Astronomers think most of the radiation in this nebula comes from the single hot and brilliant massive star just above the center of the image.

天文学家认为这个星云中大部分的辐射来自单个灼热和闪耀的大型星体，即图片中心的星体。

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Powerful radiation from the stars is sculpting the surrounding dust, creating the ring-like structure seen at the center of this frame.

强烈的辐射穿透了周围的尘埃，形成了图片上的环状结构。

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It is an interesting fact that background radiation level in the power plant is lower than in the center of Moscow.

有意思的是，电厂里的本底辐射水平低于莫斯科中心的本底辐射水平。

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The responsible section of the FDA, the Center for Devices and Radiological Health, routinely monitors the safety of a vast array of radiation-emitting products.

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"In cancer, we create free radical damage to tumor cells with treatment, and we want that, but antioxidants quench this damage, " explains Dr. Brian Lawenda, the clinical director of radiation oncology at the Naval Medical Center, in San Diego, California.

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"Probably the group of centers which were studied in this paper are more sophisticated and more aware of radiation-reduction methods than your typical center that is performing cardiac CT angiography, " he says.

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