Usage examples (33)

• This occurs in nature, although rarely; among 12,500 ordinary oxygen atoms, one oxygen isotope is found.
• The U-235 isotope is the all-important factor making uranium an effective fuel for electric generating plants.
• In helium that occurs naturally the heavier isotope is more frequent than the lighter one by a factor of about 10 million.
• If the government doesn't accept the recommendation to build a new reactor, the other options to secure a long-term isotope supply will have to be revisited, the report...