Delta radiation is a type of radiation. Delta radiation can be very deadly and cause profound neurological damage; it is one of the only things that can kill the "eel creatures" in Xindi-Reptilian rifles. (ENT: "The Shipment") It can also be released when a J-class ship's baffle plate ruptures; Fleet Captain Christopher Pike's terrible injury occured in such an incident. (TOS: "The Menagerie, Part I")
Exposure to delta rays can also weaken metals such as viterium. (DS9: "Valiant")
- In reality, delta radiation is a particle radiation comprised of secondary electrons emitted when ionizing radiation passes through matter.