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How is uranium-238 transformed into neptunium-239?
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transuranium element
Modern version of the periodic table of the elements (printable).
The transformation of uranium-238 into neptunium-239 occurs through a process of neutron capture followed by beta decay.12
The process proceeds as follows:
- Neutron Capture: A nucleus of uranium-238 absorbs a neutron, resulting in the formation of the isotope uranium-239.12
- Beta Decay: Uranium-239 is an unstable, radioactive isotope. After approximately 23.5 minutes, it undergoes negative beta decay, during which it emits a beta particle (an electron). This process converts a neutron within the nucleus into a proton, thereby increasing the atomic number from 92 to 93 and transforming the atom into neptunium-239.12
Neptunium-239 is itself unstable and will eventually undergo further beta decay to become plutonium-239.12