Wiktionary
x-radiation
n. X-ray radiation
Usage examples of "x-radiation".
In the end it wasn't heat that was killing them but radiation, the nasty little spike of gamma and X-radiation that had been unanticipated by Eugene Mangles and his endless mathematical projections.
The energy that resulted from the disappearance of the particles was released in the form of gamma and X-radiation, or any of thirty or so other but less important routes.
Among photons (and nothing else travels at speed-oflight) only the hardest X-radiation will get through to, passenger country and not much of that.
Solar System ice flaked into this black hole, here on the edge of the Galaxy, flaring X-radiation as it was crushed.