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Radiochemical Sciences and Engineering

Matthew O'Hara

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352

Selected Publications

2009

  • O'Hara MJ, SR Burge, and JW Grate. 2009. "Automated radioanalytical system for the determination of Sr-90 in environmental water samples by Y-90 Cherenkov radiation counting." Analytical Chemistry 81(3):1228-1237. 
  • O'Hara MJ, SR Burge, and JW Grate. 2009. "Quantification of Technetium-99 in Complex Groundwater Matrixes using a Radiometric Preconcentrating Minicolumn Sensor in an Equilibration-based Sensing Approach." Analytical Chemistry 81(3):1068-1078. 
  • Devol TA, JP Clements, AF Farawila, MJ O'Hara, O Egorov, and JW Grate. 2009. "Characterization and Application of Superlig 620 Solid Phase Extraction Resin for Automated Process Monitoring of 90Sr." Journal of Radioanalytical and Nuclear Chemistry 282(2):623-628. 

2008

  • O'Hara MJ, PC Durst, JW Grate, O Egorov, and TA Devol. 2008. "RAPID AUTOMATED RADIOCHEMICAL ANALYZER FOR DETERMINATION OF TARGETED RADIONUCLIDES IN NUCLEAR PROCESS STREAMS." In Proceedings of the 8th International Conference on Facility Operations-Safeguards Interface, March 30-April 4, 2008, Portland, Oregon, p. Paper No. 88.  American Nuclear Society, La Grange Park, IL. 
  • O'Hara MJ, PC Durst, JW Grate, TA Devol, O Egorov, and JP Clements. 2008. "AUTOMATED PROCESS MONITORING: APPLYING PROVEN AUTOMATION TECHNIQUES TO INTERNATIONAL SAFEGUARDS NEEDS." In Proceedings of the 49th Annual Meeting of the Institue of Nuclear Materials Management , p. Paper No. 351.  Institue of Nuclear Materials Management, Northbrook, IL. 
  • Grate JW, OB Egorov, MJ O'Hara, and TA Devol. 2008. "Radionuclide Sensors for Environmental Monitoring: From Flow Injection Solid-Phase Absorptiometry to Equilibration-Based Preconcentrating Minicolumn Sensors with Radiometric Detection." Chemical Reviews 108(2):543-562.  doi:10.1021/cr068115u
  • Grate JW, RM Ozanich, JS Hartman, MJ O'Hara, and O Egorov. 2008. "Preconcentrating Minicolumn Sensors for Trace Environmental Monitoring." In IEEE Sensors 2007: 6th IEEE Conference on Sensors, pp. 1357-1360.  IEEE , New York, NY.  doi:10.1109/ICSENS.2007.4388663
  • Levitskaia TG, MJ O'Hara, SI Sinkov, and OB Egorov. 2008. "Direct Spectrophotometric Analysis of Cr(VI) Using a Liquid Waveguide Capillary Cell." Applied Spectroscopy 62(1):107-115. 
  • Paxton WF, MJ O'Hara, SM Peper, SL Petersen, and JW Grate. 2008. "Accelerated Analyte Uptake on Single Beads in Microliter-scale Batch Separations using Acoustic Streaming: Plutonium Uptake by Anion Exchange for Analysis by Mass Spectrometry ." Analytical Chemistry 80(11):4070-4077.  doi:10.1021/ac800160n
  • Peper SM, BK McNamara, MJ O'Hara, and M Douglas. 2008. "A Green Approach to SNF Reprocessing: Are Common Household Reagents the Answer?" In Proceedings of the 8th International Conference on Facility Operations-Safeguards Interface, March 30-April 4, 2008, Portland, Oregon, p. Paper No. 84.  American Nuclear Society, La Grange Park, IL. 
  • Serne RJ, BN Bjornstad, DC Lanigan, GW Gee, CW Lindenmeier, RE Clayton, VL Legore, MJ O'Hara, CF Brown, GV Last, IV Kutnyakov, DS Burke, TC Wilson, and BA Williams. 2008. Characterization of Vadose Zone Sediment: Borehole 299-W23-19 [SX-115] in the S-SX Waste Management Area. PNNL-13757-2 Rev. 1, Pacific Northwest National Laboratory, Richland, WA. 
  • Serne RJ, BN Bjornstad, HT Schaef, BA Williams, DC Lanigan, DG Horton, RE Clayton, AV Mitroshkov, VL Legore, MJ O'Hara, CF Brown, KE Parker, IV Kutnyakov, JN Serne, GV Last, SC Smith, CW Lindenmeier, JM Zachara, and DS Burke. 2008. Characterization of Vadose Zone Sediment: Uncontaminated RCRA Borehole Core Samples and Composite Samples. PNNL-13757-1 Rev. 1, Pacific Northwest National Laboratory, Richland, WA. 
  • Serne RJ, GV Last, HT Schaef, DC Lanigan, CW Lindenmeier, CC Ainsworth, RE Clayton, VL Legore, MJ O'Hara, CF Brown, RD Orr, IV Kutnyakov, TC Wilson, KB Wagnon, BA Williams, and DS Burke. 2008. Characterization of Vadose Zone Sediment: Borehole 41-09-39 in the S-SX Waste Management Area . PNNL-13757-3 Rev. 1, Pacific Northwest National Laboratory, Richland, WA. 
  • Serne RJ, GV Last, HT Schaef, DC Lanigan, CW Lindenmeier, CC Ainsworth, RE Clayton, VL Legore, MJ O'Hara, CF Brown, RD Orr, IV Kutnyakov, TC Wilson, KB Wagnon, BA Williams, and DS Burke. 2008. Characterization of Vadose Zone Sediment: Slant Borehole SX-108 in the S-SX Waste Management Area . PNNL 13757-4 Rev. 1, Pacific Northwest National Laboratory, Richland, WA. 

