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Radiation Protection Dosimetry 108:133-141 (2004)
© 2004 © Oxford University Press 2004; all rights reserved

Thyroid dosimetry in the western trace of the Chernobyl accident plume

T. Nedveckaite1, V. Filistovic1,*, A. Mastauskas2 and K. Thiessen3

1 Institute of Physics, Savanoriu 231, Lt-2058, Lithuania
2 Radiation Protection Centre, Roziu 4, Lt-2004, Lithuania
3 SENES Oak Ridge, Inc., Center for Risk Analysis, Oak Ridge, Tennessee, USA

Corresponding author: vitfil{at}ktl.mii.lt

According to World Health Organization guidelines (WHO/SDE/PHE/99.6), the reference level for consideration in stable iodine prophylaxis is based on the inhalation exposure pathway. In the western trace of the Chernobyl accident, the measurement of airborne 131I fractions (aerosol-associated, gaseous reactive and gaseous organic) indicates that airborne gaseous reactive and, especially, organic 131I fractions were the major contributors to thyroid exposure due to inhalation. The contribution of inhaled short-lived radioiodines was negligible. To attain more precise thyroid exposure evaluation, 131I dose factors were determined as a function of age and prevalence of stable iodine deficiency. The results demonstrate that children with a stable iodine deficiency experienced at least two times higher thyroid doses than did children with a dietary iodine sufficiency. The results of these investigations demonstrate that in thyroid dosimetry it is important to know the stable iodine status as well as to have a standardised method for airborne radioiodine measurements, especially for consideration of stable iodine prophylaxis based on the inhalation exposure pathway.


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