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Topic Area: Radiation Physics

Displaying records 21 to 30 of 47 records.
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21. Key Comparison BIPM.RI(I)-K2 of the air-kerma standards of the NIST, USA and the BIPM in low-energy x-rays
Topic: Radiation Physics
Published: 3/23/2012
Authors: C Michelle O'Brien, D T Burns, C Kessler
Abstract: A key comparison has been made between the air-kerma standards of the NIST and the BIPM in the low-energy x ray range. The results show the standards to be in general agreement at the level of the combined standard uncertainty for the comparison of 4 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910332

22. Extending transmission crystal x-ray spectroscopy to moderate-intensity laser driven sources
Topic: Radiation Physics
Published: 3/17/2012
Authors: Lawrence T Hudson, J. Y. Mao, L. M. Chen, John F Seely, L. Zhang, Y. Q. Sun, X. X. Lin, J. Zhang
Abstract: We present spectroscopic measurements of characteristic Kα and Kβ emissions from Mo targets irradiated by a 100 fs, 200 mJ, Ti: sapphire laser with intensity of 1017 W/cm2 to 1018 W/cm2 per pulse. This research pursues novel x-ray sources f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910310

23. Laboratories New to the ICRM
Topic: Radiation Physics
Published: 3/4/2012
Authors: Lisa R Karam, Marios J. Anagnostakis, Arunas Gudelis, Pujadi Marsoem, Alexander Mauring, Gatot Wurdiyanto, Ulku Yucel
Abstract: The Scientific Committee of the ICRM decided, for the 2011 Conference, to present laboratories that are at a key developmental stage in establishing, expanding or applying radionuclide metrology capabilities. The expansion of radionuclide metrology ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910083

24. The effect of impurities on calculated activity in the triple-to-double coincidence ratio liquid scintillation method
Topic: Radiation Physics
Published: 3/4/2012
Authors: Denis E Bergeron, Ryan P Fitzgerald, Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: In the triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting, unaccounted or improperly accounted impurities can result in lower-than-expected or higher-than-expected recovered activities, depending on the counting efficie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909218

25. Determination of micelle size in some commercial liquid scintillation cocktails
Topic: Radiation Physics
Published: 3/3/2012
Author: Denis E Bergeron
Abstract: We performed dynamic light scattering measurements on commercially available liquid scintillation (LS) cocktails over a range of aqueous and acid contents. In all cases, we measured hydrodynamic diameters substantially smaller than the current de fa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908599

26. Absolute measurements of x-ray backlighter sources at energies above 10 keVa)
Topic: Radiation Physics
Published: 2/1/2012
Authors: Lawrence T Hudson, B.R. Maddox, H.S. Parks, B A Remington, C. Chen, S Chen, S. T. Prisbrey, A. Comley, C A Back, C. Szabo, John F Seely, U. Feldman, Stephen Michael Seltzer, M. J. Haugh, Z. Ali
Abstract: Line emission and broadband x-ray sources with x-ray energies above 10 keV have been investigated using a range of calibrated x-ray detectors for use as x-ray backlighters in high energy density (HED) experiments. The conversion efficiency of short- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908685

27. Effect of Neutron Irradiation on Dosimetric Properties of the TLD-600H (Lif6:Mg,Cu,P)
Topic: Radiation Physics
Published: 11/1/2011
Authors: A A Romanyukha, Ronaldo Minniti, M. Moscovitch, Alan K Thompson, F. Trompier, Ronald Colle, A Sucheta, S. P. Voss, L. A. Benevides
Abstract: Ideally, dosimeters should measure the dose without their dosimetric properties being affected by the radiation type being measured. Industry-wide occupational radiation workers that can be potentially exposed to neutron radiation fields are routine ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905722

28. Pinhole X -ray camera photos of an ECR ion source plasma
Topic: Radiation Physics
Published: 11/1/2011
Authors: Lawrence T Hudson, Sandor Biri, E Takacs, R. Racz, J. Palinkas
Abstract: A 70 micrometer pinhole and an X-ray CCD camera in single photon counting mode were used to obtain spatially and spectral resolved images of an electron cyclotron resonance (ECR) ion source generated plasma. The method has good spatial resolution as ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907522

29. Calculations of electron stopping powers for 41 elemental solids over the 50 eV to 30 keV range with the full Penn algorithm
Topic: Radiation Physics
Published: 9/19/2011
Authors: Cedric John Powell, David R. Penn, H Shinotsuka, Shigeo Tanuma
Abstract: We present collision electron stopping powers (SPs) for 41 elemental solids (Li, Be, graphite, diamond, glassy C, Na, Mg, Al, Si, K, Sc, Ti, V, Cr, Fe, Co, Ni, Cu, Ge, Y, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Cs, Gd, Tb, Dy, Hf, Ta, W, Re, Os, Ir, Pt, Au, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907763

30. Emergency Radiobioassay Preparedness Exercises through the NIST Radiochemistry Intercomparison Program (NRIP)
Topic: Radiation Physics
Published: 8/1/2011
Authors: Svetlana Nour, Jerome LaRosa, Kenneth G Inn
Abstract: The present challenge for the international radiobioassay community is to analyze contaminated samples rapidly while maintaining high quality results. NIST runs a radiobioassay measurement traceability testing program to evaluate the radioanalytical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906938