UK police 'know more' about substance involved in Russia spy mystery
https://www.yahoo.com/.../uk-govt-holds-urgent-meeting-poisoning-ex-russian-1000...
7 hours ago - Russian ex-spy
Sergei Skripal and his daughter collapsed on a bench after being
exposed to an unknown substance (AFP Photo/Yuri SENATOROV) ...
"Radiation poisoning tends to take tens of hours to several days to show symptoms after exposure," said Professor Malcolm Sperrin, a medical physics ...