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Natural uranium (NU or U nat [1]) is uranium with the same isotopic ratio as found in nature. It contains 0.711% uranium-235, 99.284% uranium-238, and a trace of uranium-234 by weight (0.0055%).
The fraction 99 / 70 (≈ 1.4142857) is sometimes used as a good rational approximation with a reasonably small denominator. Sequence A002193 in the On-Line Encyclopedia of Integer Sequences consists of the digits in the decimal expansion of the square root of 2, here truncated to 65 decimal places: [ 2 ]
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.
A satellite whose orbital period is an integer fraction of a day (e.g., 24 hours, 12 hours, 8 hours, etc.) will follow roughly the same ground track every day. This ground track is shifted east or west depending on the longitude of the ascending node , which can vary over time due to perturbations of the orbit.
very much because the Bremsstrahlung fraction is low, but it will push the other fuels into regimes where the power density relative to 2 1 D – 3 1 T is even lower and the required confinement even more difficult to achieve. For 2 1 D – 2 1 D and 2 1 D – 3 2 He, Bremsstrahlung losses will be a serious, possibly prohibitive problem. For 3 ...
Although 234 U, despite its much lower mass fraction, contributes more to the activity, the target isotope for nuclear industry use is 235 U. Therefore, the degree of uranium enrichment or depletion is specified by the content of 235 U. The reduction of 234 U, and to a slight degree 235 U, content reduces the radioactivity below unenriched UF 6.
Kepler-56b is about 0.1028 AU (9.56 million mi; 15.38 million km) away from its host star [1] (about one-tenth of the distance between Earth to the Sun), making it even closer to its parent star than Mercury (0.39 AU [36 million mi; 58 million km]) and Venus (0.72 AU [67 million mi; 110 million km]).
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