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Topic Area: Radiation Physics
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Displaying records 61 to 70 of 85 records.
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61. Potential Hazard Due to Induced Radioactivity Secondary to Radiotherapy: The Report of AAPM Task Group 136
Topic: Radiation Physics
Published: 12/1/2014
Authors: Fred B Bateman, Bruce R Thomadsen, Ravinder Nath, Jonathan Farr, Cal Glisson, Mohammad K. Islam, T. LaFrance, M. E. Moore, X. George Xu, Mark Yudelev
Abstract: External-beam radiation therapy mostly uses high-energy photons (x-rays) produced by medical accelerators but many facilities now use proton beams and a few use neutrons. High energy photons offer several advantages over lower energy photons in terms ...

62. Probing the Water Content in Polymer Electrolyte Fuel Cells Using Neutron Radiography
Topic: Radiation Physics
Published: 5/8/2012
Authors: Daniel S Hussey, Jeffrey Mishler, Yun Wang, Rangachary Mukundan, Jacob Spendelow, Rodney Borup
Abstract: This in-situ study examines the water content in polymer electrolyte fuel cells (PEFCs) using neutron radiography. Various conditions such as different polytetraflouroethylene (PTFE) loadings in the gas diffusion media including the micro-porous laye ...

63. Recommendations for Improving Consistency in the Radiation Fields used During Testing of Radiation Detection Instruments for Homeland Security Applications
Series: Journal of Research (NIST JRES)
Report Number: 118.014
Topic: Radiation Physics
Published: 5/28/2013
Authors: Matthew Merril Mille, Bruce R Norman, Leticia S Pibida
Abstract: Several measurements and calculations were performed to illustrate the differences that can be observed in the determination of exposure rate or ambient dose equivalent rate used for testing radiation detection systems against consensus standard. ...

64. Relationship between CTDI values and measured Peak Skin Dose (PSD)
Topic: Radiation Physics
Published: 7/16/2013
Authors: Ronaldo Minniti, Hugo de las Heras Gala, Sean Wilson, Chad Mitchell, Marlene Skopec, Claudia Brunner, Kish Chakrabarti
Abstract: In this work we relate the CT dose index volume (CTDIvol) readily displayed in all CT units with an actual Peak Skin Dose (PSD) value. Measurements of the CTDI and skin exposure were performed simultaneously using an ionization chamber and radiochrom ...

65. Reply to ,Comment on "Testing Three-body Quantum Electrodynamics with Trapped Ti20+ Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation"
Topic: Radiation Physics
Published: 4/12/2013
Authors: Lawrence T Hudson, C T Chantler, M N Kinnane, John D Gillaspy, A.T. Payne, L F Smale, Albert Henins, Joshua M Pomeroy, J A Kimpton, E Takacs, K Makonyi
Abstract: We find that Epp‰s [1] hypothesis - namely that the current experimental data set is well represented by a small constant or zero offset from the predictions of Artemyev et al. [2] - is not supported by standard statistical analysis. We find that add ...

66. 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 ...

67. Review of Pavel P. Povinec, Katsumi Hirose, Michio Aoyama (2013) Fukushima Accident: Radioactivity Impact on the Environment, Elsevier ISBN-10: 0124081320
Topic: Radiation Physics
Published: 1/1/2015
Authors: Mark Anthony Tyra, Jacqueline L Mann

68. 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 ...

69. Search for a T-odd, P-even Triple Correlation in Neutron Decay
Topic: Radiation Physics
Published: 9/14/2012
Authors: Jeffrey S Nico, T E. Chupp, K P Coulter, R L Cooper, S. J. Freeman, B. K. Fujikawa, A. Garcia, G L. Jones, Hans P Mumm, Alan K Thompson, C A Trull, F. E Wiefeldt, J. F. Wilkerson
Abstract: Time-reversal-invariance (T) violation, or equivalently, assuming charge-conjugation-parity-time-reversal (CPT) invariance, CP violation may explain the observed cosmological baryon asymmetry as well as signal physics beyond the Standard Model. In th ...

70. 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 ...

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