2006

  • Egorov OB, MJ O'Hara, and JW Grate. 2006. "Equilibration-Based Preconcentrating Minicolumn Sensors for Trace Level Monitoring of Radionuclides and Metal Ions in Water without Consumable Reagents." Analytical Chemistry 78(15):5480-5490. 

2005

  • Addleman RS, MJ O'Hara, JW Grate, and OB Egorov. 2005. "Chemically Enhanced Alpha-Energy Spectroscopy in Liquids." Journal of Radioanalytical and Nuclear Chemistry 263(2):291-294. 
  • Addleman RS, MJ O'Hara, TD Marks, JW Grate, and OB Egorov. 2005. "Direct Actinide Assay with Surface Passivated Silicon Diodes." Journal of Radioanalytical and Nuclear Chemistry 263(2):295-300. 
  • Addleman RS, OB Egorov, MJ O'Hara, BJ Busche, TS Zemanian, and GE Fryxell. 2005. "Preconcentration and Assay of Radionuclides with Self Assembled Monolayers on Mesoporous Supports ." Journal of Radioanalytical and Nuclear Chemistry 263(1):59-64. 
  • Egorov OB, MJ O'Hara, and JW Grate. 2005. "Automated Radiochemical Analysis of Total 99TC in Aged Nuclear Waste Processing Streams." Journal of Radioanalytical and Nuclear Chemistry 263(3):629-633. 
  • Egorov OB, MJ O'Hara, JW Grate, MA Knopf, G Anderson, and JS Hartman. 2005. "Radiochemical Sensor System for the Analysis of Tc-99 (VII) in Groundwater ." Journal of Radioanalytical and Nuclear Chemistry 264(2):495-500. 
  • Egorov OB, RS Addleman, MJ O'Hara, TD Marks, and JW Grate. 2005. "Direct Measurement of Alpha Emitters in Liquids using Passivated Ion Implanted Planar Silicon (PIPS) Diode Detectors." Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment 537(3):600-609. 
  • Grate JW, OB Egorov, and MJ O'Hara. 2005. "Sensors and Automated Analyzers for Radionuclides." Chapter 14 in Subsurface Contamination Remediation: Accomplishments of the Environmental Management Science Program Symposium, ACS Symposium Series, vol. 904, ed. Edgar Berkey and Tiffany Zachry, pp. 322-341.  American Chemical Society, Washington, DC. 

2004

  • Egorov OB, MJ O'Hara, and JW Grate. 2004. "Microwave-Assisted Sample Treatment in a Fully Automated Flow-Based Instrument: Oxidation of Reduced Technetium Species in the Analysis of Total Technetium-99 in Caustic Aged Nuclear Waste Samples." Analytical Chemistry 76(14):3869-3877. 

2003

  • Egorov OB, MJ O'Hara, RS Addleman, and JW Grate. 2003. "Automation of Radiochemical Analysis: From Groundwater Monitoring to Nuclear Waste Analysis." In ACS Symposium Series: Radioanalytical Methods in Interdisciplinary Research. , vol. 868, ed. Carola A. Laue and Kenneth L. Nash, pp. 246-270.  American Chemical Society, Washington D.C.. 

