Publications by authors named "H Tatsuzaki"
Accidental inhalation intake of plutonium isotopes and 241Am occurred at a Pu research facility in Japan in 2017, and the five workers involved in this accident were treated by the administration of Ca/Zn-diethylenetriaminepentaacetic acid (DTPA). For the worker who was most internally exposed, the therapy was continued over 1 y after the accident. Urinary samples collected before and after each administration were subject to bioassay to evaluate the efficacy of the dose reduction.
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- - Seven nuclear workers exposed to radionuclides, especially I-131, during the Fukushima accident in March 2011 were evaluated at the National Institute of Radiological Sciences over a 10-year follow-up period.
- - They received estimated thyroid doses ranging from 3.2 to 1.2 × 10 Sv but reported no symptoms of abnormal thyroid function.
- - Despite no immediate health issues or abnormalities detected in tests, ongoing monitoring of their thyroid status is recommended for the future.
In Japan, the radiation-dose limit for the lens of the eye was revised in April 2021. Consequently, for workers, the numerical values of the equivalent dose to the lens of the eye are equal to those of the effective dose. Radiation workers, radiation safety officers and licensees must comply with regulations related to radiation protection and optimize protection.
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- The assessment of thyroid radiation doses for Fukushima residents after the 2011 nuclear accident is crucial but challenging due to limited direct data, with only about 1,300 iodine (I) measurement points available from post-accident screenings.* -
- Researchers reassessed doses for 1,080 individuals aged 15 or younger using updated conversion factors, finding that most thyroid doses were less than 30 mSv, indicating a similar iodine intake across different age groups in three municipalities.* -
- Results revealed that despite varying iodine concentrations in tap water, the thyroid doses for residents in Iitate Village and Iwaki City were comparable, suggesting ingestion was the main intake route rather than inhalation, although the exact intake method remains
Article Synopsis
- * Researchers conducted numerical simulations using individual voxel phantoms based on MRI scans of six of the seven workers, focusing on their thyroid sizes which were generally smaller than standard reference values.
- * The study found that individual thyroid size significantly impacts dose estimation, with results showing absorbed doses could vary widely, and confirmed the accuracy of direct thyroid measurements from the National Institute for Radiological Sciences.