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You searched on: Author: Denis Bergeron

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1. Impact of recent change in NIST standard for 18F on the relative response of 68Ge-based mock syringe dose calibrator standards
Published: 7/16/2015
Authors: Brian Edward Zimmerman, Denis E Bergeron, Jeffrey T Cessna
Abstract: As a result of a recent change in the National Institute of Standards and Technology (NIST) activity standard for 18F, we have determined new relative response ratios for a 68Ge solid epoxy mock syringe source used in activity calibrators as a long-l ...

2. Two determinations of the 223Ra half-life
Published: 5/1/2015
Authors: Denis E Bergeron, Ryan P Fitzgerald
Abstract: Ra-223 is an alpha-emitter that is being used as a bone-seeking radiotherapeutic agent. The relatively large uncertainty on its half-life (0.26 %, Bé et al., 2011) is an impediment to precision activity assays. We have performed two series of measure ...

3. Determination of photon emission probabilities for the main gamma-rays of 223Ra in equilibrium with its progeny
Published: 3/11/2015
Authors: Leticia S Pibida, Brian Edward Zimmerman, Ryan P Fitzgerald, Lynne Emily King, Jeffrey T Cessna, Denis E Bergeron
Abstract: The currently published 223Ra gamma-ray emission probabilities display a wide variation in the values depending on the source of the data. The National Institute of Standards and Technology performed activity measurements on a 223Ra solution that was ...

4. Secondary standards for 223Ra revised
Published: 3/5/2015
Authors: Denis E Bergeron, Jeffrey T Cessna, Brian Edward Zimmerman
Abstract: Dose calibrator dial settings reported by NIST in 2010 (ARI v. 68, p. 1367) are now known to give erroneously low (by 10 %) activity readings. The original determinations were based on a chain of calibrations; a broken link in this chain was recentl ...

5. Identification of phase boundaries in surfactant solutions via Compton spectrum quenching,Identification of phase boundaries in surfactant solutions via Compton spectrum quenching
Published: 9/18/2014
Author: Denis E Bergeron
Abstract: The critical micelle concentration and the phase boundary between isolated surfactant molecules and aggregates are probed via fluorescence spectroscopy and a Compton spectrum quenching technique for aqueous and toluenic solutions of Triton X-100 (TX- ...

6. A review of NIST primary activity standards for 18F: 1982 to 2013
Series: Journal of Research (NIST JRES)
Published: 8/27/2014
Authors: Denis E Bergeron, Jeffrey T Cessna, Bert M Coursey, Ryan P Fitzgerald, Brian Edward Zimmerman
Abstract: The new NIST activity standardization for 18F differs from results obtained between 1998 and 2008 by 4 %. The new results are considered to be very reliable; they are based on a battery of robust primary measurement techniques and bring the NIST sta ...

7. Dose calibrator manufacturer-dependent bias in assays of 123I
Published: 3/26/2014
Authors: Denis E Bergeron, Jeffrey T Cessna, Daniel Benjamin Golas, Rheannan K Young, Brian Edward Zimmerman
Abstract: Calibration factors for commercial ionization chambers (i.e. dose calibrators) were determined for a solution of 123I; the activity was based on the 1976 NBS standard. A link between the NIST standard and the International Reference System (SIR) was ...

8. A New NIST Primary Standardization of 18F
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 ...

9. Micelle size effect on Fe-55 Liquid Scintillation Efficiency
Published: 12/1/2013
Authors: Denis E Bergeron, Lizbeth Laureano-Perez
Abstract: We used efficiency tracing techniques to study the micelle size effect on liquid scintillation counting of the low-energy Auger electron emitter, 55Fe. We determined micelle hydrodynamic diameters for specific LS cocktails via dynamic light scatteri ...

10. Calibration of traceable solid mock I-131 phantoms used in an international SPECT image quantification comparison
Series: Journal of Research (NIST JRES)
Report Number: 118.017
Published: 8/15/2013
Authors: Brian Edward Zimmerman, Leticia S Pibida, Lynne Emily King, Denis E Bergeron, Jeffrey T Cessna, Matthew Merril Mille
Abstract: The International Atomic Energy Agency (IAEA) has organized an international comparison to assess Single Photon Emission Computed Tomography (SPECT) image quantification capabilities in 12 countries. Iodine-131 was chosen as the radionuclide for ...

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