10 results on '"Kevin R. Jackman"'
Search Results
2. Synthetic spectra for radioactive strontium production QA/QC
- Author
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Eva R. Birnbaum, Kevin R. Jackman, Francois M. Nortier, D. E. Norman, Jonathan W. Engle, and Kevin D. John
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Strontium ,Chemistry ,business.industry ,Health, Toxicology and Mutagenesis ,Nuclear engineering ,Public Health, Environmental and Occupational Health ,Analytical chemistry ,Peak fitting ,chemistry.chemical_element ,Pollution ,Spectral line ,Analytical Chemistry ,Nuclear Energy and Engineering ,QA/QC ,Radiology, Nuclear Medicine and imaging ,Spectral analysis ,Spectroscopy ,business ,Quality assurance ,Doppler broadening - Abstract
Radioactive 82Sr/82Rb produced at Los Alamos National Laboratory is routinely used in generators for hospitals and medical laboratories to support cardiac imaging. The proper quantification of strontium radioisotopes in a sample is important to ensure quality and regulatory compliance. However, the quantification of the impurity 85Sr is difficult, because its primary gamma-ray at 514 keV interferes with the annihilation peak at 511 keV from 82Rb. Synthetic spectra were created as a quality test of several gamma-ray spectral analysis tools’ ability to resolve peaks in the 511/514 keV multiplet. The peak fitting results from the spectroscopy tools (RAYGUN, SPECANAL, GammaVision, UNISAMPO, and GAMANAL) are presented. These spectra can also be useful for other programs to test their annihilation peak analysis procedures.
- Published
- 2014
3. Ac, La, and Ce radioimpurities in 225Ac produced in 40–200 MeV proton irradiations of thorium
- Author
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George S. Goff, Francois M. Nortier, Kevin R. Jackman, Jonathan W. Engle, M. S. Gulley, Leo J. Bitteker, Lisa Ann Hudston, Stepan G. Mashnik, Laura E. Wolfsberg, Michael E. Fassbender, Kevin D. John, J. L. Ullmann, Donald E. Dry, John W. Weidner, B. Ballard, C. Pillai, and Eva R. Birnbaum
- Subjects
Radionuclide ,chemistry ,Proton ,Radiochemistry ,Thorium ,chemistry.chemical_element ,Physical and Theoretical Chemistry - Abstract
Accelerator production of 225Ac addresses the global supply deficiency currently inhibiting clinical trials from establishing 225Ac's therapeutic utility, provided that the accelerator product is of sufficient radionuclidic purity for patient use. Two proton activation experiments utilizing the stacked foil technique between 40 and 200 MeV were employed to study the likely co-formation of radionuclides expected to be especially challenging to separate from 225Ac. Foils were assayed by nondestructive γ-spectroscopy and by α-spectroscopy of chemically processed target material. Nuclear formation cross sections for the radionuclides 226Ac and 227Ac as well as lower lanthanide radioisotopes 139Ce, 141Ce, 143Ce, and 140La whose elemental ionic radii closely match that of actinium were measured and are reported. The predictions of the latest MCNP6 event generators are compared with measured data, as they permit estimation of the formation rates of other radionuclides whose decay emissions are not clearly discerned in the complex spectra collected from 232Th(p,x) fission product mixtures.
- Published
- 2014
4. Proton-induced cross sections relevant to production of 225Ac and 223Ra in natural thorium targets below 200MeV
- Author
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Michael E. Fassbender, Aaron Couture, M. S. Gulley, Leo J. Bitteker, Francois M. Nortier, J. L. Ullmann, John W. Weidner, François M. Hemez, Stepan G. Mashnik, Kevin R. Jackman, Eva R. Birnbaum, Kevin D. John, Laura E. Wolfsberg, Donald E. Dry, B. Ballard, and H. Bach
- Subjects
Actinium ,Excitation function ,Range (particle radiation) ,Radiation ,Materials science ,Proton ,Thorium ,Nuclear Theory ,chemistry.chemical_element ,Spectrometry, Gamma ,Nuclear physics ,Cross section (geometry) ,chemistry ,Yield (chemistry) ,Physics::Accelerator Physics ,Protons ,Nuclear Experiment ,Radium - Abstract
Cross sections for (223,)(225)Ra, (225)Ac and (227)Th production by the proton bombardment of natural thorium targets were measured at proton energies below 200 MeV. Our measurements are in good agreement with previously published data and offer a complete excitation function for (223,)(225)Ra in the energy range above 90 MeV. Comparison of theoretical predictions with the experimental data shows reasonable-to-good agreement. Results indicate that accelerator-based production of (225)Ac and (223)Ra below 200 MeV is a viable production method.
