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Please forward this error screen to 216. This is a featured article. Click here for more information. This article is about the radioactive element.

An informal name for plutonium, plute, is derived from this name as well. Wartime secrecy prevented them from announcing the discovery until 1948. Plutonium is the element with the highest atomic number to occur in nature. Trace quantities arise in natural uranium-238 deposits when U-238 captures neutrons emitted by decay of other U-238 atoms. Plutonium isotopes are expensive and inconvenient to separate, so particular isotopes are usually manufactured in specialized reactors. Heat produced by the deceleration of these alpha particles makes it warm to the touch. The resistivity of plutonium at room temperature is very high for a metal, and it gets even higher with lower temperatures, which is unusual for metals.

Resistivity then begins to increase with time at around 20 K due to radiation damage, with the rate dictated by the isotopic composition of the sample. Because of self-irradiation, a sample of plutonium fatigues throughout its crystal structure, meaning the ordered arrangement of its atoms becomes disrupted by radiation with time. Unlike most materials, plutonium increases in density when it melts, by 2. The densities of the different allotropes vary from 16. The presence of these many allotropes makes machining plutonium very difficult, as it changes state very readily. For example, the α form exists at room temperature in unalloyed plutonium. The reasons for the complicated phase diagram are not entirely understood.

The δ form has more typical metallic character, and is roughly as strong and malleable as aluminium. The longest-lived are plutonium-244, with a half-life of 80. 8 million years, plutonium-242, with a half-life of 373,300 years, and plutonium-239, with a half-life of 24,110 years. All of the remaining radioactive isotopes have half-lives that are less than 7,000 years. Plutonium-238 and 239 are the most widely synthesized isotopes.

In this process, a deuteron hitting uranium-238 produces two neutrons and neptunium-238, which spontaneously decays by emitting negative beta particles to form plutonium-238. Different isotopes produce different amounts of heat per mass. Even in small amounts can cause significant self-heating. The principal fissile isotope in use. High spontaneous fission hinders use in nuclear weapons.

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