Page 101 - 2014 Printable Abstract Book
P. 101
because of severe earthquake and tsunami that occurred on 11 March, 2011. Radioactive releases from
the damaged reactors to atmosphere lasted about three weeks and included radionuclides of volatile
elements, iodine, tellurium and cesium, as well as inert gases. The total ground deposition of radiologically
important airborne Cs-134 and Cs-137 radionuclides in Japan was about an order of magnitude lower than
that in Europe after the Chernobyl accident in 1986. Thyroid doses incurred by the residents of Japan in
March-April 2011 due to intake of I-131 via inhalation and ingestion were the largest in human body.
Radiation doses in other organs and tissues were similar in various organs and tissues; they are gradually
accumulated due to longer term external exposure from Cs-134 and Cs-137 deposited in the environment
and, to less extent, due to ingestion of the same radionuclides. The contribution of short-lived
radionuclides to external dose incurred in 2011 was about 20%. From the semicircle area around
Fukushima-1 NPP with the radius of 20 km, all the about 90 thousand of residents were evacuated on 12-
15 March, 2011, before major radionuclide releases occurred. Although another ten thousand people
residing in the North-West radioactive trace (up to about 45 km from Fukushima-1 NPP) were evacuated
in March-June 2011 they obtained the largest radiation doses among the general public. Among
population that was not evacuated, the largest doses were incurred by the residents of Fukushima City
where radionuclide soil deposition was the largest in Japan. The average external doses of various age
and social population groups in every municipality of the Fukushima Prefecture and six neighboring
prefectures were assessed by UNSCEAR based on local radiation measurements by means of dosimetric
models elaborated from the results of post-Chernobyl studies. The external doses and internal inhalation
doses from the passage of radioactive plume were assessed by means of atmospheric transfer modelling.
For assessment of the ingestion doses, both food monitoring data and radioecological model FARMLAND
were used. The internal dose estimations were validated by comparison of modelled doses with the doses
estimated from human measurements. The number of I-131 thyroid measurements is limited (about
1300) and, therefore, uncertainty of thyroid dose reconstruction is substantial. The contribution to tissue
doses of the public from incorporated Cs-134 and Cs-137 is relatively minor; external dose dominates in
all organs except of thyroid. The range of average doses incurred by the residents of municipalities of the
st
Fukushima Prefecture during the 1 year after the accident is by a factor of 5 to10 lower than the dose
range was in the Chernobyl accident area. The range of average thyroid doses incurred by children residing
in settlements of the Fukushima Prefecture during two months after the accident (0 to about 30 mGy) is
by a factor of 10 to100 lower than the thyroid dose range was in children from the Chernobyl accident
area. The range of average doses in other organs and tissues than thyroid of the residents of settlements
st
of the Fukushima Prefecture during the 1 year after the accident (0 to about10 mGy) is by a factor of 5
to10 lower than the dose range was in the Chernobyl accident area. External exposure of the residents of
the Fukushima Prefecture will continue over few decades with declining dose rate, and the lifetime
st
external dose is estimated to be about three times the 1 year dose.
(S3003) Model of carcinogenesis in the UkrAm cohort based on omics data. Jan Christian Kaiser; Kristian
Unger; Horst Zitzelsberger; and Peter Jacob, Helmholtz Zentrum Muenchen, Oberschleissheim, Germany
Thyroid cancer risk after the Chornobyl accident has been studied in the UkrAm cohort of about
12,500 subjects who were children or adolescents at the time of the accident and who had their exposure
to I131 measured individually within two months after the accident. In five screening periods from 1998 -
2008 more than hundred (mostly papillary (PTC)) thyroid cancer cases have been detected. The dose-
response relationship from descriptive risk models shows a significantly elevated radiation risk especially
99 | P a g e
the damaged reactors to atmosphere lasted about three weeks and included radionuclides of volatile
elements, iodine, tellurium and cesium, as well as inert gases. The total ground deposition of radiologically
important airborne Cs-134 and Cs-137 radionuclides in Japan was about an order of magnitude lower than
that in Europe after the Chernobyl accident in 1986. Thyroid doses incurred by the residents of Japan in
March-April 2011 due to intake of I-131 via inhalation and ingestion were the largest in human body.
Radiation doses in other organs and tissues were similar in various organs and tissues; they are gradually
accumulated due to longer term external exposure from Cs-134 and Cs-137 deposited in the environment
and, to less extent, due to ingestion of the same radionuclides. The contribution of short-lived
radionuclides to external dose incurred in 2011 was about 20%. From the semicircle area around
Fukushima-1 NPP with the radius of 20 km, all the about 90 thousand of residents were evacuated on 12-
15 March, 2011, before major radionuclide releases occurred. Although another ten thousand people
residing in the North-West radioactive trace (up to about 45 km from Fukushima-1 NPP) were evacuated
in March-June 2011 they obtained the largest radiation doses among the general public. Among
population that was not evacuated, the largest doses were incurred by the residents of Fukushima City
where radionuclide soil deposition was the largest in Japan. The average external doses of various age
and social population groups in every municipality of the Fukushima Prefecture and six neighboring
prefectures were assessed by UNSCEAR based on local radiation measurements by means of dosimetric
models elaborated from the results of post-Chernobyl studies. The external doses and internal inhalation
doses from the passage of radioactive plume were assessed by means of atmospheric transfer modelling.
For assessment of the ingestion doses, both food monitoring data and radioecological model FARMLAND
were used. The internal dose estimations were validated by comparison of modelled doses with the doses
estimated from human measurements. The number of I-131 thyroid measurements is limited (about
1300) and, therefore, uncertainty of thyroid dose reconstruction is substantial. The contribution to tissue
doses of the public from incorporated Cs-134 and Cs-137 is relatively minor; external dose dominates in
all organs except of thyroid. The range of average doses incurred by the residents of municipalities of the
st
Fukushima Prefecture during the 1 year after the accident is by a factor of 5 to10 lower than the dose
range was in the Chernobyl accident area. The range of average thyroid doses incurred by children residing
in settlements of the Fukushima Prefecture during two months after the accident (0 to about 30 mGy) is
by a factor of 10 to100 lower than the thyroid dose range was in children from the Chernobyl accident
area. The range of average doses in other organs and tissues than thyroid of the residents of settlements
st
of the Fukushima Prefecture during the 1 year after the accident (0 to about10 mGy) is by a factor of 5
to10 lower than the dose range was in the Chernobyl accident area. External exposure of the residents of
the Fukushima Prefecture will continue over few decades with declining dose rate, and the lifetime
st
external dose is estimated to be about three times the 1 year dose.
(S3003) Model of carcinogenesis in the UkrAm cohort based on omics data. Jan Christian Kaiser; Kristian
Unger; Horst Zitzelsberger; and Peter Jacob, Helmholtz Zentrum Muenchen, Oberschleissheim, Germany
Thyroid cancer risk after the Chornobyl accident has been studied in the UkrAm cohort of about
12,500 subjects who were children or adolescents at the time of the accident and who had their exposure
to I131 measured individually within two months after the accident. In five screening periods from 1998 -
2008 more than hundred (mostly papillary (PTC)) thyroid cancer cases have been detected. The dose-
response relationship from descriptive risk models shows a significantly elevated radiation risk especially
99 | P a g e
