2014/12/24 by E. B. Norman, Eric B. Norman, Keenan J. Thomas +5 · 1 voice
Environmental Science · Physics and Astronomy · #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Radioactive Decay and Measurement Techniques #Radioactive contamination and transfer #nucl-ex #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1412.7590
openalex publication_date 2014/12/24 · arxiv published 2014/12/24 · arxiv created 2015/02/17 · arxiv updated 2015/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Passive x-ray and gamma-ray analysis was performed on UC Berkeley's EH&S Sample S338. The object was found to contain Pu-239 and no other radioactive isotopes. The mass of Pu-239 contained in this object was determined to be 2.0 +- 0.3 micrograms. These observations are consistent with the identification of this object being the 2.77-microgram plutonium oxide sample described by Glenn Seaborg and his collaborators as the first sample of Pu-239 that was large enough to be weighed.