| 11. | Finally, promethium can be formed in nature as a product of spontaneous fission of uranium-238.
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| 12. | Pu-240 undergoes spontaneous fission as a secondary decay mode at a small but significant rate.
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| 13. | Detection was by spontaneous fission of the claimed parent isotope with half-life of 5 minutes.
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| 14. | Spontaneous fission has never been observed in the naturally occurring isotopes of these elements, however.
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| 15. | He discovered spontaneous fission in 1940 with Konstantin Petrzhak.
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| 16. | In both cases, they were unable to detect any spontaneous fission from nuclei of bohrium.
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| 17. | The team identified a 2.2-second spontaneous fission activity contained within a volatile chloride portraying eka-tantalum properties.
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| 18. | Spontaneous fission was discovered in 1940 by Kurchatov
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| 19. | Pu-240 has a high rate of spontaneous fission, which can cause a nuclear weapon to pre-detonate.
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| 20. | She was credited with the discovery that spontaneous fission is associated with the emission of neutrons.
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