By 1976, researchers had characterized actinocenes featuring thorium, uranium, neptunium, and plutonium, but the chemistry of heavier actinides remained largely unexplored. Related Stories ...

uranium-237, neptunium-237 and a selection of others. In true hacker fashion, he detected these with a gamma ray spectroscope he has in his spare bedroom, shielded from other sources with lead ...

small amounts of transuranics (elements heavier than uranium, such as neptunium, plutonium and americium) and fission products such as technetium-99. As a result, the depleted uranium by-product from ...

The U-239 then decayed in a two-step process, first turning into neptunium-239 (Np-239) and subsequently into Pu-239. To limit the build-up of unwanted byproducts, the reaction would be stopped after ...

By bombarding uranium-238 with deuterium nuclei (alpha particles) that had been accelerated in a cyclotron device, they were able to create neptunium-238 with a half-life of two days. The ...

The actinides include 14 metallic elements in the periodic system. They include thorium, uranium, neptunium, plutonium and americium. Atoms of these elements have have many electrons, up to more ...