... 原子能级金属 reactor-grade metal; 原子浓度 atomic concentration; 原子偶极矩 atomic dipole moment; ...
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concentration atomic 原子浓度
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For example, the new EPA guide refers to International Atomic Energy Agency guidelines that suggest intervention is not necessary until drinking water is contaminated with radioactive iodine 131 at a concentration of 81, 000 picocuries per liter.
FORBES: EPA Draft Stirs Fears of Radically Relaxed Radiation Guidelines
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