INITIAL EVALUATION OF INDIVIDUAL DOSES IN THE EARLY PHASE OF A NUCLEAR REACTOR ACCIDENT BASED ON IN-VIVO MONITORING...

Area of Science:

• Nuclear Safety and Radiation Protection
• Environmental Health
• Medical Physics

Background:

• Early in-vivo monitoring is crucial for assessing population exposure after nuclear accidents.
• Existing methods often focus only on measured radionuclides, neglecting other significant exposure pathways.
• Accurate dose estimation requires considering inhalation of unmeasured radionuclides and external irradiation.

Purpose of the Study:

• To develop a methodology for converting in-vivo measurements into comprehensive dose estimations.
• To integrate data from measured radionuclides with model-based projections for unmeasured sources and external exposure.
• To provide a tool for rapid, initial assessment of individual radiation exposure levels post-accident.

Main Methods:

• Development of conversion coefficients linking in-vivo measurements to total projected doses.
• Incorporation of inhalation doses from unmeasured radionuclides into the calculation.
• Inclusion of external irradiation doses from airborne plumes and deposited radionuclides.
• Application of the methodology to simulated nuclear power plant accident scenarios.

Main Results:

• A validated methodology for calculating dose conversion coefficients from in-vivo measurements.
• Demonstration of the method's ability to account for all significant exposure sources.
• Successful application to loss-of-coolant and steam generator tube rupture accident scenarios.

Conclusions:

• The proposed methodology enables a more complete early assessment of individual radiation doses following nuclear accidents.
• This approach enhances the utility of in-vivo monitoring for public health response.
• Accurate dose assessment is vital for informed decision-making during nuclear emergencies.