The worker 's cumulative radiation exposure was 0.5 millisievert, far below the legal limit.

这名工作人员累积辐射剂量为0.5毫西弗，远低于法定上限。

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Conclusions Imaging procedures are an important source of exposure to ionizing radiation in the United States and can result in high cumulative effective doses of radiation.

结论：在美国，影像操作是一个重要的电离辐射暴露来源，并可导致较高的辐射累积有效剂量。

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Start using it now to reduce your cumulative lifetime exposure to damaging UV radiation.

现在开始擦防晒霜，它可以减少紫外线的累积损害。

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