UMB1C UV/Ionising Radiation and Dosimetry

  • Well plates
    Bjørn Johnsen

The dosimetry of UV and ionizing radiation is central to CERAD’s research. The centre measures, characterizes and monitors doses in experiments at the NMBU gamma irradiation facility, as well as in the field, using passive dosimeters combined with GPS monitoring (i.e., wildlife dosimetry). Under Umbrella 1C, we develop a common dose concept for ionizing and UV radiation, in order to utilize the existing UV – network and the UV –dose maps within areas affected by radioactive fallout or NORM.


  • In collaboration with international research partners, we have attached dosimeters with GPS to free-ranging wildlife (Reindeer in Norway, Brown Bear in Sweden, and Wild Boar and Snakes in Japan). The instruments collect dosimetry as well as location data of the animals in almost real-time frequencies, as the animals move naturally through habitats that vary widely in contaminant levels. We have thus obtained much more accurate measurements than have been possible before (external dose was derived from soil samples and a Concentration Ratio, with large uncertainties).  This research has shown us how animals use spatially complex micro-habitats over time, and how this  results in dose variations. The added precision is most important in dose-effect research, which has traditionally been plagued by large uncertainties. Our research is providing much needed data on the effects of chronic exposures to low-dose rate exposures and some results of mammalian models, such as boar, can be extrapolated to humans.



Published 7. April 2017 - 10:18 - Updated 22. October 2020 - 14:45