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Topic Area: Radiation Physics
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Displaying records 11 to 20 of 47 records.
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11. 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

12. Comment on “Estimation of organ and effective dose due to Compton backscatter security scans” [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

13. 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

14. 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

15. 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

16. 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

17. 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

18. Response of large area avalanche photodiodes to low energy X-rays
Topic: Radiation Physics
Published: 4/30/2012
Authors: Thomas R Gentile, Uwe Arp, M J Bales, R Farrell
Abstract: For an experiment to study neutron radiative beta-decay, we operated large area avalanche photodiodes (APDs) at liquid nitrogen temperature to detect X-rays with energies between 0.2 keV and 15 keV. Whereas there are numerous reports of X-ray spect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910652

19. Technical Note on Unexpected Bias in NIST 4¿¿ Ionization Chamber Measurements
Topic: Radiation Physics
Published: 4/4/2012
Authors: Michael P Unterweger, Ryan P Fitzgerald
Abstract: The NIST 4π pressurized ionization chamber “A” (PIC “A”) has been the mainstay for secondary calibrations of liquid and gaseous gamma-ray emitting sources for the last 40-45 years. It has also been the main instrument used to measure th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910074

20. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910608