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Topic Area: Radiation Physics

Displaying records 31 to 40 of 74 records.
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31. 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

32. Validation Testing of Standard Requirements for Backpack-type Radiation Detectors
Series: Technical Note (NIST TN)
Report Number: 1789
Topic: Radiation Physics
Published: 3/18/2013
Authors: Leticia S Pibida, Bruce R Norman
Abstract: Two gross count and one radionuclide identification backpack-type radiation detectors (BRDs) were used to validate radiological test requirements listed in the Domestic Nuclear Detection Office (DNDO), Technical Capability Standard (TCS) for BRDs ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913250

33. Characterization of the NIST Shellfish Standard Reference Material 4358
Topic: Radiation Physics
Published: 3/1/2013
Authors: Svetlana Nour, Kenneth G Inn, James J Filliben, Hank dan der Gaast, Lee Chung Men, M.D. Calmet, P Povinec, Y Takata, M. Wisdom, K. Nakamura, Pia Vesterbacka, Ching-Chung Huang, S M Vakulovsky
Abstract: A new Shellfish Standard Reference Material (SRM 4358) was developed at the National Institute of Standards and Technology (NIST) via an international intercomparison project that involved 12 laboratories-participants from 9 countries (Table 1). This ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910813

34. 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

35. Correction Factors for the NIST Free-Air Ionization Chambers Used to Realize Air Kerma from W-Anode X-ray Beam
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7887
Topic: Radiation Physics
Published: 10/16/2012
Author: Stephen Michael Seltzer
Abstract: This report details analyses in the development of certain correction factors for free-air ionization chambers used by the National Institute of Standards and Technology to realize air kerma for its measurement standards and calibrations of W-anode x ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911686

36. 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

37. 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

38. Justification of Shielding Requirements for Plutonium Sources
Series: Technical Note (NIST TN)
Report Number: 1758
Topic: Radiation Physics
Published: 9/12/2012
Authors: Leticia S Pibida, Michael P Unterweger
Abstract: This report provides a justification for shielding plutonium sources when testing radiation detection instruments against standard performance requirements and test methods. The use of copper as a shielding material is proposed to provide compara ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912144

39. Comment on ,Estimation of organ and effective dose due to Compton backscatter security scansŠ [Med. Phys. 39, 3396 (2012)]
Topic: Radiation Physics
Published: 9/1/2012
Authors: Lawrence T Hudson, Jack Leigh Glover
Abstract: In the June Issue of Medical Physics, Hoppe and Schmidt presented estimates of the organ and effective dose from an x-ray backscatter scan using a Rapiscan Secure 1000 single pose system . The paper presents Monte Carlo modeling results and takes its ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911687

40. In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source
Topic: Radiation Physics
Published: 7/2/2012
Authors: Thomas R. Gentile, X Tong, C Y Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J Goyette, W-T Lee, A. Parizzi
Abstract: We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). Using the spin exchange optical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911438



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