Abstract
The amount of radioecologically significant iodine in sea algae was determined during the period from June 1982 to May 1983, applying the PIXE method. Parallel analyses were carried out on aliquot samples by two PIXE systems one at Tohoku University and one at NIRS. The results of the two systems for the corresponding samples were reasonably analogous. The annual mean value was 190 ppm in dry matter. The pattern suggested that the content of stable iodine changed periodically, showing three maxima: in September, March and May. The highest value was found in March (430 ppm in dry matter), whereas the lowest was found in December (95 ppm), the variation factor being nearly 4.5 in magnitude. This variation was not caused by the change of tide and currents in the environment nor by the physiological activities of the algae under natural conditions, but rather by the effect of harvestings for commercial foods. This detailed information on stable iodine can possibly provide the amount of its radioisotopes. which, as is currently expected in the field of radioecology, is necessary for a more precise evaluation of radiation doses.
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