Slashdot Mirror
UK Lab Traces Polonium To Russian Nuclear Plant
reporter writes "British authorities had identified polonium 210 to be the radioactive poison that killed Alexander Litvinenko, the former Russian spy who defected to Great Britain. Now, according to a disturbing report, the authorities have identified the source of the poison to be Russia. Bloomberg ominously reports, 'Scientists at the U.K.'s Atomic Weapons Establishment in Aldermaston, west of London, have traced the polonium 210 found in London to a nuclear power plant in Russia, the capital's Evening Standard newspaper reported today. Officials at the establishment didn't return calls.' A cold chill just fell on relations between Russia and the West." In another twist to this developing story, the shadowy Italian security consultant who dined with Litvinenko has also fallen ill with radiation poisoning.
Not sure exactly what you meant to ask, but here goes.
Alpha radiation can't penetrate skin. So superficial contact with an alpha emitter isn't really a concern. OTOH, if you ingest/inhale an alpha emitter (like polonium 210), then your internal organs can be exposed to it. This, obviously, is a bad thing. In polonium's case, IIRC, it's soluble in bodily tissues, and has a very short half life of 138 days, so it's quite dangerous (remember that half life and radioactivity are inversely linked).
Beta, gamma and neutron radiation are somewhat different. Those can get through skin, so superficial contact is a potential concern. Beta is blocked by aluminum foil (get out your tinfoil hats!), gamma and neutron require denser materials such as lead, or thicker, less dense materials like deep soil. Neutron radiation has the added hazard of neutron activation (it can render previously safe materials radioactive).
Additionally, ionizing radiation from sources other than radioactive decay, like X-rays and UV, can generally be bad for your health; these can be seen as less serious than gamma radiation, but more serious than alpha (UV is blocked by sunblock for example). Non ionizing radiation is de facto harmless, barring intensities severe enough to cause thermal burns.
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Polonium 210 has a half life of only 138 days. To have enough survive from the cold war era that they'd still have lethal amounts is far fetched at best. Wikipedia link on Polonium 210
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