飘落到我国的微量放射性尘埃远不足以对人体构成损伤。
The radioactive dusts falling to our country is far from enough to cause damage to human health.
这些微量放射性物质达到了检出水平，我们当然能够检出极低含量的放射性。
They're trace levels but of course with radioactivity we can measure very low amounts.
这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。
These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.
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