Collateral contamination concomitant to the polonium-210 poisoning of Mr Alexander Litvinenko.

Mr Litvinenko died on 23 November 2006, having been poisoned with polonium-210 on 1 November, with evidence of a previous poisoning attempt during October 2006. Measurements of Po in urine samples were made for a large number of people to determine whether they may have been contaminated. In the majority of cases, measured levels were attributable to the presence of Po from normal dietary sources.