Np, Pu... Transuranium Elements

Fourteen transuranium elements are known. Owing to the relatively rapid rate of their radioactive decay, these elements have not been retained in the earth’s crust in significant amounts. The age of the earth is about 5 × 10 9 years (yr), while the half-life (T 1/2) of the longest-lived isotopes of the transuranium elements is less than 10 7 yr. Transurane – Wikipedia

Np, Pu... Transuranium Elements | SpringerLink

Human-made radionuclides, such as transuranium elements (americium, plutonium, neptunium, curium), tritium, carbon 14, strontium 90 and some gamma  ...

Discovery of Isotopes of the Transuranium Elements with 93 Z 98 C. Fry, M. Thoennessen National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA Abstract One hundred and ve isotopes of the transuranium elements neptunium, plutonium, americium, curium, berkelium and

A silvery radioactive metallic element, neptunium is the first transuranic ... Its most stable isotope, 237Np, is a by-product of nuclear reactors and plutonium ...