Program - Brookhaven National Laboratory

Session HB Cross Section Measurements
Tuesday March 5, 2013
Room: Met West at 3:30 PM
HB 1 3:30 PM
Investigation of d- and Alpha-Induced Nuclear Reactions for the Production of
Radioisotopes of Bromine and Iodine for Medical Application
I. Spahn, M.S. Uddin, K. Breunig, B. Scholten, S.M. Qaim, H.H. Coenen
Institut für Neurowissenschaften und Medizin, INM-5: Nuklearchemie, Forschungszentrum Juelich,
D-52425 Juelich, Germany
A. Hermanne
Cyclotron Laboratory, Vrije Universiteit Brussel (VUB), B-1090 Brussels, Belgium
Reaction cross section data are of fundamental importance for accelerator based production of radionuclides.
They are mandatory for the assessment and optimization of production yields to be expected as well
as for selecting a suitable energy range with respect to undesired side-products. Whereas proton induced
nuclear reactions are most often used for production, the utilization of deuterons or alpha-particles offers
promising alternatives. In this work excitation functions for the formation of the radionuclides 75−78,82 Br
and 124 I were investigated. Although the radionuclide 124 I (T 1/2=4.18 d; Eβ+=2.13 MeV; Iβ+=22%) is an
often applied non-standard positron emitter with potent utilization also in theragnostics, some discrepancy
was found between the existing experimental data as well as between experimental data and nuclear model
calculations, especially for the formation of radioiodine in α-particle induced reactions [1,2]. Excitation
functions of (α,xn)-reactions on 98.28% enriched 123 Sb and on nat Sb were measured from 40 to 9 MeV and
compared with the calculations done using the computer code TALYS. The discrepancies in literature data
for the formation of 124 I, 125 I and 126 I were thereby solved. The nuclear reaction 123 Sb(α,3n) 124 I using an
enriched target appears to be interesting for production over the energy range of 42 to 32 MeV; its yield
being 11.7 MBq/µAh. Concerning the production of radiobromines which are attractive radionuclides for
medical application due to their advantageous chemical behavior, deuteron induced processes on selenium
may represent good alternatives to proton induced reactions. As currently very few are data available in the
literature, the corresponding cross sections for the nuclear reactions nat Se(d,xn) 75−78,82 Br were measured
in the energy range of 41 to 17 MeV using targets of elemental selenium. The produced radioactivity was
analysed non-destructively. The measurement of the short-lived 78 Br (T 1/2=6.45 min) demanded a careful
decay curve analysis due to interference from co-produced 78 As. The yields of the various products were
estimated.
[1] M.N. Aslam, S. Sudar, M. Hussain, A.A. Malik, S.M. Qaim, Appl. Radiat. Isot. 69, p. 94 (2011). [2] F.
Tarkanyi, S.Takacs, B. Kiraly, F. Szelecsenyi, l. Ando, J. Bergman, S.-J. Heselius, O. Solin, A. Hermanne,
Yu.N. Shubin, A.V. Ignatyuk, Appl. Radiat. Isot. 67, p. 1001 (2009).
HB 2 4:00 PM
Nuclear Data for 227 Ac Production Below 200 MeV by Proton Bombardment of Thorium
J.W. Weidner
Air Force Institute of Technology, 2950 Hobson Way, Wright-Patterson Air Force Base, OH 45433 USA
B.D. Ballard, J.W. Engle, L. Hudston, S.G. Mashnik, K.D. John, E.R. Birnbaum, F.M.Nortier
Los Alamos National Laboratory, Los Alamos, NM 87545 USA
Nuclear cross section data for the production of 227 Ac were measured at Los Alamos National Laboratory
by bombarding thin, stacked thorium foils with protons at 12 energies below 200 MeV. The thorium targets
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