They produced it by bombarding uranium-238 with deuterium nuclei (alpha particles). Plutonium-239 (half-life 24,110 years) is of greatest concern because it is fissionable. The different isotopes have different "half-lives" – the time it takes for one-half of a radioactive substance to decay. Plutonium-240 (Pu-240) Half-life: 6,564 years. What is it used for? Other important isotopes are plutonium-238 (half-life 87.7 years), plutonium-240 (half-life 6564 years), plutonium-241 (half-life 13 years), and plutonium-242 (half-life 3.76×10 5 years). Plutonium was first produced by Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan and Arthur C. Wohl by bombarding an isotope of uranium, uranium-238, with deuterons that had been accelerated in a device called a cyclotron.This created neptunium-238 and two free neutrons.Neptunium-238 has a half-life of 2.1 days and decays into plutonium-238 through beta decay. The only radioisotope that has consistently met the basic criteria is plutonium-238, which has a half-life of 88 years and a high power density, and has proven to be a very dependable and safe heat source on more than two dozen U.S. space missions over the past 50 years. Spent nuclear fuel from U.S. reactors contains about one percent plutonium by weight. One of the most well-known applications of half-life is carbon-14 dating. One isotope of plutonium, Pu-239, has a half-life of 24,100 years; that's the time it will take for half of the stuff to radioactively decay. The half-life of plutonium-238 is 87.7 years. This first produced neptunium-238 with a half-life of two days, and this decayed by beta emission to form element 94 (plutonium). Any plutonium that does not fission stays in the spent fuel. Plutonium was first made in December 1940 at Berkeley, California, by Glenn Seaborg, Arthur Wahl, Joseph Kennedy, and Edwin McMillan. Various uses have been found for plutonium as a source of energy. The half-life of plutonium-239 is 24,100 years. Plutonium is the heaviest primordial element in existence by virtue of its most stable isotope, plutonium-244, whose half-life of about 80 million years is just long enough for the element to be found in trace quantities in nature. The term is most commonly used in relation to atoms undergoing radioactive decay, but can be used to describe other types of decay, whether exponential or not. The half-life is the time taken by a radioactive material to decay by half the original amount. Plutonium-239 is used to manufacture nuclear weapons. Pu-240, fertile (half-life 6,560 years, alpha decay to U-236) Pu-241, fissile (half-life 14.4 years, beta decay to Am-241) Pu-242, (half-life 374,000 years, alpha decay to U-238) (Periodic tables show an atomic mass of 244 for plutonium, suggesting Pu-244 as the most stable isotope with the longest half-life – 82 million years. Plutonium's most stable isotope, plutonium-244, can last a long time. All of … To calculate the time taken for a mass of 8 kg to decay to 1 kg we use; Pu-239 has a half-life of 24,100 years and Pu-241's half-life is 14.4 years. Mode of decay: Alpha particles. The half-life of plutonium-239 is 24300 years which means it takes 24300 years to decay by half the original amount. Chemical properties: Solid under normal conditions, plutonium can form compounds with other elements. Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. Plutonium-238 is used as a heat source in nuclear batteries to produce electricity in devices such … It has a half-life of about 82 million years and decays into uranium-240 through alpha decay, according to the Jefferson Lab . Each isotope of plutonium has a different “half-life,” which is the time it takes for half of the atoms in a given sample to decay. 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