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Topic Area: Radiation Physics

Displaying records 61 to 70 of 75 records.
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61. Energetic Photon Spectra from Targets Irradiated by Picoseconds Lasers
Topic: Radiation Physics
Published: 4/30/2011
Authors: Lawrence T Hudson, John F Seely, Csilla Szabo, Uri Feldman, Hui Chen, Albert Henins
Abstract: Photon spectra in the energy range 60 keV to 1 MeV were recorded from targets irradiated by the LLNL Titan and LLE EP picosecond lasers. The radiation consisted of K shell radiation, Bremsstrahlung radiation from MeV electrons, and preliminary eviden ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907778

62. Efficiency calibrations of cylindrically bent transmission crystals in the 20 keV to 80 keV x-ray range
Topic: Radiation Physics
Published: 4/15/2011
Authors: Lawrence T Hudson, C Michelle O'Brien, Uri Feldman, Stephen M. Seltzer, Hye-Sook Park, John F Seely
Abstract: Two quartz (10-11) crystals were cylindrically bent to 25.4 cm radius of curvature and were mounted in identical Cauchois type transmission spectrometers, and the crystal diffraction efficiencies were measured to 5 % absolute accuracy using narrow ba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907535

63. A Dosimetric Uncertainty Analysis for Photon-Emitting Brachytherapy Sources: Report of the AAPM Task Group No. 138 and GEC-ESTRO
Topic: Radiation Physics
Published: 2/1/2011
Authors: Larry A DeWerd, Geoffrey S Ibbott, Ali S Meigooni, Michael G Mitch, Mark J Rivard, Kurt E Stump, Bruce R Thomadsen, Jack L. Venselaar
Abstract: This report addresses uncertainties pertaining to brachytherapy source dosimetry. The ISO Guide to the Expression of Uncertainty in Measurement (GUM) and the NIST Technical Note 1297 are taken as reference standards for uncertainty formalism. Uncer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904147

64. Scaling studies with the dual crystal spectrometer at the OMEGA-EP laser facility
Topic: Radiation Physics
Published: 10/26/2010
Authors: Lawrence T Hudson, C.I Szabo, J. Workman, K. Flippo, Uri Feldman, Albert Henins
Abstract: The dual crystal spectrometer (DCS) is an approved diagnostic at the OMEGA and the OMEGA-EP laser facilities for the measurement of high energy x-rays in the 11 90 keV energy range, e.g., for verification of the x-ray spectrum of backlighter target ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907469

65. Asymmetrically cut crystal pair as x-ray magnifier for imaging at high intensity laser facilities.
Topic: Radiation Physics
Published: 10/20/2010
Authors: Lawrence T Hudson, Albert Henins, C.I Szabo, Uri Feldman, John F Seely, John J Curry
Abstract: The potential of an x-ray magnifier prepared from a pair of asymmetrically cut crystals is studied to explore high energy x-ray imaging capabilities at high intensity laser facilities. OMEGA-EP and NIF when irradiating mid and high Z targets can be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907468

66. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907449

67. Validation Testing of ANSI/IEEE N42.49 Standard Requirements for Personal Emergency Radiation Detectors
Topic: Radiation Physics
Published: 4/30/2010
Authors: Leticia S Pibida, Ronaldo Minniti, C Michelle O'Brien
Abstract: Various radiation detectors including thirteen electronic Personal Emergency Radiation Detectors (PERDs), radiochromic film cards and thermoluminescent dosimeters (TLDs) were used to validate a subset of the radiological test requirements listed in t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903055

68. Development of a traceable calibration methodology for solid Ge-68/Ga-68 sources used as a calibration surrogate for F-18 in radionuclide activity calibrations
Topic: Radiation Physics
Published: 3/31/2010
Authors: Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: We have developed a methodology for calibrating 68Ge radioactivity content in a commercially-available calibration source for dose calibrators in a way that is traceable to the national standard. Additionally, the source was cross-calibrated for equi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902879

69. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904570

70. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903257



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