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I. Spahn,M. M. Shehata,S. Spellerberg,B. Scholten,H. H. Coenen,S. M. Qaim,G. F. Steyn,C. Vermeulen,Z. Kovacs,F. Szelecsenyi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The lighter, positron emitting isotopes ^(75)Br and ^(76)Br have already been in use for some time in molecular imaging with PET. The two Auger electron emitters ^(77)Br and ^(80m)Br are of potential interest for internal radiotherapy. In this work new cross section measurements were done on nine (p,xn) reactions on enriched Se targets up to 80 MeV. Thin samples were irradiated in a stacked-foil arrangement. The produced radioactivity was measured non-destructively using HPGe detector γ-ray spectrometry. Concerning ^(80m)Br, a special low-energy HPGe detector was used. From the cross section data on the formation of ^(75)Br, ^(76)Br, ^(77)Br and ^(80m)Br their possible production yields have been deduced and the issue of radionuclidic purity is discussed. Whereas an efficient production of ^(75)Br is only achievable via intermediate energy reactions above 30 MeV, ^(76)Br and ^(77)Br can be produced both with proton energies below 25 MeV as well as with intermediate energy protons up to 70 MeV. The production of ^(80m)Br appears to be a good application of small accelerators.
M. Al-Abyad,I. Spahn,B. Scholten,S. Spellerberg,S. M. Qaim,H. H. Coenen 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Excitation functions of the reactions ^(55)Mn(p,n)^(55)Fe, ^(55)Mn(p,x)^(54)Mn and ^(55)Mn(p,x)^(51)Cr were measured from their respective thresholds up to 18 MeV in the first case and up to 45 MeV in the latter two cases, using the conventional stacked-foil technique. The radioactivity of ^(55)Fe was determined via high resolution X-ray spectrometry, both non-destructively and after radiochemical separation, and of the other radionuclides via high resolution γ-ray spectrometry. Nuclear model calculations were performed using the codes ALICE-IPPE, EMPIRE and TALYS. In some cases good agreement was found between the experimental and theoretical data while in others considerable deviations were observed. From the experimental data the integral yields of the three investigated radionuclides were calculated.