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Topic Area: Radiation Physics
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Displaying records 51 to 60 of 82 records.
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51. New Methods for Measurement of Neutron Detector Efficiency up to 20 MeV
Topic: Radiation Physics
Published: 12/1/2014
Authors: Fred B Bateman, Allan David Carlson, N. A. Kornilov, S M Grimes, T N Massey, C E Brient, D E. Carter, J E. O'Donnell, R. C. Haight, N Boukharouba
Abstract: A new approach to neutron detector effciency has been taken. A neutron detector has been calibrated with a Cf-252 source at low energy. The calibration was extended to higher neutron energies by use of symetric reactions such as A + A ! (2A - 1) + ...

52. New National Air-Kerma Standard for Low-Energy Electronic Brachytherapy Sources
Series: Journal of Research (NIST JRES)
Topic: Radiation Physics
Published: 10/6/2014
Authors: Stephen Michael Seltzer, C Michelle O'Brien, Michael G Mitch
Abstract: The purpose of this report is to document the NIST air-kerma measurement standard for the electronic brachytherapy sources, i.e., the Axxent sources of Xoft, Inc., which operate at tube potentials of 50 kV and anode currents of 300 μA. The use ...

53. New x-ray measurements shed light on discrepancy between experiment and QED
Topic: Radiation Physics
Published: 12/15/2014
Authors: Lawrence T Hudson, C T Chantler, A.T. Payne, M N Kinnane, John D Gillaspy, L F Smale, Albert Henins, J A Kimpton, E Takacs
Abstract: Quantum Electro-Dynamics (QED) is the best tested theory of our physical world, yet significant disagreements have emerged between attempts to apply QED to exotic atomic systems. A recent 15 parts-per-million (ppm) experiment on muonic hydrogen, in ...

54. Noble Gas Excimer Scintillation Following Neutron Capture in Boron Thin Films
Topic: Radiation Physics
Published: 4/11/2014
Authors: Alan K Thompson, Jacob McComb, Charles W Clark, Michael A. Coplan, Mohamad Al-Sheikhly, Robert Edward Vest
Abstract: Far-ultraviolet (FUV) scintillation signals have been measured in heavy noble gases (argon, krypton, xenon) following boron-neutron capture (10B(n,α)7Li) in 10B thin films. The observed scintillation yields are comparable to the yields from some ...

55. Optimal filtering, record length, and count rate in transition-edge-sensor microcalorimeters
Topic: Radiation Physics
Published: 12/16/2009
Authors: William Bertrand Doriese, Gene C Hilton, Kent D Irwin, Francis Joseph Schima, Joel Nathan Ullom, Joseph S. Adams, Caroline A. Kilbourne
Abstract: In typical algorithms for optimally filtering transition-edge-sensor-microcalorimeter pulses, the average value of a filtered pulse is set to zero. The achieved energy resolution of the detector then depends strongly on the chosen length of the pulse ...

56. Pinhole X -ray camera photos of an ECR ion source plasma
Topic: Radiation Physics
Published: 11/1/2011
Authors: Lawrence T Hudson, Sandor Biri, E Takacs, R. Racz, J. Palinkas
Abstract: A 70 micrometer pinhole and an X-ray CCD camera in single photon counting mode were used to obtain spatially and spectral resolved images of an electron cyclotron resonance (ECR) ion source generated plasma. The method has good spatial resolution as ...

57. Polarized 3HE Spin Filters for Neutron Science
Topic: Radiation Physics
Published: 2/12/2014
Authors: Thomas R. Gentile, Wei-Chen N. Chen
Abstract: The large spin dependence of the absorption cross section for neutrons by 3He gas provides a method to polarize neutron beams. For certain applications, such polarized 3He-based neutron "spin filters" have advantages over conventional neutron optica ...

58. Post-Irradiation Study of the Alanine Dosimeter
Series: Journal of Research (NIST JRES)
Topic: Radiation Physics
Published: 7/14/2014
Author: Marc F Desrosiers
Abstract: Post-irradiation stability of high-dose dosimeters has traditionally been an important measurement influence quantity. Though the exceptional stability of the alanine dosimeter response with time has rendered this factor a non-issue for routine work ...

59. 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 ...

60. Recommendations for Improving Consistency in the Radiation Fields used During Testing of Radiation Detection Instruments for Homeland Security Applications
Series: Journal of Research (NIST JRES)
Report Number: 118.014
Topic: Radiation Physics
Published: 5/28/2013
Authors: Matthew Merril Mille, Bruce R Norman, Leticia S Pibida
Abstract: Several measurements and calculations were performed to illustrate the differences that can be observed in the determination of exposure rate or ambient dose equivalent rate used for testing radiation detection systems against consensus standard. ...

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