Age-dependent calibration factors for in-vivo monitoring of 131I in thyroid using Monte Carlo simulations

Gómez-Ros, J.M.; Moraleda, M.; Teles, P.; Tymińska, K; Saizu, M. A.; Gregoratto, Demetrio; Lombardo, Pasquale; Berkovsky, V; Ratia, G.; Broggio, David

doi:10.1016/j.radmeas.2019.04.022

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…This was especially likely for individuals evacuated shortly after the accident to non-contaminated regions of Ukraine where they were measured (Table 2). The contribution to the response of the measuring device of 131 I activity distributed in the human body outside the thyroid gland, even for non-collimated NaI(TI) detectors, was estimated to be about 1-3% (Gómez-Ros et al 2019). Therefore, for devices equipped with collimators, the contribution of extrathyroidal iodine activity was insignificant from a practical point of view.…”

Section: Srp-68-01 Survey Metermentioning

confidence: 99%

Thyroid doses in Ukraine due to 131I intake after the Chornobyl accident. Report I: revision of direct thyroid measurements

Masiuk

Chepurny

Buderatska

et al. 2021

Radiat Environ Biophys

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The increased risk of thyroid cancer among individuals exposed during childhood and adolescence to Iodine-131 ( 131 I) is the main statistically significant long-term effect of the Chornobyl accident. Several radiation epidemiological studies have been carried out or are currently in progress in Ukraine, to assess the risk of radiation-related health effects in exposed populations. About 150,000 measurements of 131 I thyroid activity, so-called 'direct thyroid measurements', performed in May-June 1986 in the Ukrainian population served as the main sources of data used to estimate thyroid doses to the individuals of these studies. However, limitations in the direct thyroid measurements have been recently recognized including improper measurement geometry and unknown true values of calibration coefficients for unchecked thyroid detectors. In the present study, a comparative analysis of 131 I thyroid activity measured by calibrated and unchecked devices in residents of the same neighboring settlements was conducted to evaluate the correct measurement geometry and calibration coefficients for measuring devices. As a result, revised values of 131 I thyroid activity were obtained. On average, in Vinnytsia, Kyiv, Lviv and Chernihiv Oblasts and in the city of Kyiv, the revised values of the 131 I thyroid activities were found to be 10-25% higher than previously reported, while in Zhytomyr Oblast, the values of the revised activities were found to be lower by about 50%. New sources of shared and unshared errors associated with estimates of 131 I thyroid activity were identified. The revised estimates of thyroid activity are recommended to be used to develop an updated Thyroid Dosimetry system (TD20) for the entire population of Ukraine as well as to revise the thyroid doses for the individuals included in post-Chornobyl radiation epidemiological studies: the Ukrainian-American cohort of individuals exposed during childhood and adolescence, the Ukrainian in utero cohort and the Chornobyl Tissue Bank.

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Section: Srp-68-01 Survey Metermentioning

confidence: 99%