Internal dose monitoring and risk assessment of workers and members of the public following an accidental release from European Spallation Source (ESS)

Project: Research

Project Details

Description

General purpose: Consequence assessments of an accidental release from the European Spallation source (ESS) show that workers present on-site and subjects in the vicinity of the ESS plant may be affected by interna! contamination of especially alpha emitting 148Gd and gamma emitters such as 187W, 172Hf, 182Ta including also radioiodine such as 1251. The objective of the proposed PhD project is to investigate which radiometric measurements need to be conducted to predict, monitor and follow-up the interna! doses from accidentally released target particles from ESS to workers and to members of the public.
Method: Given prior observations on experimental particle size distribution and simulated target nuclide inventory calculations, the PhD student will in the first phase estimate the age and gender dependent variability in nuclide specific individual inhalation doses from the release plume. A first paper will present these results together with a suggestion of principal radiometry methods required for accurate individual dose assessments. In the next step simulated gamma spectra from exposed subjects for typical set of low background whole-body counting systems will be made using existing simulations tools. Limitations and potentials of the existing assessment methods will be compared. Based on these simulations the feasibility of alternative assessment methods using indirect quantification by means of trace nuclides will be made. By using recently updated biokinetic medels corresponding gamma spectra from excretion sampling from exposed subjects will be simulated as well. Detection limits of nuclide specific interna! dose from ESS target particles, also exploiting urine-to-fecal ratios to characterize mode of intake, will be computed and presented in a third paper. In the last phase of the PhD program, a theoretical sensitivity analysis of the variations i terms of particle size, intake mode, age, gender will identify the crucial steps in the assessment chain for accurate quantification of individual interna! dose, and presented in a forth paper. Limitations and potentials of the existing assessment methods (direct radionuclide measurements) will be compared, and the feasibility of new and alternative assessment methods using indirect quantification by means of trace nuclides will be elaborated in more detail in the final PhD thesis. Lund University will co-finance the project with 500 kkr.
StatusActive
Effective start/end date2021/09/012025/11/15

Keywords

  • ESS, internal dosimetry