Pb 210 dating wiki
Significant amounts were released into the atmosphere as a result of nuclear weapons testing in the 1950s and 1960s.
It is also naturally produced in small quantities, due to the spontaneous fission of natural uranium, by cosmic ray spallation of trace levels of xenon in the atmosphere, and some by cosmic ray muons striking tellurium-130.
This supernova source may also have caused collapse of the solar gas cloud.However, it is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239.U cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission of one or more next-generation nuclei is probable.DUCRETE, a concrete made with uranium dioxide aggregate instead of gravel, is being investigated as a material for dry cask storage systems to store radioactive waste. Surplus highly enriched uranium can be downblended with depleted uranium or natural uranium to turn it into low enriched uranium suitable for use in commercial nuclear fuel.