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1. The effect of impurities on calculated activity in the triple-to-double coincidence ratio liquid scintillation method
Published: 3/4/2012
Authors: Denis E Bergeron, Ryan P Fitzgerald, Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: In the triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting, unaccounted or improperly accounted impurities can result in lower-than-expected or higher-than-expected recovered activities, depending on the counting efficie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909218

2. Investigation into the Standardization of Tc-99
Published: 7/30/2010
Authors: Lizbeth Laureano-Perez, Ronald Colle, Ryan P Fitzgerald, Brian Edward Zimmerman, Lonnie Talmadge Cumberland
Abstract: The standardization of 99Tc by several primary methods was investigated. This was performed to support a new 99Tc transfer standard that has been developed and will be disseminated by the National Institute of Standards and Technology (NIST) as Stan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902971

3. Development of a traceable calibration methodology for solid Ge-68/Ga-68 sources used as a calibration surrogate for F-18 in radionuclide activity calibrations
Published: 3/31/2010
Authors: Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: We have developed a methodology for calibrating 68Ge radioactivity content in a commercially-available calibration source for dose calibrators in a way that is traceable to the national standard. Additionally, the source was cross-calibrated for equi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902879

4. A New Primary Standardization of Th-229
Published: 1/7/2010
Authors: Ryan P Fitzgerald, Lizbeth Laureano-Perez, Michelle M. Hammond, Leticia S Pibida, Svetlana Nour, Brian Edward Zimmerman
Abstract: The National Institute of Standards and Technology (NIST) has certified a high-purity Th-229 Standard Reference Material as SRM 4328C, based on live-timed 4-pi alpha,beta-gamma anticoincidence counting (LTAC) of the equilibrium solution. The LTAC sy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903482

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903048

6. Standardization of 68Ge/68Ga using three liquid scintillation counting-based methods
Series: Journal of Research (NIST JRES)
Published: 10/31/2008
Authors: Brian Edward Zimmerman, Jeffrey T Cessna, Ryan P Fitzgerald
Abstract: A solution containing 68Ge in equilibrium with its daughter, 68Ga, has been standardized for the first time at the National Institute of Standards and Technology using 3 liquid scintillation- based techniques: live-timed 4pb-g anticoincidence (LTAC) ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842499

7. 63Ni, its Half-life and Standardization: Revisited
Published: 1/1/2007
Authors: R Coll{eacute}, Brian Edward Zimmerman, P Cassette, L Laureano-p{eacute}rez
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100905

8. Assessing the 210At Impurity in the Production of ^u211^At for Radiotherapy by ^u210^At Analysis via Isotope Dilution Alpha Spectrometry
Published: 1/1/2006
Authors: M K Schultz, Michelle M. Hammond, Jeffrey T Cessna, P Plascjak, Brian Edward Zimmerman, B Norman, L Szajek, K Garmestani, Michael P Unterweger
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103325

9. Comparison of Calculated Spectra for the Interaction of Photons in a Liquid Scintillator. Example of 54Mn 835 keV Emission
Published: 1/1/2006
Authors: P Cassette, G H Ahn, T Aubineau-Lanie Alzitzoglou, F Bochud, E Garcia torano, A Grau carles, A Grau malonda, K Kossert, K B Lee, J P Laedermann, B R Simpson, W M Van wyngaardt, Brian Edward Zimmerman
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103016

10. International Guidance on the Establishment of Quality Assurance Programmes for Radioactivity Measurement in Nuclear Medicine
Published: 1/1/2006
Authors: Brian Edward Zimmerman, C Herbst, J P Norenberg, M J Woods
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103408