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Topic Area: Radiation Physics
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Displaying records 51 to 59.
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51. 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

52. 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

53. 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

54. 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

55. An Automated Ionization Chamber for Secondary Radioactivity Standards
Topic: Radiation Physics
Published: 12/8/2009
Author: Ryan P Fitzgerald
Abstract: We report on the operation and characterization of a new ionization chamber system, called AUTOIC, featuring a commerical digital electrometer and a commerical robotic sample changer. The ralative accuracy of the electrometer was improved significan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903476

56. High contract femtosecond laser-driven intense hard X-ray source for imaging application
Topic: Radiation Physics
Published: 11/18/2009
Authors: Lawrence T Hudson, L.M Chen, W.M. Wang, M. Kando, F Liu, X.X. Lin, J.L Ma, Y.T. Li, S.V. Bulanvo, T. Tajima, Y. Kato, Z.M. Sheng, J Zhang
Abstract: In this report we address the current situation of laser-driven hard X-ray sources for imaging applications,especially the saturation of X-ray conversion efficiency and the serious impact upon imaging quality.By employing high contrast laser pulses ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907448

57. Development of secondary standards for radium-223
Topic: Radiation Physics
Published: 11/5/2009
Authors: Denis E Bergeron, Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: 223Ra is a bone-seeking alpha emitter, and as such is currently being evaluated as a radiopharmaceutical for the treatment of skeletal metastases. In the clinical setting, dosage measurements are typically achieved with reentrant ionization chambers ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903048

58. Effects of high intensity neutron flux on in-situ spin-exchange optical pumping of He-3
Topic: Radiation Physics
Published: 9/17/2009
Authors: Thomas R Gentile, E Babcock, Stephen Boag, C. Becham, T E. Chupp, G L. Jones, A K. Petukhov, T G Walker
Abstract: Prior studies revealed neutron beam-induced alkali-metal spin relaxation in 3He cells polarized in-situ by spin-exchange optical pumping. These effects are minor for neutron beams of low to moderate intensity, but become important at the highest ne ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907869

59. 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.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901345



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