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U.S. Transuranium and Uranium Registries Conference Contributions

Brazilian Graduate Student Conference, Cambridge, MA, March 12-13, 2016

BRASCON 2016 Dumit
Sara Dumit with her poster at BRASCON

USTUR/College of Pharmacy PhD student, Sara Dumit, gave a poster presentation at the Brazilian Graduate Students Conference (BRASCON) at Harvard University in Cambridge, MA, March 12-13, 2016. Her poster summarized her work to fit urine and lung data from USTUR case 0785 using ICRP’s biokinetic models. The next step in her research will be to develop a plutonium decorporation model. Ms. Dumit helped to organize the BRASCON meeting in her role as a recruiting coordinator.

Ms. Dumit’s BRASCON poster was also presented at WSU’s Graduate & Professional Student Association (GPSA) Research Exposition in Pullman, WA on March 25, 2016. The GPSA Research Exposition provides an opportunity for WSU graduate students from various disciplines to showcase their academic accomplishments.

Modeling Pu decorporation therapy following occupational exposure
Sara Dumit, Maia Avtandilashvili, Sergei Tolmachev

High levels of exposure to actinides can cause severe health effects. Individuals with significant internal contamination typically undergo treatment with chelating agents to accelerate urinary excretion and thus decrease radiation dose to sensitive tissues. The US Transuranium and Uranium Registries (USTUR) studies actinide biokinetics and tissue dosimetry by following up occupationally exposed workers. These studies are fundamental to improving the reliability of, and confidence in, radiation dose and risk assessment methods.

By linking radiation exposure history, bioassay results, and medical data with post-mortem measurements of actinides in the human body, we aim to develop and parameterize a biokinetic model for plutonium decorporation therapy. USTUR Case 0785 was selected for this study. This individual was exposed to plutonium via inhalation and wounds due to an explosion at his workplace, and underwent chelation treatment. Worksite personnel estimated his systemic deposition at 7,400 Bq. Bioassay and tissue analysis data from this case were evaluated using IMBA Professional Plus® software. The proposed model will be tested for various exposure scenarios.

The 239Pu whole-body activity at the time of death, estimated from tissue radiochemical analysis, was 2,777 Bq. Of these, 69.7% was deposited in the skeleton, 21.7% in the liver, and 6.5% in the respiratory tract. The results confirmed that internal deposition of plutonium was caused by inhalation and wound intake, and provided additional information on material solubility type. This information will be used for modeling decorporation therapy. The results of this project are important to further optimization of actinides decorporation treatment. [USTUR-0400-16A]