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1. 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 ...

2. 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 ...

3. 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 ...

4. Determination of micelle size in some commercial liquid scintillation cocktails
Published: 3/3/2012
Author: Denis E Bergeron
Abstract: We performed dynamic light scattering measurements on commercially available liquid scintillation (LS) cocktails over a range of aqueous and acid contents. In all cases, we measured hydrodynamic diameters substantially smaller than the current de fa ...

5. 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 ...

6. Development of secondary standards for radium-223
Published: 11/5/2009
Authors: Denis E Bergeron, Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: 223Ra is a bone-seeking alpha emitter, and as such is currently being evaluated as a radiopharmaceutical for the treatment of skeletal metastases. In the clinical setting, dosage measurements are typically achieved with reentrant ionization chambers ...

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. Glycosidic Linkage Conformation of Methyl-alpha-Mannopyranoside
Published: 7/31/2008
Authors: Orkid Coskuner, Denis E Bergeron, Luis Cipriano Rincon, Jeffrey W Hudgens, Carlos A Gonzalez
Abstract: We study the preferred conformation of the glycosidic linkage of methyl--mannopyranoside in the gas phase and in aqueous solution. Results obtained utilizing Car Parrinello molecular dynamics (CPMD) simulations are compared to those obtained ...

9. Identification of Active Sites of Biomolecules II: Saccharide and Transition Metal ion in Aqueous Solution
Published: 2/23/2009
Authors: Orkid Coskuner, Denis E Bergeron, Luis Cipriano Rincon, Jeffrey W Hudgens, Carlos A Gonzalez
Abstract: We discuss the coordination mechanism of FeIII and methyl-a-mannopyranoside in aqueous solution using a recently presented integrated approach comprising ab initio electronic structure calculations, molecular dynamics simulations, and mass spectrome ...

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- ...

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