- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
A unique, telltale measurement of the molecular decomposition of a substance as a result of being irradiated. T'Pol and Hoshi Sato alter the signature of a canister of kemocite to make it easy to scan and track, once secreted aboard a Xindi shuttle. The trail goes awry when the signature is also found on a garbage scow.