2002

  • Egorov OB, MJ O'Hara, and JW Grate. 2002. "Radionuclide Selective Sensors for Water Monitoring: 99Tc(VII) Detection in Hanford Groundwater." In Spectrum 2002: Exploring Science-Based Solutions and Technologies, 9th Bienniel International Conference on Nuclear and Hazardous Waste Management , vol. (CD-ROM), American Nuclear Society, La Grange, IL. 
  • Icenhower JP, BP McGrail, DM Strachan, RD Scheele, VL Legore, EA Cordova, JL Steele, CF Brown, and MJ O'Hara. 2002. "Experimental Determination of the Dissolution Kinetics of Plutonium- and Uranium-Bearing Ceramics at 90 degrees C." In Scientific Basis for Nuclear Waste Management XXV, Materials Research Society Symposium Proceedings, vol. 713, ed. B.P. McGrail and G.A. Cragnolino, pp. 433-440 paper no. JJ11.38.  Materials Research Society, Warrendale, PA. 
  • Icenhower JP, BP McGrail, WJ Weber, BD Begg, NJ Hess, EA Cordova, JL Steele, CF Brown, and MJ O'Hara. 2002. "Dissolution of A2Ti2O7 (A = Y3?, Gd3?, or Lu3?) Pyrochlore by Experiment at pH = 2, T = 90 C: Evidence for Solubility Control Using a Linear Free Energy Model." In Scientific Basis for Nuclear Waste Management XXV, Materials Research Society Symposium Proceedings, vol. 713, ed. BP McGrail and GA Cragnolino, pp. 397-403 paper no. JJ6.2.  Materials Research Society, Warrendale, PA. 
  • Serne RJ, BN Bjornstad, HT Schaef, BA Williams, DC Lanigan, DG Horton, RE Clayton, AV Mitroshkov, VL Legore, MJ O'Hara, CF Brown, KE Parker, IV Kutnyakov, JN Serne, GV Last, SC Smith, CW Lindenmeier, JM Zachara, and DS Burke. 2002. Characterization of Vadose Zone Sediment: Uncontaminated RCRA Borehole Core Samples and Composite Samples. PNNL-13757-1, Pacific Northwest National Laboratory, Richland, WA. 
  • Serne RJ, GV Last, HT Schaef, DC Lanigan, CW Lindenmeier, CC Ainsworth, RE Clayton, VL Legore, MJ O'Hara, CF Brown, RD Orr, IV Kutnyakov, TC Wilson, KB Wagnon, BA Williams, and DS Burke. 2002. Characterization of Vadose Zone Sediment: Borehole 41-09-39 in the S-SX Waste Management Area. PNNL-13757-3, Pacific Northwest National Laboratory, Richland, WA. 
  • Serne RJ, GV Last, HT Schaef, DC Lanigan, CW Lindenmeier, CC Ainsworth, RE Clayton, VL Legore, MJ O'Hara, CF Brown, RD Orr, IV Kutnyakov, TC Wilson, KB Wagnon, BA Williams, and DS Burke. 2002. Characterization of Vadose Zone Sediment: Slant Borehole SX-108 in the S-SX Waste Management Area. PNNL-13757-4, Pacific Northwest National Laboratory, Richland, WA. 
  • Serne RJ, HT Schaef, BN Bjornstad, DC Lanigan, GW Gee, CW Lindenmeier, RE Clayton, VL Legore, RD Orr, MJ O'Hara, CF Brown, GV Last, IV Kutnyakov, DS Burke, TC Wilson, and BA Williams. 2002. Characterization of Vadose Zone Sediment: Borehole 299-W23-19 [SX -115] in the S-SX Waste Management Area. . PNNL-13757-2, Pacific Northwest National Laboratory, Richland, WA. 
  • Strachan DM, RD Scheele, AE Kozelisky, RL Sell, HT Schaef, MJ O'Hara, CF Brown, and WC Buchmiller. 2002. "Radiation Damage in Titanate Ceramics Used for Plutonium Immobilization." In Scientific Basis for Nuclear Waste Management XXV, vol. 713, pp. 461-468.  Materials Research Society, Warrendale, PA. 

2001

  • Egorov OB, MJ O'Hara, OT Farmer, III, and JW Grate. 2001. "Extraction Chromatographic Separations and Analysis of Actinides Using Sequential Injection Techniques with On-line Inductively Coupled Plasma Mass Spectrometry (ICP MS) Detection." Analyst 126(9):1594-1601. 
  • McGrail BP, JP Icenhower, PF Martin, HT Schaef, MJ O'Hara, E Rodriguez, and JL Steele. 2001. Waste Form Release Data Package for the 2001 Immobilized Low-Activity Waste Performance Assessment. PNNL-13043 Rev.2, Pacific Northwest National Laboratory, Richland, WA. 
  • Strachan DM, RD Scheele, JP Icenhower, AE Kozelisky, RL Sell, VL Legore, HT Schaef, MJ O'Hara, CF Brown, and WC Buchmiller. 2001. The Status of Radiation Damage Experiments. PNNL-13721, Pacific Northwest National Laboratory, Richland, WA. 

1999

  • Egorov OB, MJ O'Hara, JW Grate, and J Ruzicka. 1999. "Sequential Injection Renewable Separation Column Instrument for Automated Sorbent Extraction Separations of Radionuclides." Analytical Chemistry 71(2):345-352. 
  • Egorov OB, SK Fiskum, MJ O'Hara, and JW Grate. 1999. "Radionuclide Sensors based on Chemically Selective Scintillating Microspheres: Renewable Column Sensor for Analysis of 99Tc in Water ." Analytical Chemistry 71(23):5420-5429. 

Radiochemical Sciences and Engineering

Additional Information

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Larry Greenwood
Chief Analysis Scientist/Business Development

Clark Carlson
Chief Scientist

Mike Stephenson
RPL R&D Operations Manager