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Author: ryan fitzgerald
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1. A Liquid-Scintillation-based Primary Standardization of 210Pb
Published: 12/1/2007
Authors: L Laureano-p{eacute}rez, R Coll{eacute}, Ryan P Fitzgerald, Iisa Outola, Leticia S Pibida
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100977

2. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914677

3. 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

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915421

5. An Automated Ionization Chamber for Secondary Radioactivity Standards
Published: 12/8/2009
Author: Ryan P Fitzgerald
Abstract: We report on the operation and characterization of a new ionization chamber system, called AUTOIC, featuring a commerical digital electrometer and a commerical robotic sample changer. The ralative accuracy of the electrometer was improved significan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903476

6. Charged-Particle Thermonuclear Reaction Rate Evaluation for A=12-40 Nuclei: I. Monte Carlo Method and Statistical Distributions
Published: 4/28/2010
Authors: Ryan P Fitzgerald, R Longland, C. Iliadis, E. Champagne, J.R. Newton, C. Ugalde
Abstract: A new method based on Monte Carlo techniques is presented for evaluating thermonuclear reaction rates. We begin by reviewing commonly applied procedures and point out that reaction rates that have been reported up to now in the literature have no rig ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842419

7. Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions.
Published: 4/9/2010
Authors: C. Iliadis, R Longland, A E Champagne, A. Coc, Ryan P Fitzgerald
Abstract: Numerical values of charged-particle thermonuclear reaction rates for nuclei in the A=14-40 region are tabulated. The results are obtained using a method, based on Monte Carlo techniques, that has been described in the preceding paper of this series ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904290

8. Development of a Compton Suppression Technique based on a Neural Network-
Published: 1/1/2005
Authors: Ryan P Fitzgerald, A E Champagne
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103125

9. Half-life Measurements of Sr82
Published: 1/30/2009
Authors: Leticia S Pibida, Ryan P Fitzgerald, Michael P Unterweger, Michelle M. Hammond, Daniel B. Golas
Abstract: Half-life measurements of 82Sr were performed at the National Institute of Standards and Technology (NIST) using gamma-ray spectrometry and a 4 pressurized ionization chamber. The 82Sr half-life was determined to be 25.36 &plu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842553

10. 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



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