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September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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IAEA program uses radioisotopes to protect rhinos
After two years of testing, the International Atomic Energy Agency and the University of the Witwatersrand in Johannesburg, South Africa, have begun officially implementing the Rhisotope Project, an innovative effort to combat rhino poaching and trafficking by leveraging nuclear technology.
G. J. Safford, W. W. Havens, Jr., B. M. Rustad
Nuclear Science and Engineering | Volume 6 | Number 5 | November 1959 | Pages 433-440
Technical Paper | doi.org/10.13182/NSE59-A25682
Articles are hosted by Taylor and Francis Online.
The absolute value of the total neutron cross section of U235 was measured for neutrons in the energy range 0.000818 to 0.0818 ev for two types of samples, metallic foils and D2O solutions of uranium. Balanced solutions of U235O2(NO3)2 and U238O2(NO3)2 were used to determine the difference between the total cross sections of U235 and U238. This value when combined with the relatively small, known value of the total cross section for U238 gives σT(U235) = 695.0 ± 1.8 barns at 0.0253 ev. The measurements on the metallic U235 foils agreed with the measured total cross section determined from the liquid solution data to better than 1%, yielding σT(U235) = 698.7 ± 4.7 barns at 0.0253 ev. The measured value of the U235 total cross section at 0.00291 ev combined with the scattering cross section, a recent precise value of (1 + α) at 0.00291 ev, and the ratio σf (0.0253 ev)/σf (U235) = 590.8 ± 5.4 barns at the standard neutron energy of 0.0253 ev.
