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Topic Area: Radiation Physics
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Displaying records 61 to 70 of 72 records.
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61. Spin-exchange optical pumping of He3 with VHG-narrowed diode bar laser
Topic: Radiation Physics
Published: 7/2/2014
Authors: Thomas R. Gentile, Wei-Chen N. Chen, T G Walker, E Babcock, Qiang NMN Ye
Abstract: Using diode bar lasers spectrally narrowed with chirped volume holographic gratings (VHGs), we have obtained an improvement in the 3He polarization achievable by spin-exchange optical pumping (SEOP). As compared to our past results with lasers narro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914927

62. Standardization of Broadband UV Measurements
Topic: Radiation Physics
Published: 1/1/2013
Author: George P Eppeldauer
Abstract: The CIE standardized rectangular-shape UV response functions can be realized only with large spectral mismatch errors. The spectral power-distribution of UV sources is not standardized. Accordingly, the readings of different types of UV meters, even ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913173

63. 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

64. 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

65. 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

66. Testing Three-body Quantum Electrodynamics with Trapped Ti-20 Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation
Topic: Radiation Physics
Published: 10/10/2012
Authors: Lawrence T Hudson, C T Chantler, Mark N. Kinnane, John D Gillaspy, A.T. Payne, L F Smale, Albert Henins, Joseph N Tan, J A Kimpton, E Takacs, K Makonyi, Joshua M Pomeroy
Abstract: We report the measurement of the w (1s2p 1P1 ! 1s2 1S0) resonance line transition energy in helium-like titanium. Our result, 4749.85(7) eV, deviates from the most recent ab initio prediction by three times our experimental uncertainty and by many ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911171

67. The Importance of Dosimetry Standardization in Radiobiology
Series: Journal of Research (NIST JRES)
Topic: Radiation Physics
Published: 12/30/2013
Authors: Marc F Desrosiers, Larry A DeWerd, James Deye, Patricia Lindsay, Mark K. Murphy, Michael G Mitch, Francesca Macchiarini, Strahinja Stojadinovic, Helen Stone
Abstract: Radiation dose is central too much of radiobiological research. Precision and accuracy of dose measurements and reporting of the measurement details should be sufficient to allow the work to be interpreted and repeated and to allow valid comparisons ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914094

68. 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

69. Tungsten L Transition Line Shapes and Energy Shifts Resulting from Ionization in Warm Dense Matter
Topic: Radiation Physics
Published: 4/18/2013
Authors: Lawrence T Hudson, John F Seely, Bruce V. Weber, D. G. Phipps, N. R. Pereira, D Mosher, K. Slabkowska, M. Polasik, J Rzadkiewicz, S Hansen, Uri Feldman, Joseph W. Schumer
Abstract: High resolution spectra of the W L transitions in the energy range 8 keV to 12 keV from warm dense plasmas generated by the Naval Research Laboratory‰s Gamble III pulsed power machine were recorded by a transmission-crystal x-ray spectrometer with ± ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913208

70. Validation Testing of ANSI/IEEE N42.49 Standard Requirements for Personal Emergency Radiation Detectors
Topic: Radiation Physics
Published: 4/30/2010
Authors: Leticia S Pibida, Ronaldo Minniti, C Michelle O'Brien
Abstract: Various radiation detectors including thirteen electronic Personal Emergency Radiation Detectors (PERDs), radiochromic film cards and thermoluminescent dosimeters (TLDs) were used to validate a subset of the radiological test requirements listed in t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903055



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