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You searched on: Author: Denis Bergeron

Displaying records 1 to 10 of 25 records.
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1. Micellar phase boundaries under the influence of ethyl alcohol
Published: 5/16/2016
Author: Denis E Bergeron
Abstract: The Compton spectrum quenching technique is used to monitor the effect of ethyl alcohol (EtOH) additions on phase boundaries in two systems. In toluenic solutions of the nonionic surfactant, Triton X-100, EtOH shifts the boundary separating the first ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918032

2. (Mis)use of 133Ba as a calibration surrogate for 131I in clinical activity calibrators
Published: 3/1/2016
Authors: Brian Edward Zimmerman, Denis E Bergeron
Abstract: Using NIST-calibrated solutions of 131Ba and 131I in the 5 mL NIST ampoule geometry, measurements were made in three NIST-maintained Capintec activity calibrators and the NIST Vinten 671 ionization chamber to evaluate the suitability of using 133Ba a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918657

3. Comparison of C-14 liquid scintillation counting at NIST and NRC Canada
Published: 3/1/2016
Authors: Denis E Bergeron, Raphael Galea, Lizbeth Laureano-Perez, Brian Edward Zimmerman
Abstract: An informal bilateral comparison of 14C liquid scintillation (LS) counting at the National Research Council of Canada (NRC) and the National Institute of Standards and Technology (NIST) has been completed. Two solutions, one containing 14C-labeled so ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918474

4. Long-term stability of carrier-added Ge-68 standardized solutions
Published: 3/1/2016
Authors: Brian Edward Zimmerman, Denis E Bergeron, Ryan P Fitzgerald, Jeffrey T Cessna
Abstract: Tests for chemical stability were carried out on carrier-added 68Ge solutions prepared and calibrated in 2007 and 2011 to evaluate the suitability of the specific composition as a potential Standard Reference Material. Massic count rates of the store ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918733

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918048

6. Revision of the NIST Standard for 223Ra: New Measurements and Review of 2008 Data
Series: Journal of Research (NIST JRES)
Published: 7/1/2015
Authors: Denis E Bergeron, Jeffrey T Cessna, Leticia S Pibida
Abstract: After discovering a discrepancy in the transfer standard currently being disseminated by the National Institute of Standards and Technology (NIST), we have performed a new primary standardization of the alpha-emitter 223Ra using Live-timed Antico ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917481

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917521

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916239

9. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917094

10. 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- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915776



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