Jisho

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てんねん 天然
Noun
1. natural uranium
Wikipedia definition
2. Natural uraniumNatural uranium (NU) refers to refined uranium with the same isotopic ratio as found in nature. It contains 0.7 % uranium-235, 99.3 % uranium-238, and a trace of uranium-234 by weight. In terms of the amount of radioactivity, approximately 2.2 % comes from uranium-235, 48.6 % uranium-238, and 49.2 % uranium-234. Natural uranium can be used to fuel both low- and high-power reactors.
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