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Now showing items 1 - 16 of 18

  • Ga-66: a standard for high-energy calibration of Ge detectors

    Baglin, CM   Browne, E   Norman, EB   Molnar, GL   Belgya, T   Revay, Z   Szelecsenyi, F  

    Two independent measurements of the relative emission probabilities for the strongest transitions in Ga-66 electron capture decay are reported here. The results of these measurements are in excellent agreement with each other and with those from another recent measurement. Consequently, Ga-66 emission probabilities for 18 strong lines, from 834 to 4806 keV, are now known to better than 1% accuracy. Thus, Ga-66 can now be considered a suitable radionuclide for Ge detector efficiency calibration up to an energy of 4806 keV, the highest energy attainable with radioactive calibration sources. We have also provided an empirical function for correcting earlier incorrect emission probability results for E-gamma greater than about 3 MeV which were produced using an inappropriate efficiency curve extrapolation. (C) 2002 Elsevier Science B.V. All rights reserved.
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  • Activation cross-sections of alpha induced nuclear reactions on iron up to 40 MeV

    Tarkanyi, F   Ditroi, F   Takacs, S   Szelecsenyi, F   Hermanne, A   Sonck, M  

    To obtain reliable activation cross-section data on iron for different applications, excitation function of alpha induced nuclear reactions were re-measured and critically compared with earlier reported experimental data. The agreement for all investigated reactions (Fe-nat(alpha,x)Mn-56, Co-55.56.57.58.61, Ni-56.57) is good. The status of the experimental database is satisfactory and allows preparation of recommended values for the most important reactions. (C) 2003 Elsevier Science B.V. All rights reserved.
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  • Excitation functions of deuteron induced nuclear reactions on natural tungsten up to 50 MeV

    Tarkanyi, F   Takacs, S   Szelecsenyi, F   Ditroi, F   Hermanne, A   Sonck, M  

    Excitation functions were measured for the production of Re-181,Re-182m,Re-182g,Re-183,Re-184g,Re-186 and W-187 radioisotopes via deuteron induced reactions on W for application purposes up to 50 MeV. The new data were compared with earlier reported experimental cross-section and integral yield data. Acceptable agreement was found between the new values and the literature data in the overlapping low energy regions. (C) 2003 Elsevier B.V. All rights reserved.
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  • Production possibility of Cu-61 using proton induced nuclear reactions on zinc for PET studies

    Szelecsenyi, F   Kovacs, Z   Suzuki, K   Okada, K   van der Walt, TN   Steyn, GF   Mukherjee, S  

    Excitation functions were measured by stacked-foil technique for the Zn-nat(p,x)Cu-61, Zn-66(p,x)Cu-61, Zn-68(p,x)Cu-61 and Zn-nat(p,x)Cu-60 nuclear processes up to 100 MeV. The experimental cross sections were compared with published data. On the base of these excitation functions, the cross sections of Zn-64(p,x)Cu-61 process were also deduced. Integral thick target yields were calculated for the Zn-64(p,x)Cu-61 and Zn-nat,Zn-64(p,x)Cu-60 processes and irradiation parameters were elaborated for the Cu-61 production via the Zn-64+p reactions for low and middle energy accelerators. According to our calculations the yield of Cu-61 amounts to 1.02(.)10(11) Bq(.)A(-1.)s(-1) (9.9 mCi(.)muA(-1.)h(-1)) from 19-->10 MeV while it reaches 3.91(.)10(11) Bq(.)A(-1.)s(-1) (38 mCi(.)muA(-1.)h(-1)) in the energy range of 67-->60 MeV.
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  • New cross-sections and intercomparison of deuteron monitor reactions on Al, Ti, Fe, Ni and Cu

    Takacs, S   Szelecsenyi, F   Tarkanyi, F   Sonck, M   Hermanne, A   Shubin, Y   Dityuk, A   Mustafa, MG   Zhuang, YX  

