http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
Half-Lives of the Isomeric States ^(102m,g)Rh
Ye. Skakun,S. N. Utenkov,A. N. Dovbnya,S. M. Qaim,H. H. Coenen 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The half-lives of the isomeric states ^(102m,g)Rh were determined by measuring their gamma-ray spectra using a Ge(Li)-detector over about 5 years. Two radioactive sources were used for this aim. One of them was produced by the ^(102m,g)Ru(^3He,x)^(102m,g)Rh reaction induced by ^3He ions of 31 MeV bombarding energy from the Julich cyclotron CV28. Another source was made by the photonuclear reaction ^(103)Rh(γ,n)^(102m,g)Rh using 22 MeV bremsstrahlung from the Kharkiv electron linear accelerator. The former reaction preferably populates the high-spin isomeric state and the latter the ground one. The half-lives were determined from the decay curves monitoring the intensities of the 475, (628 + 631), (692 + 695 + 697), 766, and 1046 keV γ-transitions following the ^(102m,g)Rh decay. Average weighted values of the half-lives amount to T^(1/2) = (3.47 ± 0.04) y and T^(1/2) = (207.2 ± 1.7) d for ^(102m)Rh and ^(102g)Rh, respectively.
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.