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Neptunium has also been used in detectors of high-energy neutrons. The longest-lived isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production. This isotope, and the isotope neptunium-239, are also found in trace amounts in uranium ores due to neutron capture reactions and beta decay. [7]
Edwin Mattison McMillan (September 18, 1907 – September 7, 1991) was an American physicist credited with being the first to produce a transuranium element, neptunium.For this, he shared the 1951 Nobel Prize in Chemistry with Glenn Seaborg.
Earth Day is an annual event on April 22 to demonstrate support for environmental protection.First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) [1] including 1 billion people in more than 193 countries.
The 1990 Earth Day demonstration included efforts from about 200 million people in 141 countries, according to the Earth Day Network. Earth Day has inspired countries to start environmentally ...
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
In addition to Christmas, December holidays and observances include Hanukkah, Kwanzaa, New Year's Eve, and dozens of other celebrations and national days.
National Bison Day: First Saturday in November America Recycles Day: November 15 World Fisheries Day [175] November 21 International Jaguar Day [176] [177] November 29 International Cheetah Day [178] [179] December 4 Wildlife Conservation Day [180] December 4 World Soil Day [181] December 5 International Mountain Day: December 11 Monkey Day ...
By RYAN GORMAN Scientists may have found Planet X -- the long-rumored object believed to be larger than Earth and further from the sun than Pluto. Planet X and another object dubbed "Planet Y ...