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Topic Area: Radiation Physics

Displaying records 21 to 30 of 60 records.
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21. Correction Factors for the NIST Free-Air Ionization Chambers Used to Realize Air Kerma from W-Anode X-ray Beam
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7887
Topic: Radiation Physics
Published: 10/16/2012
Author: Stephen Michael Seltzer
Abstract: This report details analyses in the development of certain correction factors for free-air ionization chambers used by the National Institute of Standards and Technology to realize air kerma for its measurement standards and calibrations of W-anode x ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911686

22. Testing Three-body Quantum Electrodynamics with Trapped Ti-20 Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation
Topic: Radiation Physics
Published: 10/10/2012
Authors: Lawrence T Hudson, C T Chantler, Mark N. Kinnane, John D Gillaspy, A.T. Payne, L F Smale, Albert Henins, Joseph N Tan, J A Kimpton, E Takacs, K Makonyi, Joshua M Pomeroy
Abstract: We report the measurement of the w (1s2p 1P1 ! 1s2 1S0) resonance line transition energy in helium-like titanium. Our result, 4749.85(7) eV, deviates from the most recent ab initio prediction by three times our experimental uncertainty and by many ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911171

23. Search for a T-odd, P-even Triple Correlation in Neutron Decay
Topic: Radiation Physics
Published: 9/14/2012
Authors: Jeffrey S Nico, T E. Chupp, K P Coulter, R L Cooper, S. J. Freeman, B. K. Fujikawa, A. Garcia, G L. Jones, Hans P Mumm, Alan K Thompson, C A Trull, F. E Wiefeldt, J. F. Wilkerson
Abstract: Time-reversal-invariance (T) violation, or equivalently, assuming charge-conjugation-parity-time-reversal (CPT) invariance, CP violation may explain the observed cosmological baryon asymmetry as well as signal physics beyond the Standard Model. In th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911424

24. Justification of Shielding Requirements for Plutonium Sources
Series: Technical Note (NIST TN)
Report Number: 1758
Topic: Radiation Physics
Published: 9/12/2012
Authors: Leticia S Pibida, Michael P Unterweger
Abstract: This report provides a justification for shielding plutonium sources when testing radiation detection instruments against standard performance requirements and test methods. The use of copper as a shielding material is proposed to provide compara ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912144

25. Comment on ,Estimation of organ and effective dose due to Compton backscatter security scansŠ [Med. Phys. 39, 3396 (2012)]
Topic: Radiation Physics
Published: 9/1/2012
Authors: Lawrence T Hudson, Jack Leigh Glover
Abstract: In the June Issue of Medical Physics, Hoppe and Schmidt presented estimates of the organ and effective dose from an x-ray backscatter scan using a Rapiscan Secure 1000 single pose system . The paper presents Monte Carlo modeling results and takes its ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911687

26. In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source
Topic: Radiation Physics
Published: 7/2/2012
Authors: Thomas R Gentile, X Tong, C Y Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J Goyette, W-T Lee, A. Parizzi
Abstract: We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). Using the spin exchange optical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911438

27. Measurements and Standards for Bulk-Explosive Detection
Topic: Radiation Physics
Published: 5/31/2012
Authors: Lawrence T Hudson, Fred B Bateman, Paul Mark Bergstrom, Frank Cerra, Jack Leigh Glover, Ronaldo Minniti, Stephen Michael Seltzer, Ronald E Tosh
Abstract: Due to the ease of assembly and leveraged disruptive effect, the improvised explosive device (IED) is the method of choice of today‰s terrorist. With more than ten thousand IED incidents annually, and global expenditures for aviation and commercial s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908862

28. Measurement of the absorbed dose distribution near Ir192 intravascular brachytherapy seed using a high spatial resolution gel dosimetry system
Topic: Radiation Physics
Published: 5/10/2012
Authors: Ronaldo Minniti, G. Massillon, Michael G Mitch, Christopher Graham Soares
Abstract: The absorbed dose distribution at sub-millimeter distances from the Best single 192Ir intravascular brachytherapy seed was measured using a high spatial resolution gel dosimetry system. Two gel phantoms from the same batch were used; one for the seed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908738

29. Probing the Water Content in Polymer Electrolyte Fuel Cells Using Neutron Radiography
Topic: Radiation Physics
Published: 5/8/2012
Authors: Daniel S Hussey, Jeffrey Mishler, Yun Wang, Rangachary Mukundan, Jacob Spendelow, Rodney Borup
Abstract: This in-situ study examines the water content in polymer electrolyte fuel cells (PEFCs) using neutron radiography. Various conditions such as different polytetraflouroethylene (PTFE) loadings in the gas diffusion media including the micro-porous laye ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910022

30. A Comparison of Harwell & FWT Alanine Temperature Coefficients for 25 °C to 80 °C
Series: Journal of Research (NIST JRES)
Report Number: 117.007
Topic: Radiation Physics
Published: 5/1/2012
Authors: Marc F Desrosiers, Anne M. (Anne Marie) Forney, James M Puhl
Abstract: Dosimeters used to monitor industrial irradiation processing commonly experience significant temperature rises that must be considered in the dose analysis stage. The irradiation-temperature coefficient for a dosimetry system is derived from the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908940



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