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Topic Area: Radiation Physics
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Displaying records 41 to 50 of 85 records.
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41. Laser-produced MeV electrons and hard X-ray spectroscopic diagnostics
Topic: Radiation Physics
Published: 7/21/2010
Authors: Lawrence T Hudson, John F Seely
Abstract: A new spectroscopic technique for the measurement of the sizes of hard X-ray sources produced by the irradiation of solid-density targets by intense laser radiation is discussed. The technique is based on the source broadening of K shell spectral li ...

42. Lattice damage in superconducting microcalorimeter detectors
Topic: Radiation Physics
Published: 6/3/2013
Authors: Robert Daniel Horansky, Joel Nathan Ullom, Michael W Rabin
Abstract: There is currently significant interest in using superconducting detectors for measurement of ion kinetic energies. Unprecedented resolution is possible with an order of magnitude improvement over semiconductors. Superconducting detectors are now ...

43. Look at Data to Evaluate Uncertainty: A comment on "Uranium Assay Determination...." by Mathew et al.
Topic: Radiation Physics
Published: 2/25/2010
Author: Ryan P Fitzgerald
Abstract: According to the Guide to the Expression of Uncertainty in Measurement (GUM), the evaluation of uncertainty should be based as much as possible on observed data. In a recent paper, Mathew et al. detailed, for a specific titration-based assay of urani ...

44. Making Kilopixel X-Ray Microcalorimeter Arrays a Reality
Topic: Radiation Physics
Published: 2/9/2009
Authors: William Bertrand Doriese, Megan E. Eckart
Abstract: To enable unprecedented imaging X-ray spectroscopy, scientists at NASA's Goddard Space Flight Center and the National Institute of Standards and Technology are developing arrays of high-resolution microcalorimeters and their readout.

45. Measurement Traceability in Medical Physics
Topic: Radiation Physics
Published: 1/1/2014
Author: Lisa R Karam
Abstract: Medical physics, the joining of physics with healthcare, requires a level of quality assurance beyond many applications of the physical sciences. Always the health, and often the life, of the patient depends on the precise and accurate implementation ...

46. Measurement of the O2O3O4 and O3O4O5 Super Coster-Kronig Rates in Tungsten via Asymmetric Diffraction Spectrometry
Topic: Radiation Physics
Published: 3/7/2014
Authors: Lawrence T Hudson, John F Seely, Jack Leigh Glover, Yuri Ralchenko, Nino R Pereira, Uri Feldman
Abstract: The tungsten Lγ transitions between 11 keV and 12 keV and Kα transitions from 57 keV to 60 keV were produced by a laboratory electron-bombarded x-ray source and simultaneously recorded with high-resolution by using multiple diffraction plan ...

47. 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 ...

48. 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 ...

49. Measurements for the Development of Simulated Naturally Occurring Radioactive Materials
Series: Journal of Research (NIST JRES)
Report Number: 117.008r2012
Topic: Radiation Physics
Published: 4/3/2012
Author: Leticia S Pibida
Abstract: Nineteen different commercially available samples containing naturally occurring radioactive materials (NORM) (i.e., natural uranium, thorium, radium and potassium) were investigated, including zircon sand, cat litter, roofing tiles, ice melt and ...

50. Micelle size effect on Fe-55 Liquid Scintillation Efficiency
Topic: Radiation Physics
Published: 12/1/2013
Authors: Denis E Bergeron, Lizbeth Laureano-Perez
Abstract: We used efficiency tracing techniques to study the micelle size effect on liquid scintillation counting of the low-energy Auger electron emitter, 55Fe. We determined micelle hydrodynamic diameters for specific LS cocktails via dynamic light scatteri ...

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