From: http://honestreporting.com/israel-daily-news-stream-11122013/2/

Dan Kaszeta is a former US Army and US Secret Service specialist on chemical, biological, and radiological defense, fisks the Swiss report on Yasser Arafat’s possible polonium poisoning. Among the issues Kaszeta raised: the report’s handling of polonium’s half-life decay, the evidence’s uncertain chain of custody, and the presence of radon gas in Arafat’s grave. What’s the big deal about radon?

Polonium is an eventual decay production of the particular isotope of Radon detected.