    The Al-27(d,x)Na-22,Na-24 reactions are frequently used to monitor deuteron beams above 20 MeV. To extend possible monitoring energy region toward lower energies, new monitor reactions are proposed and experimental cross-sections are measured for the processes Al-27(d,x)Na-22,Na-24, Ti-nat(d,x)V-48, Fe-nat(d,x)Co-56, Ni-nat(d,x)Cu-61 and Cu-nat(d,x)Zn-65. The excitation functions were studied using the activation method on stacks of thin metallic foil targets with natural isotopic composition. The data sets of the six processes were cross-checked with each other to provide reliable numerical cross-sections. Detailed literature compilation and critical comparison were made on the available data sets for the studied reactions. Predictions of model calculations were compared with the new experimental data. After establishing selection criteria, consistent data sets were chosen for each of the processes, which were then fitted with a spline or Pade method to provide recommended cross-sections. (C) 2001 Elsevier Science B.V. All rights reserved.
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  • COMMERCIAL AND PET RADIOISOTOPE MANUFACTURING WITH A MEDICAL CYCLOTRON

    BOOTHE, TE   MCLEOD, TF   PLITNIKAS, M   KINNEY, D   TAVANO, E   FEIJOO, Y   SMITH, P   SZELECSENYI, F  

    Mount Sinai has extensive experience in producing radionuclides for commercial sales and for incorporation into radiopharmaceuticals, including PET. Currently, an attempt is being made to supply radiochemicals to radiopharmaceutical manufacturers outside the hospital, to prepare radiopharmaceuticals for in-house use, and to prepare PET radiopharmaceuticals, such as 2-[F-18] FDG, for outside sales. This use for both commercial and PET manufacturing is atypical for a hospital-based cyclotron. To accomplish PET radiopharmaceutical sales, the hospital operates a nuclear pharmacy. A review of operational details for the past several years shows a continuing dependence on commercial sales which is reflected in research and developmental aspects and in staffing. Developmental efforts have centered primarily on radionuclide production, target development, and radiochemical processing optimization.
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  • Investigation of the Zn-nat(p,x)Zn-62 nuclear process up to (70) MeV: a new Zn-62/Cu-62 generator

    Szelecsenyi, F   Kovacs, Z   van der Walt, TN   Steyn, GF   Suzuki, K   Okada, K  

    The excitation function of the Zn-nat(p,x)Zn-62 nuclear process was measured by the stacked-foil technique up to a proton energy of 70 MeV to obtain accurate data for production of the 'mother nuclide' (Zn-62) of the PET related beta(+) emitting radioisotope Cu-62. Investigations were also made on the Zn-66(p,x)Zn-62 and Zn-nat(p,xn)Ga-66 processes and on the Zn-66(p,n)Ga-66 reaction using Zn-nat and highly enriched Zn-66. The excitation functions were compared with the published data. Thick target yields for the Zn-nat(p,x)Zn-62 and Cu-nat(p,xn)Zn-62 processes were also calculated up to 70 MeV. On the basis of these calculations the Zn-nat + p process results in higher yield for Zn-62 above 50 MeV than the (CU)-C-nat + p process. The latter process is presently used for practical production of Zn-62. In an energy window from 70 to 30 MeV the available EOB yield of the Zn-nat + p reactions is around 19 mCi/muA h (0.7 GBq/muAh) that makes the Zn-nat(p,x)Zn-62 process a good candidate for routine generator production. (C) 2003 Elsevier Science Ltd. All rights reserved.
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  • Measurement and evaluation of the excitation functions for alpha particle induced nuclear reactions on niobium

    Tarkanyi, F   Ditroi, F   Szelecsenyi, F   Sonck, M   Hermanne, A  

    Alpha particle induced nuclear reactions were investigated with the stacked foil activation technique on natural niobium targets up to 43 MeV. Excitation functions were measured for the production of Tc-96mg, Tc-95m, Tc-95g, Tc-94g, Nb-95mg and Nb-92m. Cumulative cross-sections, thick target yields and activation functions were deduced and compared with available literature data. Applications of the excitation functions in the field of thin layer activation techniques and beam monitoring are also discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
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  • Production possibility of Cu-60,Cu-61,Cu-62 radioisotopes by alpha induced reactions on cobalt for PET studies

