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[en] The mean 137Cs activity concentration in 278 liver samples of moose (Alces alces) from 16 municipalities located in different parts of Norway varied within the range 43-752 Bq kg-1 among the municipalities. In general the geographical variation corresponded to the fallout pattern produced by the Chernobyl accident. In three communities in the southernmost part of the country however the transfer factor, defined as the activity in moose liver divided by the corresponding level in surface soil, was 6.5 times higher on average than elsewhere in Norway. Possible reasons for this highly significant difference are discussed, and it is hypothesized that the apparently much higher plant uptake in the south may be related to extensive soil acidification in this area from transboundary pollution.
[en] The results of a large-scale survey of radon concentrations in Norwegian dwellings are reported. Measurements of radon have been made in a total of 7500 dwellings. The dwellings were randomly selected and the number in each municipality is proportional to its population. The measurements were performed using etched track detectors from the National Radiological Protection Board in the UK. One detector was placed in the main bedroom in each dwelling for 6 months. The annual average of radon concentration in Norwegian bedrooms is calculated to be 51 Bq.m-3. The frequency distribution is approximately log-normal with a geometric mean of 26 Bq.m-3 and about 4% of the bedrooms have concentrations above 200 Bq.m-3. The radon concentrations are found to be about 40% higher for bedrooms in single-family houses than in blocks of flats and other multifamily houses. In a large proportion of single-family houses the living room and the kitchen are located on the ground floor and the bedrooms on the first floor. An additional factor is that the winters of 1987-1988 and 1988-1989 were much warmer than normal. Taking these factors into account, the average radon concentration in Norwegian dwellings is estimated to be between 55 and 65 Bq.m-3. (author)
[en] The accumulation and long term behaviour of radiocaesium in mushrooms were studied at selected sites in Norway. A large variation in transfer factors between single species were found with the lowest value of 0.002 m2/kg for Leccinum versipelle up to 0.5 m2/kg for species of Amanita fulva and Amanita vaginata. Rozites caperata and Cortinarius armillatus were also found to accumulate radiocaesium very efficiently. For the study of long term behaviour of radiocaesium in mushrooms the same species were collected from the same location from 1989 to 1995. Two of four data sets showed a significant decrease in activity levels in the study period with an estimated effective ecological half-life in the range of 1.5-8 years, while a non-significant decrease and no decrease were indicated by the other two
[en] Institute for Energy Technology has annually collected the brown alga Fucus vesiculosus at several sampling locations along the Norwegian coast since 1980, mainly in August and September. At the south-western location Utsira, monthly samples have been collected regularly since January 1986. Time series for 99Tc and 137Cs in Fucus samples from Utsira are presented in this study. (au)