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Topic Area: Radiation Physics

Displaying records 11 to 20 of 59 records.
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11. Relationship between CTDI values and measured Peak Skin Dose (PSD)
Topic: Radiation Physics
Published: 7/16/2013
Authors: Ronaldo Minniti, Hugo de las Heras Gala, Sean Wilson, Chad Mitchell, Marlene Skopec, Claudia Brunner, Kish Chakrabarti
Abstract: In this work we relate the CT dose index volume (CTDIvol) readily displayed in all CT units with an actual Peak Skin Dose (PSD) value. Measurements of the CTDI and skin exposure were performed simultaneously using an ionization chamber and radiochrom ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910300

12. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913253

13. Wide Angle Polarization Analysis with Neutron Spin Filters
Topic: Radiation Physics
Published: 4/29/2013
Authors: Qiang Ye, Thomas R Gentile, Jeffrey R. Anderson, Collin Leslie Broholm, Wangchun Chen, Z DeLand, Ross W Erwin, C. B. Fu, John E Fuller III, Aaron V Kirchhoff, J. A. Rodriguez-Rivera, V. Thampy, T G Walker, Shannon M Watson
Abstract: We report substantial improvements in a compact wide angle neutron spin filter system that was recently employed on the Multi-Axis Crystal Spectrometer at the Center for Neutron Research at the U.S. National Institute of Standards and Technology. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911975

14. Tungsten L Transition Line Shapes and Energy Shifts Resulting from Ionization in Warm Dense Matter
Topic: Radiation Physics
Published: 4/18/2013
Authors: Lawrence T Hudson, John F Seely, Bruce V. Weber, D. G. Phipps, N. R. Pereira, D Mosher, K. Slabkowska, M. Polasik, J Rzadkiewicz, S Hansen, Uri Feldman, Joseph W. Schumer
Abstract: High resolution spectra of the W L transitions in the energy range 8 keV to 12 keV from warm dense plasmas generated by the Naval Research Laboratory‰s Gamble III pulsed power machine were recorded by a transmission-crystal x-ray spectrometer with ± ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913208

15. Reply to ,Comment on "Testing Three-body Quantum Electrodynamics with Trapped Ti20+ Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation"
Topic: Radiation Physics
Published: 4/12/2013
Authors: Lawrence T Hudson, C T Chantler, M N Kinnane, John D Gillaspy, A.T. Payne, L F Smale, Albert Henins, Joshua M Pomeroy, J A Kimpton, E Takacs, K Makonyi
Abstract: We find that Epp‰s [1] hypothesis - namely that the current experimental data set is well represented by a small constant or zero offset from the predictions of Artemyev et al. [2] - is not supported by standard statistical analysis. We find that add ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913384

16. Characterization of a 6Li-loaded liquid organic scintillator for fast neutron spectrometry and thermal neutron detection
Topic: Radiation Physics
Published: 3/24/2013
Authors: Jeffrey S Nico, C. D. Bass, E J Beise, Craig Heimbach, T. Langford
Abstract: We present the characterization of a liquid scintillator incorporating an aqueous solution of enriched lithium chloride to produce a scintillator with 0.40% 6Li. We report on its performance in terms of optical properties and neutron response. We inc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911570

17. Neutron Test Results of Preliminary Measurements and Calculations Using a Handheld Instrument
Series: Technical Note (NIST TN)
Report Number: 1788
Topic: Radiation Physics
Published: 3/18/2013
Authors: Leticia S Pibida, Craig Heimbach, Bruce R Norman, Alan K Thompson, Maynard S Dewey
Abstract: Initial neutron measurements and calculations were performed to investigate the response of handheld radionuclide identifiers (RIDs) to neutron sources with different moderators/scattering conditions
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913333

18. Validation Testing of Standard Requirements for Backpack-type Radiation Detectors
Series: Technical Note (NIST TN)
Report Number: 1789
Topic: Radiation Physics
Published: 3/18/2013
Authors: Leticia S Pibida, Bruce R Norman
Abstract: Two gross count and one radionuclide identification backpack-type radiation detectors (BRDs) were used to validate radiological test requirements listed in the Domestic Nuclear Detection Office (DNDO), Technical Capability Standard (TCS) for BRDs ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913250

19. Characterization of the NIST Shellfish Standard Reference Material 4358
Topic: Radiation Physics
Published: 3/1/2013
Authors: Svetlana Nour, Kenneth G Inn, James J Filliben, Hank dan der Gaast, Lee Chung Men, M.D. Calmet, P Povinec, Y Takata, M. Wisdom, K. Nakamura, Pia Vesterbacka, Ching-Chung Huang, S M Vakulovsky
Abstract: A new Shellfish Standard Reference Material (SRM 4358) was developed at the National Institute of Standards and Technology (NIST) via an international intercomparison project that involved 12 laboratories-participants from 9 countries (Table 1). This ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910813

20. Correction Factors for the NIST Free-Air Ionization Chambers Used to Realize Air Kerma from W-Anode X-ray Beam
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7887
Topic: Radiation Physics
Published: 10/16/2012
Author: Stephen Michael Seltzer
Abstract: This report details analyses in the development of certain correction factors for free-air ionization chambers used by the National Institute of Standards and Technology to realize air kerma for its measurement standards and calibrations of W-anode x ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911686



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