Half-life of Am241

Synthesis, characterization, and high-pressure studies of a 3D berkelium(iii) carboxylate framework material

“…Even though Cf lies beyond Bk, far less is known about its chemistry because the only available isotope, 249 Bk, suffers from the so-called odd-odd rule where both the proton number and atomic mass are odd giving rise to a lower stability and a half-life of only 330 days. 7 By comparison, 249 Cf has a half-life of 351 years and already poses significant synthetic hurdles. A calculation shows that a crystal the size of a grain of sand (75 mm cube) of o-BkF 3 8 (YF 3 structure type) needed for structural analysis would undergo over 10 8 decays per sec leading to rapid degradation, and thus early attempts to refine single crystal data on berkelium compounds failed.…”

Precise measurements of theBk97249ground state half-life and theβ−-decay end-point energy

“…The most recent nuclear data evaluation [11] adopts a single value of 330±4 d [8][9][10], while the latest edition of the Table of Isotopes recommends 320±6 d [12], based on the earlier evaluation by Schmorak [13], where only the results of Refs. [5,7] were considered, but those of Refs.…”

“…The half-life of 249 Bk has been measured in the past by several investigators [3,5,[7][8][9][10], as summarized in Table I. The most recent nuclear data evaluation [11] adopts a single value of 330±4 d [8][9][10], while the latest edition of the Table of Isotopes recommends 320±6 d [12], based on the earlier evaluation by Schmorak [13], where only the results of Refs.…”