Centre (CENAL), with 63 stations throughout Switzerland.
MADUK - IFSN
MADUK is an automatic network dedicated to monitoring dose rates in the vicinity of nuclear power plants; it is operated by the Swiss Federal Nuclear Safety Inspectorate (ENSI) and comprises 57 stations located near Swiss nuclear power plants and the Paul Scherrer Institute.
Last modification 30.01.2025
Contact
Federal Office of Public Health FOPH
Radiological Protection Division
Ambient Radioactivity Section
Schwarzenburgstrasse 157
3003
Bern
Switzerland
Tel.
+41 58 462 96 14