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You searched on: Author: C O\'Brien

Displaying records 1 to 10 of 16 records.
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1. Methods for characterizing a radiation detector for specifying radiation fields during testing against standards for homeland security applications
Series: Technical Note (NIST TN)
Report Number: 1916
Published: 4/15/2016
Authors: Anne L. Sallaska, Leticia S Pibida, Ronaldo Minniti, C Michelle O\'Brien
Abstract: A wide variability exists among commercial radiation detection instruments used to measure exposure rate or ambient dose equivalent rate. These instruments are used to measure both the radiation background and radioactive sources strengths to det ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920590

2. SIM.RI(I)-K3 Comparison of Calibration Coefficients at Radiotherapy Level for Orthovoltage X-ray Beams
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

3. New National Air-Kerma Standard for Low-Energy Electronic Brachytherapy Sources
Series: Journal of Research (NIST JRES)
Report Number: 119.022
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

4. Test Report-Exposure and Ambient dose Equivalent Rate Measurements in Support of the ITRAP+10 Testing
Series: Technical Note (NIST TN)
Report Number: 1800
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913883

5. Key Comparison BIPM.RI(I)-K2 of the air-kerma standards of the NIST, USA and the BIPM in low-energy x-rays
Published: 3/23/2012
Authors: C Michelle O\'Brien, D T Burns, C Kessler
Abstract: A key comparison has been made between the air-kerma standards of the NIST and the BIPM in the low-energy x ray range. The results show the standards to be in general agreement at the level of the combined standard uncertainty for the comparison of 4 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910332

6. Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the NIST, USA and the BIPM in mammography x-rays.
Published: 8/1/2011
Authors: C Michelle O\'Brien, C. Kessler, D T Burns
Abstract: A first key comparison has been made between the air-kerma standards of the NIST and the BIPM in mammography x ray beams. The results show the standards to be in agreement at the level of the combined standard uncertainty of 3.2 parts in 10x3. The re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908636

7. Efficiency calibrations of cylindrically bent transmission crystals in the 20 keV to 80 keV x-ray range
Published: 4/15/2011
Authors: Lawrence T Hudson, C Michelle O\'Brien, Uri Feldman, Stephen M. Seltzer, Hye-Sook Park, John F Seely
Abstract: Two quartz (10-11) crystals were cylindrically bent to 25.4 cm radius of curvature and were mounted in identical Cauchois type transmission spectrometers, and the crystal diffraction efficiencies were measured to 5 % absolute accuracy using narrow ba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907535

8. Validation Testing of ANSI/IEEE N42.49 Standard Requirements for Personal Emergency Radiation Detectors
Published: 4/30/2010
Authors: Leticia S Pibida, Ronaldo Minniti, C Michelle O\'Brien
Abstract: Various radiation detectors including thirteen electronic Personal Emergency Radiation Detectors (PERDs), radiochromic film cards and thermoluminescent dosimeters (TLDs) were used to validate a subset of the radiological test requirements listed in t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903055

9. Comparison between the NIST and the KEBS for the Determination of Air kerma Calibration Coefficients for Narrow X-ray Spectra and Cs-137 Gamma-Ray Beams
Series: Journal of Research (NIST JRES)
Published: 2/26/2010
Authors: C Michelle O\'Brien, Ronaldo Minniti, Stanslaus Masinza
Abstract: Air kerma calibration coefficients for a reference class ionization chamber from narrow x-ray spectra and cesium 137 gamma ray beams were compared between the National Institute of Standards and Technology (NIST) and the Kenya Bureau of Standards (KE ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903106

10. Comparison of the NIST and PTB Standards for Air Kerma and Low-Energy X-rays
Series: Journal of Research (NIST JRES)
Published: 12/31/2009
Authors: C Michelle O\'Brien, L. Buermann
Abstract: A comparison has been made of the air-kerma standards for low-energy x-rays at the National Institute of Standards and Technology (NIST) and the Physikalisch-Technische Bundesanstalt (PTB). The comparison involved a series of measurements at the PT ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903376



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  • SP 250-XX: Calibration Services
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  • SP 300-XX: Precision Measurement and Calibration
  • SP 400-XX: Semiconductor Measurement Technology
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