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The promethium in the outer envelope may be generated by the spontaneous fission of higher mass transuranic elements.
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One microgram (g) of californium-252 emits 2.3 million neutrons per second, an average of 3.7 neutrons per spontaneous fission.
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Many heavy isotopes, most notably californium-252, also emit prompt neutrons among the products of a similar spontaneous radioactive decay process, spontaneous fission.
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These occur when atoms react with natural neutrons (from cosmic rays, spontaneous fission, or other sources), or are bombarded directly with cosmic rays.
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Finally, promethium can be formed in nature as a product of spontaneous fission of uranium-238.
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He was one of the discoverers of spontaneous fission.
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Californium-249 has a relatively long half-life (352 years), weak spontaneous fission and strong -emission that facilitates its identification.
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The high spontaneous fission rate of californium-252 was observed in these samples.
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All these isotopes are characterized by high rates of spontaneous fission.
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This type of fission (called spontaneous fission) is rare except in a few heavy isotopes.
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