- Published
- 2012
5. Cross sections from 800 MeV proton irradiation of terbium
- Author
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Kevin R. Jackman, Stepan G. Mashnik, R. Gritzo, B. Ballard, Leo J. Bitteker, Eva R. Birnbaum, Francois M. Nortier, Aaron Couture, H. Bach, M. S. Gulley, C. Pillai, Michael E. Fassbender, Jonathan W. Engle, Kevin D. John, J. L. Ullmann, and D. M. Smith
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Nuclear Theory ,Isotope ,Proton ,Fission ,FOS: Physical sciences ,chemistry.chemical_element ,Nuclear data ,Terbium ,Nuclear Theory (nucl-th) ,Nuclear physics ,chemistry ,Spallation ,Gamma spectroscopy ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment - Abstract
A single terbium foil was irradiated with 800 MeV protons to ascertain the potential for production of lanthanide isotopes of interest in medical, astrophysical, and basic science research and to contribute to nuclear data repositories. Isotopes produced in the foil were quantified by gamma spectroscopy. Cross sections for 36 isotopes produced in the irradiation are reported and compared with predictions by the MCNP6 transport code using the CEM03.03, Bertini, and INCL+ABLA event generators. Our results indicate the need to accurately consider fission and fragmentation of relatively light target nuclei like terbium in the modeling of nuclear reactions at 800 MeV. The predictive power of the code was found to be different for each event generator tested but was satisfactory for most of the product yields in the mass region where spallation reactions dominate. However, none of the event generators' results are in complete agreement with measured data., Comment: 16 pages, 3 figures, 1 tables, only pdf, submitted to Nuclear Physics A
- Published
- 2012
6. 99Mo Separation from High-Concentration Irradiated Uranium Nitrate and Uranium Sulfate Solutions
- Author
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Gregory E. Dale, Michael J. Gallegos, Sean D. Reilly, Kevin R. Jackman, Charles T. Kelsey, Gary M. Stange, Iain May, and Dale Allen Dalmas
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Isotope ,General Chemical Engineering ,Radiochemistry ,chemistry.chemical_element ,General Chemistry ,Natural uranium ,Uranium ,Enriched uranium ,Industrial and Manufacturing Engineering ,Uranium sulfate ,chemistry.chemical_compound ,chemistry ,Uranyl nitrate ,Uranyl sulfate ,Sulfate ,Nuclear chemistry - Abstract
We report separation data indicating that 99Mo can be separated from a vast excess of either uranyl sulfate or uranyl nitrate in irradiated dilute acid solutions. These results suggest that, if medical isotope 99Mo is produced during fission of high concentrations of low enriched uranium sulfate solution fuel, it is feasible to both recover >90% of the 99Mo for further purification and the uranium for recycle.
