http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
G. F. Steyn,C. Vermeulen,F. Szelecsenyi,Z. Kovacs,K. Suzuki,T. Fukumura,K. Nagatsu 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Excitation functions have been measured for ^(86,87,88,89)Zr produced in the proton bombardment of ^(89)Y and ^(93)Nb as well as for ^(90,91m,92m)Nb formed in the case of ^(93)Nb+p. Thick-target yields were calculated and measured with the aim to investigate the feasibility of tandem niobium/yttrium targetry for the production of the medically important isotopes ^(88)Zr and ^(89)Zr in the proton energy region up to 70 MeV. The expected yields of the Zr isotopes formed as by-products in the Nb encapsulation of certain high-performance targetry have also been determined. Amongst the radio-niobiums, some of which are relevant in thin-layer activation (TLA) wear measurements of components made of alloys containing niobium, an unresolved discrepancy of about a factor of 2 is evident in the case of ^(92m)Nb.
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.