Radioactive dating after 2 half lives

15 Jul

It is similar to positron decay in that the nucleus transforms to a daughter of one lower atomic number.

In the latter case, gamma emission may occur as the excited states transform to lower energy states of the same nucleus.The law of conservation of angular momentum requires that the sum of angular momenta of the radiation and daughter nucleus is equal to the angular momentum (spin) of the parent.If the spins of initial and final states differ by more than one, dipole radiation is forbidden, and gamma emission must proceed more slowly by a higher multipole (quadrupole, octupole, etc.) gamma transition.Consistent values for all materials with the exception of our HU-1 solution support the secular equilibrium status.The new half-lives agree within error with previously determined values; however, errors in our values are generally smaller than those in the earlier determinations.