Abstract
The specific Si<sup>32</sup> activity of air in Denmark showed a seasonal variation by a factor of 5 in 1963. The total Si<sup>32</sup> fallout was 5.5·10<sup>–5</sup> dpm cm<sup>–2</sup> year<sup>–1</sup> in the period Sept. 64–Sept. 65. Measurements on accumulated snow and old glacier ice in Norway show Si<sup>32</sup> as an usable element for dating of up to 2000–3000 years old ice.
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