Earth to Mars In Two Weeks?

Waves writes "Scientists at Ben-Gurion University have shown that an unusual nuclear fuel could send space vehicles from Earth to Mars in as little as two weeks. Spacecraft now take between eight and 10 months to make the same trip. Instead of using Plutonium-239 or Uranium-235 The research shows a fairly rare nuclear material, americium-242m (Am-242m), when used as an extremely thin metallic film, is capable of sustaining nuclear fission at 1% of the mass of Plutonium." Interesting. But unless I'm totally mistaken, the thermal generators on spacecraft are used only for electricity, not propulsion, at the current time.