    Szelecsenyi, F   Suzuki, K   Kovacs, Z   Takei, M   Okada, K  

    Excitation functions were measured by the stacked-foil technique for Co-59(alpha,n)Cu-62, Co-59(alpha,2n)Cu-64 and Co-59(alpha,3n)Cu-60 nuclear reactions up to 60 MeV. The excitation functions were compared with the published data. The optimum energy range for the production of Cu-61 and Cu-62 was found to be 39 --> 18 and 18.5 --> 6 MeV, respectively. The calculated thick target yield of Cu-61 in this energy range was 21.0 mCi/muA (supposing one half-life activation time)and 16.2 mCi/muA (supposing three half-life activation time) for Cu-62. The level of Cu-60 and Cu-62 impurities at Cu-64 production decreases to around 1% after a 1 h cooling time. The practical yield in this case is 17.2 mCi/muA. For production of Cu-62 the contamination level of Cu-64 increases continuously after EOB, but remains below 1% if the cooling time is less than 0.5 h (1.9 mCi/muA at 0.5 h after EOB). Unfortunately, in the case of Cu-60 production, the contamination level of Cu-64 and Cu-62 at EOB as found to be 18.4% and 47.9%, respectively. of the produced Cu-60 activity (6.4 mCi/muA, after 60 min irradiation time, in the energy interval 60 --> 44 MeV). (C) 2002 Elsevier Science B.V. All rights reserved.
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  • Evaluated cross section and thick target yield data bases of Zn+p processes for practical applications

    Szelecsenyi, F   Boothe, TE   Takacs, S   Tarkanyi, F   Tavano, E  

    On the basis of the present experimental work and available literature results, we have evaluated the cross section/integral thick target physical yield data for Zn-66(p, x)Zn-65, Zn-nat(p, x)Zn-65, Zn-66(p, n)Ga-66, Zn-67(p, 2n)Ga-66, Zn-68(p, 3n)Ga-66, Zn-nat(p, xn)Ga-66, Zn-67(p, n)Ga-67, Zn-68(p, 2n)Ga-67, Zn-nat(p, xn)Ga-67, Zn-68(p, n)Ga-68 and Zn-nat(p, xn)Ga-68 nuclear reactions up to 30 MeV. The data sets were evaluated via curve fitting to supply recommended values for practical applications such as routine radioisotope production, nuclear wear/corrosion measurements and nuclear analytical applications. (C) 1998 Elsevier Science Ltd. All rights reserved.
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  • Excitation function of Te-122(d,n)I-123 nuclear reaction: production of I-123 at a low energy cyclotron

    Takacs, S   Azzam, A   Sonck, M   Szelecsenyi, F   Kovacs, Z   Hermanne, A   Tarkanyi, F  

    The excitation function of the Te-122(d, n)I-123 nuclear reaction has been measured from threshold up to 21 MeV by the stacked foil irradiation technique. Good agreement was obtained with the results of the recent model calculations but an energy shift of 2 MeV to lower energy can be seen when comparing with cross section measured earlier. Integral yields have been deduced from the measured excitation function and have been compared with experimental thick target yields found in the literature. A comparison of the yields of the proton and deuteron induced reactions for production of I-123 is given. (C) 1999 Elsevier Science Ltd. All rights reserved.
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  • Formation of Cu-60 and Cu-61 via CO+(3)Hereactions up to 70 MeV: production possibility of (CU)-C-60 for PET studies

    Szelecsenyi, F   Kovacs, Z   Suzuki, K   Okada, K   Fukumura, T   Mukai, K  

    Excitation functions for Cu-60 and Cu-61 radioactive nuclei produced in He-3 bombardment of Co-59 up to 70 MeV has been measured using the stacked-foil activation technique. The experimental cross-sections of the Co-59(He-3,2n)Cu-60 and Co-59(He-3,n)(61) Cu nuclear reactions were compared with published literature data. Our yield calculations with respect to the application of the above reactions for practical production of Cu-60 showed that around 3.1 mCi/muA Cu-60 yield is available at EOB in the energy range 26 --> 10 MeV (supposing one half-life of Cu-60 activation time). Unfortunately, the level of Cu-61 impurity increases continuously after EOB (1.4% at EOB), but remains around 4% even at the end of a PET study (supposing one half-live cooling (processing) time and around 20 min counting time with PET). On the bases of the present work the Co + He-3 route seems to be a good candidate for routine production Of Cu-60 even with a low energy multiparticle cyclotron. (C) 2004 Elsevier B.V. All rights reserved.
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  • Practical production of Cu-61 using natural Co target and its simple purification with a chelating resin for Cu-61-ATSM

