Human beings are exposed to natural radiation on a daily basis.

人类每天都暴露在电离辐射下。

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As soon as the wormhole expands, natural radiation will enter it, and end up in a loop.

当虫洞膨胀，自然射线进入，最终形成一个循环。

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This paper reports absorbed dose rate in air for natural radiation and concentration radionuclides for food.

报导安徽省天然辐射的空气吸收剂量率和饮食中天然放射性核素的浓度。

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Dr. GERBER: It's approximately four times the natural radiation dose that we all receive annually in the Unites States, as a result from background radiation due to radon and other materials.

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The phenomenon has been known to laboratory scientists for many years: Rats exposed to slightly higher than natural doses of radiation live longer than ones with natural exposure.

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The amount is extremely small and less than 1% of all other natural sources of radiation.

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