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Displaying records 1 to 10 of 22 records.
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1. CT head-scan dosimetry in an anthropomorphic phantom and associated measurement of ACR accreditation-phantom imaging metrics under clinically representative scan conditions
Topic: Radiation Physics
Published: 7/24/2013
Authors: Ronaldo Minniti, Claudia Brunner, Stanley H. Stern, Marie I. Parry, Kish Chakrabarti
Abstract: The purpose of this work was to measure radiation absorbed dose and its distribution in an anthropomorphic head phantom under clinically representative scan conditions in three widely-used computed tomography (CT) scanners, and to relate those dose v ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913449

2. 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

3. 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

4. Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized ^u3^He in the presence of ^u4^He"
Topic: Radiation Physics
Published: 7/24/2013
Authors: Thomas R Gentile, M E Hayden, P.J. Nacher, A K. Petukhov, B Saam, T G Walker
Abstract: H.H. Chen et al [1] claim that adding 4He to spin-exchange optical pumping (SEOP) cells confines 3He atoms to a diffusion-limited region, which effectively reduces the wall relaxation factor X. Here X is a phenomenological parameter used to charact ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912854

5. Comparisons of the radiation protection standards for air kerma of the NIST and the BIPM for Co60 and Cs137 gamma radiation
Topic: Radiation Physics
Published: 8/1/2014
Authors: Ronaldo Minniti, C. Kessler, P J Allisy-Roberts
Abstract: An indirect comparison of the standards for air kerma of the National Institute of Standards and Technology (NIST), USA, and of the Bureau International des Poids et Mesures (BIPM) was carried out in the Co60 and Cs137 radiation protection-level beam ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915926

6. Improved Determination of the Neutron Lifetime
Topic: Radiation Physics
Published: 12/2/2013
Authors: Jeffrey S Nico, A. T. Yue, Maynard S Dewey, David McLarty Gilliam, G L. Greene, A. Laptev, W M. Snow, F. E Wiefeldt
Abstract: The most precise determination of the neutron lifetime using the beam method was completed in 2005 and reported a result of tau_n = (886.3 ± 1.2 [stat] ± 3.2 [sys]) s. The dominant uncertainties were attributed to the absolute determination of the f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914740

7. Improving quantitative neutron radiography through image restoration
Topic: Radiation Physics
Published: 7/20/2013
Authors: Daniel S Hussey, Elias M Baltic, Kevin J Coakley, David L Jacobson
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=910015

8. 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

9. Influence of phantom materials on the energy dependence of LiF:Mg,Ti exposed to low-energy x-rays
Topic: Radiation Physics
Published: 7/8/2014
Authors: Ronaldo Minniti, G. Massillon, Christopher Graham Soares
Abstract: Thermoluminescent (TL) dosimeters, particularly LiF:Mg,Ti (commercially known as TLD-100), are widely used to estimate the absorbed dose received by patients during diagnostic and/or treatment processes and for convenience, measurements are usually m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913210

10. Key comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the NIST, USA and BIPM in accelerator photon beams
Topic: Radiation Physics
Published: 1/23/2013
Authors: Ronald E Tosh, S Picard, D T Burns, P Roger, Fred B Bateman, Huaiyu H Chen-Mayer
Abstract: A comparison of the dosimetry for accelerator photon beams was carried out between the National Institute of Standards and Technology (NIST) and the Bureau International des Poids et Mesures (BIPM) in September and October 2010. The comparison was ba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913069



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