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Hoang C. T.; Servant, J.; Labeyrie, J.
Health Physics: October 1968
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Les evaluations de la retombee de 55Fe (T1/2 = 2,7 ans) faites en France, au cours des annees 1962–1965 permettent de comparer pour chaque annee cette retombee a celle du 90Sr et d'en deduire leur rapport pour la bande de latitude 40°-50°N. Connaissant la retombee du 90Sr dans differentes bandes de latitude et au cours du temps, on en deduit alors les retombees aux diverses latitudes de 55Fe, et la retombee totale sur le globe. Celle-ci depuis le debut de 1962 jusqu'a la fin de 1965, s'eleve a 19 ± 2 MCi (comptees au moment de la chute). The evaluation of the 55Fe fallout (T1/2 = 2,7 years) for the years 1962–1965 in France allows us to compare this fallout with that of 90Sr and to deduce their ratio for each year and for the latitude band between 40° and 50°N. A knowledge of the 90Sr fallout for different bands of latitude during the same period allows one to deduce the corresponding values of 55Fe as well as the total amount of the 55Fe fallout on the surface of the globe. For the period 1962–1965, the total amount has been found to be 19 ± 2 MCi (the value given is corrected to the date of collection).

©1968Health Physics Society