@article{davis_dudziak_yim_mcnelis_wooten_2011, title={PHOTON BUILDUP FACTORS IN LAMINATED DUAL-LAYER SHIELDS}, volume={173}, ISSN={["1943-7471"]}, DOI={10.13182/nt11-110}, abstractNote={Abstract In radiation protection, photon buildup factors provide a convenient method for calculating dose and exposure response after various shielding configurations, as well as information about the behavior of radiation in these configurations. Though many situations call for multilayer shields, few databases and derived analytical formulas for photon buildup in multilayer shields exist. This research develops buildup factors and analytical fits to these data for slab-geometric, dual-layer shields composed of various materials. The photon buildup factors were calculated for monoenergetic photon sources incident on two-layer shields of various combinations of lead, polyethylene, aluminum, and stainless steel for thicknesses varying between 2 and 20 mean free paths using the Parallel Time Independent Sn (PARTISN) discrete ordinates code. The Gauss-Lobatto S100 quadrature was used with a 244-energy-group structure and coupled photon and electron cross sections. Data from PARTISN calculations were then benchmarked for representative cases using MCNP5, and fits to a new analytical formula were developed using Mathematica 6.0.}, number={3}, journal={NUCLEAR TECHNOLOGY}, author={Davis, Adam and Dudziak, Donald J. and Yim, Man-Sung and McNelis, David and Wooten, H. Omar}, year={2011}, month={Mar}, pages={270–288} }
 @article{schirmers_davis_wooten_dudziak_yim_mcnelis_2009, title={CALCULATION OF PHOTON EXPOSURE AND AMBIENT DOSE SLANT-PATH BUILDUP FACTORS FOR RADIOLOGICAL ASSESSMENT}, volume={167}, ISSN={["0029-5450"]}, DOI={10.13182/NT09-1}, abstractNote={Abstract Slant-path photon buildup factors for nine radiation shielding materials (air, aluminum, concrete, iron, lead, leaded glass, polyethylene, stainless steel, and water) are calculated with the most recent cross-section data available using Monte Carlo and discrete ordinates methods. Discrete ordinates calculations use a 244-group energy structure based on previous research at Los Alamos National Laboratory (LANL) and focus on the effects of group widths in multigroup calculations for low-energy photons. Buildup-factor calculations in discrete ordinates benefit from coupled photon/electron cross sections to account for secondary photon effects. Also, ambient dose equivalent buildup factors were analyzed at lower energies where corresponding response functions do not exist in the literature. The results of these studies are directly applicable to radiation safety at LANL, where the dose-modeling code PANDEMONIUM is used to estimate worker dose in plutonium-handling facilities. Buildup factors determined in this work will be used to enhance the code’s modeling capabilities but also should be of general interest to the radiation shielding community.}, number={3}, journal={NUCLEAR TECHNOLOGY}, author={Schirmers, Fritz G. and Davis, Adam and Wooten, H. Omar and Dudziak, Donald J. and Yim, Man-Sung and McNelis, David}, year={2009}, month={Sep}, pages={395–409} }
 @article{wooten_dudziak_hertel_kornreich_davis_2008, title={Purely angular effects of photon buildup factors for thin shields of lead, iron, aluminum, and water}, volume={159}, ISSN={["1943-748X"]}, DOI={10.13182/NSE06-42}, abstractNote={Abstract This study investigates purely angular effects on photon buildup factors for slabs with optical thickness up to 10 mean free paths. Photon buildup factors are determined for different slabs, upon which monoenergetic photons between 50 keV and 10 MeV are incident at angles between 0 and 1.48 radians. As the incident angle is increased, the physical slab thickness is reduced to maintain a constant slant-path optical thickness relative to incident photons. This method identifies previously unexplored angular relationships between slab thickness and incident angle. Coupled electron/photon cross sections are used to account for secondary photon effects of bremsstrahlung and electron binding energies. The discrete ordinates code PARTISN is used to determine angular photon buildup factors for ten incident energies and ten incident angles for lead, iron, aluminum, and water slabs. Portions of these results are applicable to other slab geometry buildup studies.}, number={3}, journal={NUCLEAR SCIENCE AND ENGINEERING}, author={Wooten, H. Omar and Dudziak, Donald J. and Hertel, Nolan E. and Kornreich, Drew E. and Davis, Adam C.}, year={2008}, month={Jul}, pages={296–310} }
