21. All fission reactions necessarily generate fission products, the radioactive remains of the atomic nuclei split by the fission reactions . 22. Since 1996 he has been involved in a project on incineration of nuclear waste by spallation and fission reactions . 23. On 16 March, Korea was reported to be sending boron for the production of boric acid to dampen fission reactions . 24. The air samples were analyzed for the presence of specific isotopes of krypton and xenon, unambiguous markers of fission reactions . 25. Decay heat, while dangerous and strong enough to melt the core, is not nearly as intense as an active fission reaction . 26. The page protection is the inanimate carbon rod that governs his fission reaction , and it'll drop shortly along with the block. 27. Milan Nebesar, a spokesman for the Temelin nuclear plant, said fission reaction at the second unit's reactor was restarted late Wednesday. 28. The new tests mark the first time Temelin's operators started the nuclear fission reaction in the plant's second of two reactors. 29. When a thermal neutron is absorbed by a lithium-6 nucleus, it causes a fission reaction that produces helium, tritium and energy. 30. The reactor will be cooled down to 60 degrees Celsius ( 140 F ) and the fission reaction interrupted later tonight,
