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Topic Area: Radiation Physics

Displaying records 31 to 40 of 60 records.
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31. Response of large area avalanche photodiodes to low energy X-rays
Topic: Radiation Physics
Published: 4/30/2012
Authors: Thomas R Gentile, Uwe Arp, M J Bales, R Farrell
Abstract: For an experiment to study neutron radiative beta-decay, we operated large area avalanche photodiodes (APDs) at liquid nitrogen temperature to detect X-rays with energies between 0.2 keV and 15 keV. Whereas there are numerous reports of X-ray spect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910652

32. Technical Note on Unexpected Bias in NIST 4¿¿ Ionization Chamber Measurements
Topic: Radiation Physics
Published: 4/4/2012
Authors: Michael P Unterweger, Ryan P Fitzgerald
Abstract: The NIST 4π pressurized ionization chamber ,AŠ (PIC ,AŠ) has been the mainstay for secondary calibrations of liquid and gaseous gamma-ray emitting sources for the last 40-45 years. It has also been the main instrument used to measure th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910074

33. Measurements for the Development of Simulated Naturally Occurring Radioactive Materials
Series: Journal of Research (NIST JRES)
Report Number: 117.008r2012
Topic: Radiation Physics
Published: 4/3/2012
Author: Leticia S Pibida
Abstract: Nineteen different commercially available samples containing naturally occurring radioactive materials (NORM) (i.e., natural uranium, thorium, radium and potassium) were investigated, including zircon sand, cat litter, roofing tiles, ice melt and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910608

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908685

40. 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



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