Plutonium is a synthetic actinide element (atomic number 94) that plays a central role in nuclear science and technology topics, particularly due to its fissile and fertile isotopes. The isotope plutonium-239 is critical for nuclear weapons and as reactor fuel because it undergoes efficient neutron-induced fission, while isotopes such as plutonium-240 and -241 strongly influence neutron economy, decay heat, and radiotoxicity. Research topics involving plutonium encompass its complex electronic structure, multiple oxidation states, unusual phase behavior in metal and compounds, long-term behavior in nuclear waste forms, and environmental transport and remediation challenges arising from its alpha radioactivity and chemical speciation.
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