Abstract
55FE has gained increased attention as a fallout isotope during recent years. With low energy 5.9 keV X-rays and a comparatively short half-life of 2.60 yr, this isotope would be relatively harmless to living organisms without being concentrated. An accumulation of iron occurs naturally, however, and human uptake and loss are small compared with total body content. Two main ecological routes for accumulation of 55Fe in man have been reported: a sea-plankton-fish-man chain, and a lichen-caribou-Eskimo chain in Alaska1–4. High concentrations are also found among Finnish5–6 and Swedish7 Lapps.
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