Chronon radiation
From Tardis Wiki, the free Doctor Who reference
Chronon radiation was a form of radiation that was linked to temporal anomalies. Magnus Greel's arrival in the time cabinet in the 1800s via a zygma beam caused massive discharges of chronon radiation which flowed along the Earth's telluric currents, forming the Dragon Paths.
The segments of the Key to Time were traced by the chronon radiation they gave off. (PROSE: The Shadow of Weng-Chiang)