| 21. | These isotopes emit almost no ?-radiation, but undergo spontaneous fission with the associated emission of neutrons.
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| 22. | Most designs need enriched fuel so that there are more spontaneous fissions to act a seeds.
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| 23. | Spontaneous fission is feasible over practical observation times only for atomic masses of 232 amu or more.
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| 24. | Plutonium-240 exhibits a high rate of spontaneous fission, raising the neutron flux of any sample containing it.
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| 25. | Thorium-232 is the lightest primordial nuclide that has left evidence of undergoing spontaneous fission in its minerals.
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| 26. | Element 41 ( niobium ) is theoretically unstable via spontaneous fission, but this has never been detected.
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| 27. | It was also found that some heavy elements may undergo spontaneous fission into products that vary in composition.
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| 28. | :Spontaneous fission is far too unreliable.
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| 29. | Spontaneous fission ends up with a probabilistic distribution of daughter products, which sets it apart from cluster decay.
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| 30. | Mercury-180, producible from thallium-180, was found in 2010 to be capable of an unusual form of spontaneous fission.
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