Search results
Results From The WOW.Com Content Network
Thorium (90 Th) has seven naturally occurring isotopes but none are stable. One isotope, 232 Th, is relatively stable, with a half-life of 1.405×10 10 years, considerably longer than the age of the Earth, and even slightly longer than the generally accepted age of the universe.
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
All known thorium isotopes are unstable. The most stable isotope, 232 Th , has a half-life of 14.05 billion years, or about the age of the universe ; it decays very slowly via alpha decay , starting a decay chain named the thorium series that ends at stable 208 Pb .
Pages in category "Isotopes of thorium" ... Thorium-239 This page was last edited on 29 March 2013, at 11:09 (UTC). Text is available under the Creative ...
Thorium-232 (232 Th) is the main naturally occurring isotope of thorium, with a relative abundance of 99.98%. It has a half life of 14.05 billion years, which makes it the longest-lived isotope of thorium. It decays by alpha decay to radium-228; its decay chain terminates at stable lead-208.
220 Rn, also called thoron, is a natural decay product of the most stable thorium isotope (232 Th). It has a half-life of 55.6 seconds and also emits alpha radiation . Similarly, 219 Rn is derived from the most stable isotope of actinium ( 227 Ac)—named "actinon"—and is an alpha emitter with a half-life of 3.96 seconds.
For premium support please call: 800-290-4726 more ways to reach us
With a half-life of 0.8 seconds, the next most stable known isotope is 270 Mt. [3] The isotopes 276 Mt and 274 Mt have half-lives of 0.62 and 0.64 seconds respectively. [ 4 ] The isotope 277 Mt, created as the final decay product of 293 Ts for the first time in 2012, was observed to undergo spontaneous fission with a half-life of 5 milliseconds.