The Mayak Worker Dosimetry System (MWDS-2013): Internal Dosimetry Results

Area of Science:

• Occupational Health
• Radiation Dosimetry
• Radiobiology

Background:

• Mayak Production Associate (Mayak PA) workers have potential exposure to internal radiation.
• Accurate dosimetry is crucial for assessing health risks in radiation-exposed populations.
• Previous dosimetry systems may have limitations in estimating internal doses.

Purpose of the Study:

• To determine the distribution of calculated internal doses for a subset of Mayak PA workers.
• To characterize the statistical properties and uncertainty ranges of accumulated doses to various tissues.
• To compare dose estimations between the MWDS-2013 and MWDS-2008 dosimetry systems.

Main Methods:

• Analysis of monitoring data for 8043 Mayak PA workers.
• Calculation of statistical characteristics for accumulated doses to 17 tissues and organs.
• Comparison of dose estimates using MWDS-2013 and MWDS-2008 dosimetry systems.

Main Results:

• The distribution of internal plutonium lung doses in Mayak PA workers approximates a log-normal distribution.
• Accumulated doses to systemic organs showed a log-triangle distribution, with significant uncertainty ranges.
• The MWDS-2013 system generally increased median lung doses (1.8-2.7x) and decreased median systemic organ doses (1.3-1.4x) compared to MWDS-2008.

Conclusions:

• Internal plutonium doses in Mayak PA workers exhibit wide distributions and substantial uncertainties.
• The updated MWDS-2013 dosimetry system results in higher lung doses and lower systemic organ doses compared to MWDS-2008.
• These findings are critical for refining risk assessments and occupational health management for exposed workers.