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PubMed1992

Small-scale variation in deposition of radiocaesium from the Chernobyl fallout on cultivated grasslands in Norway.

Soil samples from nine field experiments on cultivated grassland showed a variation in deposition of radiocaesium, expressed as the relative standard deviation, from 11 to 111% within an area of 16.5 x 10 m2. At the site with the highest variability, situated in a mountainous region of south eastern Norway, a further study was performed. Double sampling including surface measurements with in situ gamma-spectrometry using a portable multi-channel analyser (3 x 3 in Nal detector) and limited soil sampling gave the same average deposition and standard error as an extensive soil sampling. There were no trends in the deposition within the experimental field and most of the variation was found within plots (1.5 x 2.5 m2). 'Hot spots' were found in connection with small depressions (2-5 cm) in the terrain, and the area of a hot spot was estimated to be 100 cm2 from field measurements with a Geiger-Müller counter.

Accidents↗
PubMed1988

[One year after Chernobyl. Cesium-137 levels in premature, newborn and nursing infants and in younger and older children of Bonn and environs].

From May to August 1987, 137Cs activity was measured in a total-body counter (4 pi counter) in 33 premature and mature newborns (group I), 40 infants and young children up to 2 4/12 years of age (group II), and 15 children between 3 and 6 8/12 years (group III), all from Bonn or its environs. The mean of measurements in group II, at 3.7 Bq/kg body-weight, was lower than that of group I (5.8 Bq) and III (9.4 Bq). Mean radiation exposure, calculated from these data, was 1.7 mrem/a for group I, 1.1 mrem/a for group II, and 2.8 mrem/a for group III. A comparison with present Cs values in adults and measurements made at the end of the 1950's and beginning of 60's showed good agreement. There were no significant differences, as regards Cs activity, between newborns or infants who had been formula-fed or breast-fed. The measured radiation exposure of the three groups is about 1% of natural radiation exposure. Thus, present-day results indicate that there will be no damage to health outside the natural scatter.

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