Memory Alpha
Memory Alpha
Multiple realities
(covers information from several alternate timelines)

Christopher Pike being affected by critical levels of radiation

Delta radiation was a highly energetic release of electromagnetic particles which could be extremely dangerous with prolonged exposure. Delta radiation could be created by the warp cores of Federation starships and some natural astronomical phenomena. Exposure to intense delta radiation could lead to cellular disruption, and weaken metals such as viterium. (ENT: "Daedalus"; DS9: "Valiant")

In 2153, Commander Tucker and Doctor Phlox determined that the organic power cells in Xindi-Reptilian rifles could be neutralized by delta radiation, raising the possibility of using portable EM emitters to disable the Xindi weapons. (ENT: "The Shipment")

Cumulative effects of exposure to delta rays

In the mirror universe, ISS Enterprise's warp core produced dangerous amounts of delta rays, causing noticeable disfigurement to Chief Engineer Charles Tucker III. Tucker noted that for every year of exposure to the warp core, one lost ten years off one's life expectancy. (ENT: "In a Mirror, Darkly")

In the late 2260s, Fleet Captain Christopher Pike was on an inspection tour of a cadet vessel, an old class J starship, when one of the baffle plates ruptured and caused a radiation leak. Pike went in and managed to bring out all cadets who were still alive, but was badly affected by delta rays himself and left permanently crippled. (TOS: "The Menagerie, Part I"; DIS: "Through the Valley of Shadows")

In 2369, Doctor Julian Bashir exposed a sample of the aphasia virus, grown on triagar solution, to a delta ray field at 120 millivolts. (DS9: "Babel")

The same year while on a rescue mission for the runabout USS Yangtzee Kiang, Jadzia Dax noted that the data from the long range sensors might be inaccurate because of an abnormal level of delta radiation from the star in a binary star system. (DS9: "Battle Lines")

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