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Topic Area: Radiation Physics

Displaying records 11 to 20 of 72 records.
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11. The Importance of Dosimetry Standardization in Radiobiology
Series: Journal of Research (NIST JRES)
Topic: Radiation Physics
Published: 12/30/2013
Authors: Marc F Desrosiers, Larry A DeWerd, James Deye, Patricia Lindsay, Mark K. Murphy, Michael G Mitch, Francesca Macchiarini, Strahinja Stojadinovic, Helen Stone
Abstract: Radiation dose is central too much of radiobiological research. Precision and accuracy of dose measurements and reporting of the measurement details should be sufficient to allow the work to be interpreted and repeated and to allow valid comparisons ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914094

12. 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

13. Micelle size effect on Fe-55 Liquid Scintillation Efficiency
Topic: Radiation Physics
Published: 12/1/2013
Authors: Denis E Bergeron, Lizbeth Laureano-Perez
Abstract: We used efficiency tracing techniques to study the micelle size effect on liquid scintillation counting of the low-energy Auger electron emitter, 55Fe. We determined micelle hydrodynamic diameters for specific LS cocktails via dynamic light scatteri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913782

14. High-resolution K-shell spectra from laser excited molybdenum plasma
Topic: Radiation Physics
Published: 11/1/2013
Authors: Lawrence T Hudson, C.I Szabo, P Indelicatio, John F Seely, T Ma
Abstract: X-ray spectra from Molybdenum plasmas were recorded by a Cauchois-type cylindrically bent Transmission Crystal Spectrometer (TCS). The absolutely calibrated spectrometer provides an unprecedented resolution of inner shell transitions (K x-ray radiati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912283

15. EUV-Driven Carbonaceous Film Deposition and Its Photo-oxidation on a TiO2 Film Surface
Topic: Radiation Physics
Published: 9/23/2013
Authors: Nadir S. Faradzhev, Monica McEntee, John Yate, Shannon Bradley Hill, Thomas B Lucatorto
Abstract: We report the photo-deposition of a carbonaceous layer grown on a TiO2 thin film by EUV radiation-induced chemistry of adsorbed n-tetradecane and the subsequent photo-oxidation of this film. It is found by chemical analysis of the C layer that irradi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913704

16. A method for organic/inorganic differentiation using an x-ray forward/backscatter personnel scanner
Topic: Radiation Physics
Published: 9/10/2013
Authors: Jack Leigh Glover, Lawrence T Hudson
Abstract: A method is proposed for performing organic/inorganic materials discrimination using an x-ray forward/backscatter scanner. The method is demonstrated using a commercially available personnel security-screening system and requires only image post proc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912853

17. Test Report-Exposure and Ambient dose Equivalent Rate Measurements in Support of the ITRAP+10 Testing
Series: Technical Note (NIST TN)
Report Number: 1800
Topic: Radiation Physics
Published: 8/1/2013
Authors: Leticia S Pibida, Ronaldo Minniti, Larry Lee Lucas, C Michelle O'Brien
Abstract: In this work we studied the response of two different Victoreen® instruments as a function of the exposure rate, the instrument orientation and photon energy. The rate dependence for both instruments is of the order of 8 % over the range of expos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913883

18. Comparison of the standards for air kerma of the NIST and the BIPM for 60Co gamma radiation
Topic: Radiation Physics
Published: 7/31/2013
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 60Co radiation beam of the BIPM in September 2 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913013

19. 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

20. 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



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