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Topic Area: Radiation Physics

Displaying records 41 to 50 of 59 records.
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41. 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

42. 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

43. Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the NIST, USA and the BIPM in mammography x-rays.
Topic: Radiation Physics
Published: 8/1/2011
Authors: C Michelle O'Brien, C. Kessler, D T Burns
Abstract: A first key comparison has been made between the air-kerma standards of the NIST and the BIPM in mammography x ray beams. The results show the standards to be in agreement at the level of the combined standard uncertainty of 3.2 parts in 10x3. The re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908636

44. Supplementary comparison CCR(IK)-S2 of standards for absorbed dose to water Co-60 gamma radiation at radiation processing dose levels
Topic: Radiation Physics
Published: 7/25/2011
Authors: Marc F Desrosiers, D T Burns, P J Allisy-Roberts, P H Sharpe, M. Pimpinella, V. Lourenco, Y. L Zhang, A Miller, V Generalova, V. Sochor
Abstract: Eight national standards or absorbed dose to water in Co-60 gamma radiation at the dose levels used in radiation processing have been compared over the range from 1 kGy to 30 kGy using the alanine dosimeters of the NIST and the NPL as the transfer do ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908504

45. Energetic Photon Spectra from Targets Irradiated by Picoseconds Lasers
Topic: Radiation Physics
Published: 4/30/2011
Authors: Lawrence T Hudson, John F Seely, Csilla Szabo, Uri Feldman, Hui Chen, Albert Henins
Abstract: Photon spectra in the energy range 60 keV to 1 MeV were recorded from targets irradiated by the LLNL Titan and LLE EP picosecond lasers. The radiation consisted of K shell radiation, Bremsstrahlung radiation from MeV electrons, and preliminary eviden ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907778

46. Efficiency calibrations of cylindrically bent transmission crystals in the 20 keV to 80 keV x-ray range
Topic: Radiation Physics
Published: 4/15/2011
Authors: Lawrence T Hudson, C Michelle O'Brien, Uri Feldman, Stephen M. Seltzer, Hye-Sook Park, John F Seely
Abstract: Two quartz (10-11) crystals were cylindrically bent to 25.4 cm radius of curvature and were mounted in identical Cauchois type transmission spectrometers, and the crystal diffraction efficiencies were measured to 5 % absolute accuracy using narrow ba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907535

47. A Dosimetric Uncertainty Analysis for Photon-Emitting Brachytherapy Sources: Report of the AAPM Task Group No. 138 and GEC-ESTRO
Topic: Radiation Physics
Published: 2/1/2011
Authors: Larry A DeWerd, Geoffrey S Ibbott, Ali S Meigooni, Michael G Mitch, Mark J Rivard, Kurt E Stump, Bruce R Thomadsen, Jack L. Venselaar
Abstract: This report addresses uncertainties pertaining to brachytherapy source dosimetry. The ISO Guide to the Expression of Uncertainty in Measurement (GUM) and the NIST Technical Note 1297 are taken as reference standards for uncertainty formalism. Uncer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904147

48. Scaling studies with the dual crystal spectrometer at the OMEGA-EP laser facility
Topic: Radiation Physics
Published: 10/26/2010
Authors: Lawrence T Hudson, C.I Szabo, J. Workman, K. Flippo, Uri Feldman, Albert Henins
Abstract: The dual crystal spectrometer (DCS) is an approved diagnostic at the OMEGA and the OMEGA-EP laser facilities for the measurement of high energy x-rays in the 11 90 keV energy range, e.g., for verification of the x-ray spectrum of backlighter target ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907469

49. Asymmetrically cut crystal pair as x-ray magnifier for imaging at high intensity laser facilities.
Topic: Radiation Physics
Published: 10/20/2010
Authors: Lawrence T Hudson, Albert Henins, C.I Szabo, Uri Feldman, John F Seely, John J Curry
Abstract: The potential of an x-ray magnifier prepared from a pair of asymmetrically cut crystals is studied to explore high energy x-ray imaging capabilities at high intensity laser facilities. OMEGA-EP and NIF when irradiating mid and high Z targets can be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907468

50. Laser-produced MeV electrons and hard X-ray spectroscopic diagnostics
Topic: Radiation Physics
Published: 7/21/2010
Authors: Lawrence T Hudson, John F Seely
Abstract: A new spectroscopic technique for the measurement of the sizes of hard X-ray sources produced by the irradiation of solid-density targets by intense laser radiation is discussed. The technique is based on the source broadening of K shell spectral li ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907449



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