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You searched on: Topic Area: Radiation Physics Sorted by: title

Displaying records 11 to 20 of 26 records.
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11. Key comparison BIPM.RI(I)-K6 of the standards for absorbed dose to water of the NIST, USA and BIPM in accelerator photon beams
Topic: Radiation Physics
Published: 1/23/2013
Authors: Ronald E Tosh, S Picard, D T Burns, P Roger, Fred B Bateman, Huaiyu H Chen-Mayer
Abstract: A comparison of the dosimetry for accelerator photon beams was carried out between the National Institute of Standards and Technology (NIST) and the Bureau International des Poids et Mesures (BIPM) in September and October 2010. The comparison was ba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913069

12. Measurement Traceability in Medical Physics
Topic: Radiation Physics
Published: 1/1/2014
Author: Lisa R Karam
Abstract: Medical physics, the joining of physics with healthcare, requires a level of quality assurance beyond many applications of the physical sciences. Always the health, and often the life, of the patient depends on the precise and accurate implementation ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915256

13. 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

14. Neutron Test Results of Preliminary Measurements and Calculations Using a Handheld Instrument
Series: Technical Note (NIST TN)
Report Number: 1788
Topic: Radiation Physics
Published: 3/18/2013
Authors: Leticia S Pibida, Craig Heimbach, Bruce R Norman, Alan K Thompson, Maynard S Dewey
Abstract: Initial neutron measurements and calculations were performed to investigate the response of handheld radionuclide identifiers (RIDs) to neutron sources with different moderators/scattering conditions
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913333

15. New National Air-Kerma Standard for Low-Energy Electronic Brachytherapy Sources
Series: Journal of Research (NIST JRES)
Report Number: 119.022
Topic: Radiation Physics
Published: 10/6/2014
Authors: Stephen Michael Seltzer, C Michelle O\'Brien, Michael G Mitch
Abstract: The purpose of this report is to document the NIST air-kerma measurement standard for the electronic brachytherapy sources, i.e., the Axxent sources of Xoft, Inc., which operate at tube potentials of 50 kV and anode currents of 300 μA. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916273

16. On the limits of spin-exchange optical pumping of 3He
Topic: Radiation Physics
Published: 7/2/2014
Authors: Thomas R. Gentile, T G Walker, E Babcock, Qiang NMN Ye, WangChun Chen
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 n ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914927

17. Polarized 3HE Spin Filters for Neutron Science
Topic: Radiation Physics
Published: 2/12/2014
Authors: Thomas R. Gentile, Wei-Chen N. Chen
Abstract: The large spin dependence of the absorption cross section for neutrons by 3He gas provides a method to polarize neutron beams. For certain applications, such polarized 3He-based neutron "spin filters" have advantages over conventional neutron optica ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914929

18. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913253

19. SIM.RI(I)-K3 Comparison of Calibration Coefficients at Radiotherapy Level for Orthovoltage X-ray Beams
Topic: Radiation Physics
Published: 2/2/2015
Authors: C Michelle O\'Brien, J.P. McCaffrey,, H Shen, M Saravi, G Montano Ortiz, G Stefanic, M Carlos, C.N.M. da Silva, J L Alvarez, V Tovar
Abstract: Air-kerma calibration coefficients were compared at the radiotherapy level for orthovoltage x-ray beams in the SIM.RI(I)-K3 comparison for members of the Sistema Interamericano de Metrología (SIM). Five SIM laboratories participated in the comparison ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919564

20. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911424



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