Thoron progeny

Short-lived radioactive decay products of radon-220. In the context of thoron exposure, the following progeny are important: Po-216, Pb-212, Bi-212, Po-212, Tl-208. Sometimes also called 'Radon-220 progeny'.

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from ICRP Publication 115, 2010

The decay products of radon-220, used herein in the more limited sense of the short-lived decay products from polonium-216 to polonium-212 or thallium-208.