Search results
Results From The WOW.Com Content Network
About 6 MeV of the fission-input energy is supplied by the simple binding of an extra neutron to the heavy nucleus via the strong force; however, in many fissionable isotopes, this amount of energy is not enough for fission. Uranium-238, for example, has a near-zero fission cross section for neutrons of less than 1 MeV energy.
Fission, in biology, is the division of a single entity into two or more parts and the regeneration of those parts to separate entities resembling the original. The object experiencing fission is usually a cell , but the term may also refer to how organisms , bodies, populations , or species split into discrete parts.
The fission process often produces gamma rays and releases a very large amount of energy, even by the energetic standards of radioactive decay. Scientists already knew about alpha decay and beta decay , but fission assumed great importance because the discovery that a nuclear chain reaction was possible led to the development of nuclear power ...
Neutron radiation is a form of ionizing radiation that presents as free neutrons.Typical phenomena are nuclear fission or nuclear fusion causing the release of free neutrons, which then react with nuclei of other atoms to form new nuclides—which, in turn, may trigger further neutron radiation.
Fission product: most significant short-term health hazard from nuclear fission, used in nuclear medicine, industrial tracer Xenon-135: 54: 81: 9.1 h: β −: 1160 Fission product: strongest known "nuclear poison" (neutron-absorber), with a major effect on nuclear reactor operation. Caesium-137: 55: 82: 30.2 y: β −: 1176 Fission product
The fission process can be understood when a nucleus with some equilibrium deformation absorbs energy (through neutron capture, for example), becomes excited and deforms to a configuration known as the "transition state" or "saddle point" configuration. As the nucleus deforms, the nuclear Coulomb energy decreases while the nuclear surface ...
Examples include binary fission, mitosis, and meiosis. cell membrane The semipermeable membrane surrounding the cytoplasm of a cell. cell nucleus The "control room" for the cell. The nucleus gives out all the orders. cell plate Grown in the cell's center, it fuses with the parental plasma membrane, creating a new cell wall that enables cell ...
To be a useful fuel for nuclear fission chain reactions, the material must: Be in the region of the binding energy curve where a fission chain reaction is possible (i.e., above radium) Have a high probability of fission on neutron capture; Release more than one neutron on average per neutron capture.