An anonymous reader writes "BBC new is reporting the death of the ex-Russian spy Alexander Litvinenko with a major dose of radioactive polonium-210. But nobody knows how it got there. Suspicions have fallen upon the Russian security services (who deny involvement). The task of the pathologists now is to unpick what really killed him and how it was administered. Quite what techniques they will use to solve this puzzle is unclear." From the article: "A post-mortem examination on Mr Litvinenko has not been held yet. The delay is believed to be over concerns about the health implications for those present at the examination. But Roger Cox from the HPA said a large quantity of alpha radiation emitted from polonium-210 had been detected in Mr Litvinenko's urine."