http://www.nytimes.com/2006/11/24/world/europe/24cnd-isotope.htmlPolonium 210 Is Highly Radioactive and Toxic
If substantial large amounts of polonium 210 were used to poison Alexander Litvinenko, whoever did it presumably had access to a high-level nuclear laboratory and put himself at some risk carrying out the assassination, experts said today.
Polonium 210 is highly radioactive and very toxic. By weight, it is about 250 million times as toxic as cyanide, so a particle smaller than a dust mote — too small to see — could be fatal. Handling it is dangerous and requires special equipment.
It is also extremely rare in nature, although it occurs in uranium ores and has been found in minute quantities in tobacco and other plants. But making the “significant quantities” described the by the British Health Protection Agency would require a nuclear laboratory that could bombard bismuth with neutrons to produce the element.
“To most chemists, this is astonishing,” said Dr. Andrea Sella, a lecturer in inorganic chemistry at London’s University College. “This is not available commercially.
“This is not the kind of weapon that any kind of amateur could construct,” he added. “It would require real resources to do it.” “
Officials also worried about doing autopsy:
http://www.wlbz2.com/news/article.aspx?storyid=46130Now that British officials have determined that a former Russian spy was poisoned with a radioactive substance, they're wondering if it's safe to perform an autopsy.
Meanwhile, police and military radiation experts are searching several locations in London, including the sushi bar where Alexander Litvinenko ate before becoming ill, and his house. Police say traces of radiation have been found at both locations, as well as a hotel he visited.