The increase in brightness of the x-ray sources over the same period has occurred far faster.

在同一时期内，X 射线光源亮度的增加速度要快得多。

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Most of the bright X-ray sources are young stars.

大部分明亮的X射线都源自新生的恒星。

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Chandra detects and images X-ray sources that are billions of light years away.

钱德拉能检测和成像数十亿光年之遥的X射线源。

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There are, however, no interference problems with field-emission X-ray sources, so these can be used to take high-resolution pictures while treatment is proceeding.

ECONOMIST: Modern X-ray technology

Most diffuse X-ray sources in the Universe have a characteristic temperature because they represent the residual radiation from an event, such as a supernova.

BBC: Arches Cluster, Leicester

What we have done is produce highly compact neutron generators which could conceivably be useful for handheld cameras or tiny X-ray sources that could be put into the body to deliver X-rays locally to destroy tumours.

BBC: NEWS | Science/Nature | Table-top fusion 'demonstrated'