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You searched on: Topic Area: Radiation Physics

Displaying records 1 to 10 of 23 records.
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1. Uncertainties in Internal Gas Counting
Topic: Radiation Physics
Published: 5/22/2015
Authors: Michael P Unterweger, L Johansson, M Rodriques, A Yunoki, Lisa R Karam
Abstract: The uncertainties in internal gas counting can, for the most part, be split into two areas: counting and sample gas measurement uncertainties and the counting uncertainties. The former includes measurements of counting and sample gas quantities and a ...

2. 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 ...

3. 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 ...

4. 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 ...

5. 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 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 ...

6. 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 ...

7. 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 ...

8. Improved Determination of the Neutron Lifetime
Topic: Radiation Physics
Published: 12/2/2013
Authors: Jeffrey S Nico, A. T. Yue, Maynard S Dewey, David McLarty Gilliam, G L. Greene, A. Laptev, W M. Snow, F. E Wiefeldt
Abstract: The most precise determination of the neutron lifetime using the beam method was completed in 2005 and reported a result of tau_n = (886.3 ± 1.2 [stat] ± 3.2 [sys]) s. The dominant uncertainties were attributed to the absolute determination of the f ...

9. 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 ...

10. CT head-scan dosimetry in an anthropomorphic phantom and associated measurement of ACR accreditation-phantom imaging metrics under clinically representative scan conditions
Topic: Radiation Physics
Published: 7/24/2013
Authors: Ronaldo Minniti, Claudia Brunner, Stanley H. Stern, Marie I. Parry, Kish Chakrabarti
Abstract: The purpose of this work was to measure radiation absorbed dose and its distribution in an anthropomorphic head phantom under clinically representative scan conditions in three widely-used computed tomography (CT) scanners, and to relate those dose v ...

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