Uranserie
Uranserie, or the uranium decay series, refers to natural chains of radioactive decay that originate from long-lived isotopes of uranium and thorium and progress until a stable lead isotope is formed. In geology and geochemistry, three primary series are recognized: the uranium-238 series (the radium series), the uranium-235 series (the actinium series), and the thorium-232 series (the thorium series). Each series consists of a sequence of alpha and beta decays, with occasional short-lived gaseous intermediates such as radon.
The 238U series begins with uranium-238 and decays through a succession of radionuclides such as 234U, 226Ra,
The 235U series starts at uranium-235 and proceeds through daughter nuclides including protactinium-231 and other intermediates
The 232Th series begins with thorium-232 and progresses to 208Pb via a sequence of intermediates such as
Natural occurrence includes minerals like uraninite and thorite. The decay chains are exploited in geochronology, groundwater