At 26 minutes, when Royston shows his colleague Peter an exploded jar of tritium, he asks him how long it will remain radioactive. Peter guesses 30 years. Royston says that's close: it's 28 years. Tritium has a half-life of 12.3 years which means that in 28 years it will still retain 20.6% of its radioactivity. After 100 years, only 0.4% will be left, but it would still be detectable.

Film

X contro il centro atomico (1956)

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