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Topic Area: Radiation Physics

Displaying records 41 to 50 of 64 records.
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41. 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 ...

42. 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 ...

43. 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, Uri 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- ...

44. 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 ...

45. 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 ...

46. 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, ...

47. 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 ...

48. 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 ...

49. 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 ...

50. 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 ...

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