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Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Thomas E. Stephenson and Sol Pearlstein
Nuclear Science and Engineering | Volume 32 | Number 3 | June 1968 | Pages 377-384
Technical Paper | doi.org/10.13182/NSE68-A20220
Articles are hosted by Taylor and Francis Online.
Early work ascertained that the Mn total cross section could not be fit by the Breit-Wigner single-level formula. Later work showed that a satisfactory fit below 10 keV could be achieved by the use of R-matrix analysis. Here, recent resonance data and the Breit-Wigner multilevel formula are used to fit the experimental data from 0.01 eV to 50 keV. Two bound levels and several positive energy levels are introduced in order to produce very good agreement with the measured total cross section. The parametric representation of the 55Mn cross section yields calculated values of 13.4 and 15 b for the capture 2200 m/sec cross section and resonance integral, and 1.94, 1.71, and 556 b for the thermal-bound atom, coherent-scattering cross section, and scattering resonance integral, respectively, all values being in good agreement with experiment. Qualitative agreement is obtained with polarization data.
