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'