The deduced half-life greater of 10 8 years was associated with the relative stability of the isomeric states.
2.
These two different decay modes must be associated with two isomeric states, but specific assignments are difficult due to the low number of observed events.
3.
Increasing indices, m1, m2, etc ., correlate with increasing levels of excitation energy stored in each of the isomeric states ( e . g ., hafnium-178m2 or ).