Transfer factor of 131I from the fallout to human thyroid dose equivalent after the Chernobyl accident.
A similar pattern of variation with time in observed maxima of daily dose equivalent rates in human thyroids (TD - microSv.d-1) and of daily fallout radioactivities (FR - kBq.m-2) has been found after the Chernobyl accident. An estimate of the time-lag between the maxima in TD lines and the preceding FR peaks was made of about seven days for adult and nine days for juveniles. Applying this time-lag it was possible to estimate transfer factors from the fallout to thyroid dose equivalent: the highest estimated values were 221 microSv/kBq.m-2 for adult and 641 microSv/kBq.m-2 for juvenile thyroids. These values differ from those published by UNSCEAR (United Nations 1988), which have been calculated for various regions of Czechoslovakia, from ingestion and inhalation intake estimates. A broad variation of transfer factor values could be expected to result from such transfer calculations using ingestion and inhalation estimates. The findings also support the concept of a need for prolonged iodine prophylaxy after emissions of radioiodine into the environment.
Beno
M
M
Research Institute of Preventive and Clinical Medicine, Bratislava, CSFR.
Mikulecký
M
M
Hrabina
J
J
D000059:Accidents; D006801:Humans; D007457:Iodine Radioisotopes / Q000032:analysis; D009688:Nuclear Reactors; D011829:Radiation Dosage; D011847:Radioactive Fallout / Q000032:analysis*; D012044:Regression Analysis; D013961:Thyroid Gland / Q000528:radiation effects*; D014455:Ukraine
D007457:Iodine Radioisotopes; D011847:Radioactive Fallout