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- W2015217097 abstract "Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan [email protected] * The only naturally occurring isotope of cesium is 133Cs. The 137Cs radionuclide is produced in the fission process. Indeed, 137Cs possesses a high fission product yield of approximately 6.1% in 235U fission (Reactor Physics Constants 1963). Neutron reactions can, in principle, produce 137Cs in naturally occurring isotopes by two reactions, namely 136Xe(n,γ) and 137Ba(n,p). The relative isotopic abundance of naturally occurring 136Xe and 137Ba is 8.87% and 11.32%, respectively. However, the following three factors must be considered in estimating the production of 137Cs by these two processes in the black rain specimens used by Fujikawa et al. (2003): The elemental abundance of Ba in the natural environment is very low and that of Xe is extremely low. The neutron cross sections of both these reactions are small. The neutron fluence from Little-Boy at the location of these black rain specimens, r = 3,700 m, is at least eight or more orders of magnitude lower than the neutron fluence at the hypocenter. Hence, 137Cs production by neutron reactions in these black rain specimens is many orders of magnitude smaller than the results observed by Fujikawa et al. (2003) and can therefore be completely ignored. Since 234U possesses a natural abundance of 0.0054%, 235U can be produced in the ground-level Hiroshima environment by neutron capture in 234U. However, 235U can also be destroyed in the ground-level Hiroshima environment by neutron reactions in naturally occurring 235U. In fact, 235U possesses a higher natural abundance as well as a larger neutron absorption cross section than 234U. While both these production and destruction processes are each completely negligible, it is clear that neutron reactions in the ground-level Hiroshima environment would destroy more 235U than would be created." @default.
- W2015217097 created "2016-06-24" @default.
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- W2015217097 date "2003-07-01" @default.
- W2015217097 modified "2023-10-14" @default.
- W2015217097 title "RESPONSE TO GOLD" @default.
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- W2015217097 doi "https://doi.org/10.1097/00004032-200307000-00020" @default.
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