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Airborne radiometric survey of a Chernobyl-contaminated mountain area in Norway - using ground-level measurements for
Håvard Thørring1, Vikas C Baranwal2, Martin A Ytre-Eide1
1Norwegian Radiation and Nuclear Safety Authority (DSA), P.O. Box 329, Skøyen, NO-0213, Oslo, Norway.
Abstract:
An airborne radiometric survey can be an efficient way to investigate contamination of large areas after nuclear accidents. In the current study, a helicopter borne gamma ray spectrometry survey was carried out in a vast mountainous area in Norway, where the contamination from the 1986 Chernobyl accident still affects animal husbandry more than 30 years after the fallout occurred. The 137Cs activity densities provided by the aerial survey was validated using various independent ground-based measurements - including soil samples and in situ measurements (at 1 m above ground). Despite considerable small-scale heterogeneity, demonstrated by the ground-based measurements, strong correlations were obtained between the results from the aerial survey - after introducing more detailed instrument calibration and spectre analysis - and the ground-level data. Adjusted R2 values were around 0.9, and linear correlation coefficients close to unity.
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