 @inproceedings{zheng_wechsler_dudziak_hunn_mansur_2001, title={Near-surface radiation damage due to recoils from adjacent proton-irradiated materials at applied to SNS and APT}, booktitle={Proceedings, Fourth Topical Meeting on Nuclear Applications of Accelerator Technology, ANS, La Grange Park, Illinois}, author={Zheng, Y. and Wechsler, M. S. and Dudziak, D. J. and Hunn, J. D. and Mansur, L. K.}, year={2001}, pages={381–387} }
 @article{barnett_wechsler_dudziak_mansur_murphy_2001, title={Radiation damage to the 316 stainless steel target container vessel at SNS}, volume={296}, ISSN={["1873-4820"]}, DOI={10.1016/S0022-3115(01)00499-8}, abstractNote={In the past, our calculations of radiation damage (concentrations of displacements, helium atoms, and hydrogen atoms) to the 316 stainless steel (316SS) container vessel at the spallation neutron source (SNS) mercury target dealt with the average damage rates in a volume at the nose of the vessel. This paper describes an attempt to improve the accuracy of estimates of the damage rates at the center of the proton beam where the damage rates are expected to be the highest. Four series of calculations (Series I–IV) were conducted to determine the damage rates within volumes (tally volumes) that varied systematically in location in the vessel. This permitted extrapolation to the rates at the tip of the vessel nose (Z=0) and at the center of the proton beam (X=Y=0). The total damage rates due to protons and neutrons were found to be: 36 dpa/yr, 1400 appmHe/yr, and 20 000 appmH/yr. In addition, insight was gained into how the damage rates vary with position in the vessel nose and at locations further downstream in the vessel.}, journal={JOURNAL OF NUCLEAR MATERIALS}, author={Barnett, MH and Wechsler, MS and Dudziak, DJ and Mansur, LK and Murphy, BD}, year={2001}, month={Jul}, pages={54–60} }
 @article{zheng_wechsler_dudziak_hunn_mansur_2001, title={Simulation of the implantation of recoils and displacement production in the 316 stainless steel mercury-container vessel at SNS}, volume={296}, ISSN={["1873-4820"]}, DOI={10.1016/S0022-3115(01)00500-1}, abstractNote={In this study, the focus is on the possible effect of mercury and transmuted atom recoils that are implanted into the wall of the stainless steel container vessel at SNS. Two computer codes were used: Los Alamos high energy transport (LAHET) and the stopping and range of ions in matter (SRIM). LAHET provided information of the energy distribution of the recoils upon bombardment. Also, SRIM simulated the transport of recoils through the mercury layer adjacent to the stainless steel wall and into the wall itself, and provided recoil and displacement concentration profiles in the wall. The calculated recoil and displacement concentrations in the near-surface region of the wall appear to be quite significant. The recoil and displacement concentrations per year at the surface are determined to be about 0.0015 recoil atoms/wall atom and about 17 dpa at the center of an incident proton beam. These concentrations fall to about one-half of the surface values at a penetration distance of about 0.1 μm, and the concentrations become negligibly small at 0.5 μm and beyond.}, journal={JOURNAL OF NUCLEAR MATERIALS}, author={Zheng, Y and Wechsler, MS and Dudziak, DJ and Hunn, JD and Mansur, LK}, year={2001}, month={Jul}, pages={61–65} }
 @inproceedings{barnett_wechsler_dudziak_corzine_charlton_mansur_1999, title={Calculations of radiation damage at SNS}, booktitle={Proceedings of the Second Topical Meeting on Nuclear Applications of Accelerator Technology, Le Grange Park, Illinois}, author={Barnett, M. H. and Wechsler, M. S. and Dudziak, D. J. and Corzine, R. K. and Charlton, L. A. and Mansur, L. K.}, year={1999}, pages={555–559} }
 @article{zheng_wechsler_barnett_dudziak_mansur_1999, title={PKA spectrum and radiation damage for 150 Mev electrons on 316 stainless steel}, volume={80}, number={1999}, journal={Transactions of the American Nuclear Society}, author={Zheng, Y. and Wechsler, M. S. and Barnett, M. H. and Dudziak, D. J. and Mansur, L. K.}, year={1999}, pages={95–96} }
