On the radiotoxic 210 Po in coffee beans worldwide and the impact of roasting and brewing on its extraction into beverages: from the experiments to 210 Po content prediction.

We determined radiotoxic 210 Po in roasted coffee beans from different regions worldwide, the beverages, and tried to create the prediction model of 210 Po content based on its growth location. Additionally, the experiments on 210 Po losses and extraction were performed to describe the actual exposure to 210 Po. 210 Po concentrations in coffee beans and brews tuned out low (maximally of 0.20 Bq∙kg -1 and 2.31 Bq∙L -1 , respectively). We assessed the impact of the roasting process on 210 Po content and its losses at a maximum of 56.7%. During infusion experiments, we estimated the extraction of 210 Po to the coffee brew at a maximum of 40.6%. The amount of 210 Po in the coffee brew depended on the infusion style and water type. We calculated the effective radiation doses from the coffee drink ingestion. Coffee drinking does not contribute significantly to the annual effective radiation dose worldwide.