M. I. Chepurny, S. V. Masiuk, L. M. Kovgan����Reconstruction of individual �internal thyroid doses �due to Chornobyl accident exposure: ��the problems and solutions ���
�� Base material for reconstruction of thyroid exposure doses in Ukraine� due to Chornobyl disaster: �mass scale measurements of radioiodine content in the thyroid ��Period of measurements:�May-June of 1986�� Organized:�by Ministry of health protection of Ukraine��Executing personnel:� mainly the staff of various medical institutions of Ukraine �� Advisory assistance�was provided by the team of specialists� from the Research Institute of Hygiene of Maritime Transport �(city of Leningrad) ��Number of measurements:�circa 150 000
USAGE OF THE MEASUREMENTS��1986 � Finding of the individuals with significant thyroid exposure �for providing of additional medical examinations �Dose assessments of emergency nature (extremely conservative) ��1992-1997 �Thyrodosimetric passportization of Ukraine’s settlements �Conservative dose assessments��1998 – 2013 �Epidemiological studies�Improved dose assessments for selected persons;�first estimations of dose uncertainties�� 2014 – 2016 �Revised thyrodosimetric passportization�Correction of doses estimations and their uncertainties �for all 150 000 of measured persons. �Calculation of realistic passport thyroid doses �for 30 000 settlements of Ukraine
Sources of uncertainty of dose estimation
Uncertainty of dose estimation
Uncertainty of direct thyroid measures
Uncertainty of data about individual behaviour
Uncertainty of parameters of ecological model
Fidelity of calculation procedure
Radioiodine content in thyroid depending of milk consumption
Influence of milk consumption on calculated thyroid dose �in case of direct thyroid measurement availability
Influence of relocation on calculated thyroid dose �in case of direct thyroid measurement availability
Important source of uncertainty in thyroid doses estimation – �uncertainty of the thyroid mass
� Investigation of device sensitivity �to incorporated radiocesium
Age correction factor values�for SRP-68-01 with different collimators�
Proposed values of calibration factors for SRP-68-01 �in case of lack of the calibration data �(the values are compared with experimental data from Kaidanovsky, Dolgirev)