Every year an special campaign week to detect radioactivity (Aerial radiometry) is driven by the Swiss Air Force. This - in combination with the ground based Automatic Dose Alarm and Monitoring Network (NADAM), the Network for Automatic Monitoring of the Dose Rate in the Vicinity of Nuclear Power Plants (MADUK, also ground based) and bi-monthly flown missions with the EKUR-equipped sample filter on an F-5 Tiger II - allows the government to monitor the ambient dose rate in and above Switzerland.
The Section Environmental Radioactivity (URA) of the Swiss Federal Office of Public Health (SFOPH) operates also two distinct air collection networks: RADAIR and LUSAN.
EKUR-Pod / Höhenflugfilter (HFF) on the F-5 Tiger
Two filters attached to the F-5 Tiger are deployed in the upper troposphere and lower stratosphere, meaning between 8,000 and 15,000 meters altitude, to collect aerosol samples. The filters are then analyzed in the URA laboratory in Liebefeld using gamma spectrometry. This method allows to detect the smallest concentrations of radioactivity in the higher air layers. Since the rapid air mass movements (jet streams) play primarily in the higher air layers, very large-scale shipments of radioactivity can be detected quickly before the radioactivity settles on soil and plants. Each flight takes 20-30 minutes and samples in between 2000 and 4000 kg of air with Mach 0.8.
Sample collector on the F-5 Tiger II and the results of the flights 2010-2016
Aerial radiometry with the Super Puma
Aerial radiometry enables the NEOC (National Emergency Operational Centre, the federal centre of expertise for exceptional incidents) to measure nuclide-specific deposits in the soil and activity over a large area. This is performed by a measurement system consisting of a NaI detector with a volume of 16.8 l; a spectrometer with 256 channels and automatic gain control; industrial computers for the control of the measurements, for data collection, processing and storing. For positioning a GPS receiver is used.
In three hours, a surface area of up to 70km2 can be measured. The measured values are tracked online and are presented in a ready-to-print map on landing. Aerial radiometry is used if a larger area needs to be scanned for radioactivity, e.g. following a transport accident, plane crash or during the search for sources of radioactivity that have either been lost or acquired illegally.
In three hours, a surface area of up to 70km2 can be measured. The measured values are tracked online and are presented in a ready-to-print map on landing. Aerial radiometry is used if a larger area needs to be scanned for radioactivity, e.g. following a transport accident, plane crash or during the search for sources of radioactivity that have either been lost or acquired illegally.
You can see Super Puma T-322 in use with the special equipment, monitoring the cities of Solothurn and Fribourg, the four national nuclear power stations, the area in between Berne and Kandersteg and the area of lake geneva.
Some pictures taken Mai 30th, 2018 above Fribourg/Freiburg:
Spectacular views with the Poya-Bridge - the helicopter has to follow the ground in 90m distance and in exact lines of 250m
The Cathedral of St. Nicholas in Fribourg, built in the Gothic style, dominates the center of the medieval town of Fribourg (Switzerland). It is built on a rocky outcrop 50 metres above the river Sarine (Saane).
The results of the flights showed normal readings and will be used as 0 (Zero)-probe of the city in case of an emergency.
The results of the flights showed normal readings and will be used as 0 (Zero)-probe of the city in case of an emergency.
