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Uranium-235 (235 U or U-235) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a nuclear chain reaction. It is the only fissile isotope that exists in nature as a primordial nuclide. Uranium-235 has a half-life of 703.8 million years.
This required uranium-235 (U 235), the fissionable isotope of uranium. However, the vast majority of uranium mined from the ground is uranium-238 , while only 0.7% is U 235 . Scientists developed several processes for separating the isotopes of uranium, including electromagnetic separation and gaseous diffusion.
The three long-lived nuclides are uranium-238 (half-life 4.5 billion years), uranium-235 (half-life 700 million years) and thorium-232 (half-life 14 billion years). The fourth chain has no such long-lasting bottleneck nuclide near the top, so almost all of the nuclides in that chain have long since decayed down to just before the end: bismuth-209.
This is when uranium glass reached the height of its popularity in the United States between 1958 and 1978, with more than 4 million pieces of decorative uranium produced, according to Oak Ridge ...
Uranium-235 makes up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction. It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature. Uranium-235 has a half-life of 703.8 million years.
The photos, published by North Korea's official Korean Central News Agency, show Kim walking past rows of centrifuges and being briefed by military officials and scientists at the Nuclear Weapons ...
The radiation source within the Godiva device was a fissile metallic mass (usually highly enriched 235 U), [3] about 11.8 inches (30 cm) in diameter. This was located at the top of a 6.5-foot (2 m) high metal tower.
New pictures of North Korean leader Kim Jong Un touring what state media said is a uranium enrichment facility have given an extremely rare glimpse inside the isolated nation’s closely guarded ...