1957/09/15 by T. A. Eastwood, John Butler, M.J. Cabell +4 · 1 citation
Physics and Astronomy · Materials Science · Engineering · #Nuclear Physics and Applications #Nuclear Materials and Properties #Nuclear reactor physics and engineering
paper · doi:10.1103/physrev.107.1635
openalex publication_date 1957/09/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
Samples of berkelium and californium have been separated from neutron-irradiated plutonium and carefully purified. Pure Cf249 daughter has been separated from the Bk249. The californium sample and its curium decay products have been mass analyzed. The berkelium fraction contained 314\ifmmode±\else\textpm\fi8 day Bk249 emitting 0.114\ifmmode±\else\textpm\fi0.015 Mev beta particles and 5.417\ifmmode±\else\textpm\fi0.015 Mev and 5.03\ifmmode±\else\textpm\fi0.03 Mev alpha particles. The \ensuremathα\ensuremath-\ensuremathβ ratio was found to be (2.2\ifmmode±\else\textpm\fi0.3)\ifmmode×\else\texttimes\fi10^\ensuremath-5. The californium sample contained: 360\ifmmode±\else\textpm\fi40 year Cf249 emitting 5.808\ifmmode±\else\textpm\fi0.010, 5.93\ifmmode±\else\textpm\fi0.02, and 6.20\ifmmode±\else\textpm\fi0.02 Mev alpha particles; 10.9\ifmmode±\else\textpm\fi0.8 year Cf250 emitting 6.020\ifmmode±\else\textpm\fi0.010 Mev alpha particles; 800-year Cf251; 2.55\ifmmode±\else\textpm\fi0.15 year Cf252 emitting 6.112\ifmmode±\else\textpm\fi0.015 Mev alpha particles; and 17\ifmmode±\else\textpm\fi1 day Cf253.