Captain Planet and the Planeteers (1990)

S3E3 The Deadly Glow

The Planeteers are on a tight schedule to locate a radioactive isotope that spilled from two capsules of an outdated chemotherapy device. However, Duke Nukem is already in possession of one of the capsules. The team must race against time to locate the two young kids who have the second capsule before Nukem can get to them.