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铀在自然界地壳中的含量一般约为2.7×10-6,在海水中含量一般约为3.0×10-6。自然界中236U产生的途径主要来源于235U被中子辐照后的产物。236U在自然界的含量极微,236U/238U的原子比
The content of uranium in the earth’s crust is generally about 2.7 × 10-6, and the content in seawater is generally about 3.0 × 10-6. 236U produced in nature mainly comes from the 235U neutron irradiation products. 236U content in nature is minimal, 236U / 238U atomic ratio