摘要
p>37p>Cs and p>90p>Sr concentrations in spruce needles have been determined in samples gathered from Norway spruce trees at various locations the northern part of Austria. In needles from 1985 p>137p>Cs concentrations ranged between 5 and 160 Bq/kg. After the Chernobyl accident a maximum of 1466 Bq/kg can be seen in needles of age group (I), harvested in September 1986 and up to 3800 Bq/kg for those of the age group (II), which are one year older, when collected also in September 1986. Right after the Chernobyl contamination of 1986, p>90p>Sr concentrations in spruce needles of the age group (II) reached 25–50 Bq/kg, which was about twice as high as the values before, in 1985. A maximum value of 66 Bq/kg was measured. Radionuclide ratios of p>90p>Sr/p>137p>Cs amounted to approximately 0.10 in less contaminated areas according to a lower p>137p>Cs deposition. In the higher contaminated areas, these ratios remained 0.05 or even 0.02, if corrected for the background levels of p>90p>Sr from 1985. These values corresponded with the ratios of 0.012 and 0.014 determined in air filter samplings from Vienna and Linz, respectively.