- Published
- 2012
7. Nuclear excitation functions from 40-200 MeV proton irradiation of terbium
- Author
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M. S. Gulley, Kevin R. Jackman, Lauren A. Parker, C. Pillai, Francois M. Nortier, J. L. Ullmann, Eva R. Birnbaum, Jonathan W. Engle, Kevin D. John, Stepan G. Mashnik, and Leo J. Bitteker
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Nuclear and High Energy Physics ,Proton ,Isotope ,010308 nuclear & particles physics ,Radiochemistry ,chemistry.chemical_element ,FOS: Physical sciences ,Terbium ,010403 inorganic & nuclear chemistry ,01 natural sciences ,0104 chemical sciences ,Stellar nucleosynthesis ,chemistry ,Nucleosynthesis ,0103 physical sciences ,Irradiation ,Nuclear Experiment (nucl-ex) ,Nucleon ,Nuclear Experiment ,Instrumentation ,Excitation - Abstract
Nuclear formation cross sections are reported for 26 radionuclides, measured with 40 to 200 MeV proton irradiations of terbium foils. These data are relevant to the production of medically relevant radionuclides (e.g., 152Tb, 155Tb, 155Eu, and 156Eu) and to ongoing efforts to characterize stellar nucleosynthesis routes passing through long-lived intermediaries (e.g., 153Gd). Computational predictions from the ALICE2011, CEM03.03, Bertini, and INCL+ABLA codes are compared with newly measured data to contribute to the ongoing process of code development, and yields are calculated for selected radionuclides using measured data., Comment: 34 pages, 30 figures, 5 tables, submitted to Phys. Rev. C
- Published
- 2015
- Full Text
- View/download PDF
8. Multispectral Gamma-Ray Analysis Using Clover Detectors with Application to Uranium Fission Product Analysis
- Author
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Steven M. Horne and Kevin R. Jackman
- Subjects
Nuclear physics ,Physics ,Nuclear fission product ,Fission products ,chemistry ,Nuclear forensics ,Detector ,Gamma ray ,chemistry.chemical_element ,Germanium ,Uranium ,Semiconductor detector - Published
- 2013
9. Cross sections from proton irradiation of thorium at 800 MeV
- Author
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Jonathan W. Engle, Eva R. Birnbaum, John W. Weidner, Leo J. Bitteker, M. S. Gulley, Francois M. Nortier, Aaron Couture, C. Pillai, J. L. Ullmann, Laura E. Wolfsberg, Kevin R. Jackman, Stepan G. Mashnik, Kevin D. John, and Michael E. Fassbender
- Subjects
Physics ,Nuclear and High Energy Physics ,Radionuclide ,Range (particle radiation) ,Code development ,Nuclear Theory ,Proton ,Thorium ,chemistry.chemical_element ,FOS: Physical sciences ,Nuclear physics ,Nuclear Theory (nucl-th) ,chemistry ,Spallation ,Nuclide ,Irradiation ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment - Abstract
Nuclear formation cross sections are reported for 65 nuclides produced from 800-MeV proton irradiation of thorium foils. These data are useful as benchmarks for computational predictions in the ongoing process of theoretical code development and also to the design of spallation-based radioisotope production currently being considered for multiple radiotherapeutic pharmaceutical agents. Measured data are compared with the predictions of three MCNP6 event generators and used to evaluate the potential for 800-MeV productions of radioisotopes of interest for medical radiotherapy. In only a few instances code predictions are discrepant from measured values by more than a factor of two, demonstrating satisfactory predictive power across a large mass range. Similarly, agreement between measurements presented here and those previously reported is good, lending credibility to predictions of target yields and radioimpurities for high-energy accelerator-produced radionuclides., Comment: 16 pages, 3 figures, 2 tables, only pdf, minor revision: version accepted for publication by Phys. Rev. C. arXiv admin note: text overlap with arXiv:1207.1486
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- 2013
- Full Text
- View/download PDF
10. Radiochemistry Results from IER-163 Comet Irradiation
- Author
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Todd Bredeweg, Warren J. Oldham, Moses Attrep, Robert S. Rundberg, John Alan Bounds, Joetta Goda, David Hayes, Kevin R. Jackman, Ann Rene Schake, Jeffrey A. Favorite, Rene Sanchez, and William L. Myers
- Subjects
Nuclear fission product ,Criticality ,Chemistry ,Comet ,Radiochemistry ,Neutron ,Irradiation ,Radiochemical analysis ,National laboratory - Abstract
The COMET assembly at the National Criticality Experiments Research Center (NCERC) at the Nevada National Security Site (NNSS) was used to irradiate twelve foils in September 2011. The intention of this irradiation was to measure 'peak yield' fission product activities, activation products, and so-called 'endpoint R values' for different foil materials in a non-thermal neutron spectrum. After irradiation, several of the foils were shipped to Los Alamos National Laboratory (LANL) for radiochemical analysis. The results from the non-destructive and radiochemical analyses of six of these foils are presented.
- Published
- 2012
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