Chroniton radiation
Chroniton radiation was a by-product contaminant of the Romulan interphase generator developed in 2368. ()

Chroniton torpedoes emitted chroniton radiation. Exposure to this radiation had also been associated with time travel. () The Orb of Time, for example, created a massive surge of chroniton radiation, when it sent the  back in time from 2373 to 2268. ()

When Kira Nerys was possessed by a Prophet on the Promenade of Deep Space 9 in 2374, it was suggested that crew flood the Promenade with chroniton radiation. Ramping up the chroniton levels slowly, the wormhole alien would be able to leave Kira's body without either getting hurt. ()

nl:Chroniton straling
Radiation
Time travel