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Topic Area: Radiation Physics

Displaying records 21 to 30 of 85 records.
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21. Standardization of 237Np
Topic: Radiation Physics
Published: 12/4/2013
Authors: Lizbeth Laureano-Perez, Ryan P Fitzgerald, Ronald Colle
Abstract: The standardization of 237Np was investigated. The certified massic activity for 237Np was obtained by 4 liquid scintillation (LS) counting with correction for the 233Pa daughter using the CIEMAT/NIST efficiency tracing method ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913828

22. 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

23. 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

24. ITRAP+10 Spectroscopic Radiation Portal Monitor Testing
Topic: Radiation Physics
Published: 11/14/2013
Authors: Anne Louise Sallaska, Leticia S Pibida, Huaiyu H Chen-Mayer, Luc Murphy, Christina Ward
Abstract: The Illicit Trafficking Radiation Assessment Program (ITRAP+10) is an international effort of the Department of Homeland Security‰s Domestic Nuclear Detection Office (DHS/DNDO), the European Commission‰s Joint Research Center (EC-JRC), and the In ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914269

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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



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