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Topic Area: Radiation Physics
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Displaying records 1 to 10 of 72 records.
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1. Comparisons of the radiation protection standards for air kerma of the NIST and the BIPM for Co60 and Cs137 gamma radiation
Topic: Radiation Physics
Published: 8/1/2014
Authors: Ronaldo Minniti, C. Kessler, P J Allisy-Roberts
Abstract: An indirect comparison of the standards for air kerma of the National Institute of Standards and Technology (NIST), USA, and of the Bureau International des Poids et Mesures (BIPM) was carried out in the Co60 and Cs137 radiation protection-level beam ...

2. Post-Irradiation Study of the Alanine Dosimeter
Series: Journal of Research (NIST JRES)
Topic: Radiation Physics
Published: 7/14/2014
Author: Marc F Desrosiers
Abstract: Post-irradiation stability of high-dose dosimeters has traditionally been an important measurement influence quantity. Though the exceptional stability of the alanine dosimeter response with time has rendered this factor a non-issue for routine work ...

3. Influence of phantom materials on the energy dependence of LiF:Mg,Ti exposed to low-energy x-rays
Topic: Radiation Physics
Published: 7/8/2014
Authors: Ronaldo Minniti, G. Massillon, Christopher Graham Soares
Abstract: Thermoluminescent (TL) dosimeters, particularly LiF:Mg,Ti (commercially known as TLD-100), are widely used to estimate the absorbed dose received by patients during diagnostic and/or treatment processes and for convenience, measurements are usually m ...

4. 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 ...

5. Effects of Dose Fractionation on the Response of Alanine Dosimetry
Topic: Radiation Physics
Published: 6/28/2014
Authors: Marc F Desrosiers, John Logar, Brad Lundahl
Abstract: Alanine dosimetry is well established as a transfer standard and is becoming more prevalently used as a routine dosimetry system for radiation processing. Many routine measurement applications in radiation processing involve absorbed dose measurement ...

6. Noble Gas Excimer Scintillation Following Neutron Capture in Boron Thin Films
Topic: Radiation Physics
Published: 4/11/2014
Authors: Alan K Thompson, Jacob McComb, Charles W Clark, Michael A. Coplan, Mohamad Al-Sheikhly, Robert Edward Vest
Abstract: Far-ultraviolet (FUV) scintillation signals have been measured in heavy noble gases (argon, krypton, xenon) following boron-neutron capture (10B(n,α)7Li) in 10B thin films. The observed scintillation yields are comparable to the yields from some ...

7. Measurement of the O2O3O4 and O3O4O5 Super Coster-Kronig Rates in Tungsten via Asymmetric Diffraction Spectrometry
Topic: Radiation Physics
Published: 3/7/2014
Authors: Lawrence T Hudson, John F Seely, Jack Leigh Glover, Yuri Ralchenko, Nino R Pereira, Uri Feldman
Abstract: The tungsten Lγ transitions between 11 keV and 12 keV and Kα transitions from 57 keV to 60 keV were produced by a laboratory electron-bombarded x-ray source and simultaneously recorded with high-resolution by using multiple diffraction plan ...

8. 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 ...

9. A New NIST Primary Standardization of 18F
Topic: Radiation Physics
Published: 2/1/2014
Authors: Ryan P Fitzgerald, Brian Edward Zimmerman, Denis E Bergeron, Jeffrey T Cessna, Leticia S Pibida, Denise S Moreira
Abstract: A new primary standardization of 18F by NIST is reported. The standard is based on live-timed beta- gamma anticoincidence counting with confirmatory measurements by three other methods: (i) liquid scintillation (LS) counting using CIEMAT/NIST 3H e ...

10. 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 ...

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