    Fukumura, T   Okada, K   Szelecsenyi, F   Kovacs, Z   Suzuki, K  

    Copper-61 (T-1/2 = 3.41 h) produced via the Co-59(alpha, 2n)Cu-61 nuclear reaction using natural Co target was isolated from the irradiated target by two methods developed here and applied for preparation of (Cu-61-ATSM) (Cu-61-diacetyl-bis(N-4-methylthiosemicarbazone)), known as an imaging agent of hypoxic tissue. A commercially available cobalt disk (thickness: 125 mum) was irradiated with 40 MeV (37.9 MeV on target) a particles, then treated with conc. HNO3, and the Cu-61 was separated by two different methods, i.e. a two column method using a cation and an anion exchange column; and a one Column method using a column packed with chelating resin, Chelex 100. Both separation methods gave satisfactory results, though the latter method was superior because of the simplicity of the apparatus, the separation procedure and somewhat shorter processing time. Around 1.1 GBq of 61Cu(2+) were obtained with >95% yield (decay corrected) from Co target at 10 I-LA for 1 h irradiation, and with the radionuclidic purity of >98% (EOS). The only radionuclidic impurity in the isolated Cu-61(2+) solution was identified to be Cu-60 at EOS but no radionuclidic impurity was observed after 50 hours. The solution of Cu-61-ATSM was prepared in >85% radiochemical yield with >95% radiochemical purity.
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  • Excitation functions of nuclear reactions induced by alpha particles up to 42 MeV on Ti-nat for monitoring purposes and TLA

    Hermanne, A   Sonck, M   Takacs, S   Szelecsenyi, F   Tarkanyi, F  

    Excitation functions for the reactions induced by alpha particles on Ti-nat foils and leading to the formation of Sc-44m,Sc-44g,Sc-46,Sc-47,Sc-48; Cr-48,Cr-51 and V-48 were determined using the stacked foil technique for energies from the respective reaction thresholds up to 42 MeV. The new experimental values are compared to earlier literature values and generally good accordance is found. It appears that the Ti-nat(alpha,x)Cr-51 reaction is particularly useful for monitoring alpha-beams in the 10-20 MeV region while for energies above 20 MeV the Ti-nat(alpha,x)Sc-47 reaction or the Ti-nat(alpha,x)V-48 reaction are more suited. The excitation functions established can be used to determine calibration curves for thin layer activation (TLA) as well. (C) 1999 Elsevier Science B.V. All rights reserved.
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  • New experimental data, compilation and evaluation for the Cu-nat(alpha, x)Ga-66, Cu-nat(alpha, x)Ga-67 and Cu-nat(alpha, x)Zn-65 monitor reactions

    Tarkanyi, F   Szelecsenyi, F   Takacs, S   Hermanne, A   Sonck, M   Thielemans, A   Mustafa, MG   Yu, SB   Zhuang, YX  

    In the context of a systematic investigation of monitor reactions for charged particle beams, a detailed compilation and critical comparison of the earlier published data for the Cu-nat(alpha, x)Ga-66, Cu-nat(alpha, x)Ga-67 and Cu-nat(alpha, x)Zn-65 reactions have been performed. To solve the surprisingly large discrepancies found in the literature we also performed a new series of cross-section measurements up to 40 MeV for the above mentioned reactions. We discuss the reasons for the discrepancies and provide reliable numerical Values for a recommended database. The new experimental values and selected literature data were compared with the predictions of different model calculations. The selected experimental data sets were fitted using different methods to obtain recommended values. (C) 2000 Elsevier Science B.V. All rights reserved.
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  • New cross-section data for the Zn-66(p,n) Ga-66, Zn-68(p,3n)Ga-66, Zn-nat(p,X)Ga-66, Zn-68(p,2n)Ga-67 and at Zn-nat(p,x)(67) Ga nuclear reactions up to 100 MeV

    Szelecsenyi, F   Steyn, GF   Kovacs, Z   van der Walt, TN   Suzuki, K   Okada, K   Mukai, K  

    Excitation functions were measured for the Zn-66(p,n)Ga-66, Zn-68(p,3n)Ga-66, Zn-nat(p,x)Ga-66, Zn-68(p,2n)Ga-67 and Zn-nat(p,x)Ga-67 nuclear processes up to 100 MeV. These results were compared to the available cross-section values from previous studies. A detailed compilation of the earlier works was also performed. (c) 2005 Elsevier B.V. All rights reserved.
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