Word: tritium
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...ordinary water (H2O) were thoroughly mixed, the dilution of the heavy water would show the body's total water volume. All this was easier said than done; it took 2½ years to get results that satisfied Moore's meticulous demands. Today, with the aid of radioactive tritium and an ultramodern scintillation counter, the job can be done in minutes...
Scientists have discovered a quantity of tritium, a radioactive variation of the hydrogen atom, on the capsule of Discoverer 17. Normally most tritium is lost in the atmosphere...
...Calif, the satellite encountered radiation from an intense solar flare within a few hours. The capsule from the satellite was recovered off Hawaii two days later. The solar flare--a vast magnetic storm or explosion on the sun's surface--had caused a great increase in the amount of tritium in the earth's upper atmosphere...
Smithsonian scientists said they found more than 100 times the amount of tritium imbedded near the surface of the capsule than they would normally expect in a satellite making a similar orbit during a period of no flares...
...Tritium is produced when great solar explosions cause hydrogen and helium to combine at energies of over a million electron volts. The effect can be duplicated on earth with a cyclotron...