 @article{barnett_wechsler_dudziak_charlton_mansur_1999, title={Radiation damage at SNS}, volume={80}, number={1999}, journal={Transactions of the American Nuclear Society}, author={Barnett, M. H. and Wechsler, M. S. and Dudziak, D. J. and Charlton, L. A. and Mansur, L. K.}, year={1999}, pages={96–97} }
 @article{corzine_wechsler_dudziak_ferguson_james_1999, title={Radiation damage calculations for the APT materials test program}, volume={80}, number={1999}, journal={Transactions of the American Nuclear Society}, author={Corzine, R. K. and Wechsler, M. S. and Dudziak, D. J. and Ferguson, P. D. and James, M. R.}, year={1999}, pages={97–98} }
 @article{wechsler_dudziak_1999, title={Radiation damage to materials at spallation neutron sources}, volume={44}, number={6}, journal={Bulletin of the American Physical Society}, author={Wechsler, M. S. and Dudziak, D. J.}, year={1999}, pages={52} }
 @inproceedings{corzine_barnett_zheng_dudziak_wechsler_1999, title={Radiation effects calculations for spallation neutron sources}, number={1999}, booktitle={Proceedings, Third International Conference on Accelerator-Driven Technologies and Applications, Prague, Czech Republic, June 7 - 11, 1999}, author={Corzine, R. K. and Barnett, M. H. and Zheng, Y. and Dudziak, D. J. and Wechsler, M. S.}, year={1999} }
 @inproceedings{charlton_mansur_wechsler_barnett_dudziak_1999, title={SNS radiation damage parameters}, number={1999}, booktitle={Proceedings, Third International Workshop on Spallation Materials Technology, Santa Fe, NM, April 29 - May 4, 1999}, author={Charlton, L. A. and Mansur, L. K. and Wechsler, M. S. and Barnett, M. H. and Dudziak, D. J.}, year={1999} }
 @inproceedings{charlton_mansur_barnett_corzine_dudziak_wechsler_1998, title={Calculations of helium production in materials at spallation neutron sources}, booktitle={Proceedings of the Second Topical Meeting on Nuclear Applications of Accelerator Technology, Le Grange Park, Illinois}, author={Charlton, L. A. and Mansur, L. K. and Barnett, M. H. and Corzine, R. K. and Dudziak, D. J. and Wechsler, M. S.}, year={1998}, pages={247–253} }
 @article{corzine_dudziak_wechsler_barnett_mansur_1998, title={Calculations of helium production in materials irradiated at spallation neutron sources}, volume={78}, number={1998}, journal={Transactions of the American Nuclear Society}, author={Corzine, R. K. and Dudziak, D. J. and Wechsler, M. S. and Barnett, M. H. and Mansur, M. H.}, year={1998}, pages={289–290} }
 @article{ferguson_sommer_dudziak_wechsler_barnett_corzine_1998, title={Radiation damage calculations for the LANSCE degrader}, volume={78}, number={1998}, journal={Transactions of the American Nuclear Society}, author={Ferguson, P. D. and Sommer, W. F. and Dudziak, D. J. and Wechsler, M. S. and Barnett, M. H. and Corzine, R. K.}, year={1998}, pages={291–293} }
 @inbook{wechsler_barnett_dudziak_mansur_charlton_barnes_johnson_1997, title={Calculations of radiation effects in 316 stainless steel container materials for the NSNS}, booktitle={Materials for Spallation Neutron Sources, Proceedings of the Symposium on Materials for Spallation Neutron Sources, Orlando, Florida, February 9 - 13, 1997}, publisher={Warrendale, Pa.: Minerals, Metals & Materials Society}, author={Wechsler, M. S. and Barnett, M. H. and Dudziak, D. J. and Mansur, L. K. and Charlton, L. A. and Barnes, J. M. and Johnson, J. O.}, year={1997}, pages={23–28} }
 @inbook{wechsler_barnett_dudziak_corzine_sommer_pitcher_ferguson_mansur_farrell_charlton_et al._1997, title={Radiation effects on stainless steel materials in accelerator-based spallation neutron sources}, booktitle={Proceedings of the Topical Meeting on Nuclear Applications of Accelerator Technology, Albuquerque, New Mexico, November 16-20, 1997}, publisher={La Grange Park, Ill.: American Nuclear Society}, author={Wechsler, M. S. and Barnett, M. H. and Dudziak, D. J. and Corzine, R. K. and Sommer, W. F. and Pitcher, E. J. and Ferguson, P. D. and Mansur, L. K. and Farrell, K. and Charlton, L. A. and et al.}, year={1997}, pages={21–28} }
 @book{a handbook on the community college in america its history, mission, and management_1994, publisher={Westport, Conn: Greenwood Press}, year={1994} }