Sun radiometric dating
Shortly thereafter, Glenn Seaborg, Joseph Kennedy, Arthur Wahl, and Mc Millan made the element plutonium by bombarding uranium targets with deuterons, particles derived from the heavy isotope of hydrogen, deuterium ( H). Division of Nuclear Chemistry and Technology of the American Chemical Society.
Both Mc Millan and Seaborg recognized that the chemical properties of neptunium and plutonium did not resemble those of rhenium and osmium, as many had predicted, but more closely resembled the chemistry of uranium, a fact that led Seaborg in 1944 to propose that the transuranic elements were part of a new group of elements called the actinide series that should be placed below the lanthanide series on the periodic chart.
There are essentially three sources of radioactive elements.
Primordial nuclides are radioactive elements whose half-lives are comparable to the age of our solar system and were present at the formation of Earth.
In 1911 Ernest Rutherford asked a student, George de Hevesy, to separate a lead impurity from a decay product of uranium, radium-D.Diagnosis involves use of the radiopharmaceutical to generate an image of the tumor or organ to identify problems that may be missed by x rays or physical examinations. Treatment involves using radioactive compounds at carefully controlled doses to destroy tumors. As early as 1907 Bertram Boltwood had used the discovery of radioactive decay laws by Ernest Rutherford and Frederick Soddy to ascribe an age of over two billion years to a uranium mineral. Rydberg, J.; Liljenzin, J.-O.; and Choppin, Gregory R. In 1947 Willard Libby at the University of Chicago used the decay of C decays at a known rate, enabling a date for the carbon-containing relic to be calculated.