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Determination of self shielding factors and gamma attenuation effects for tree ring samples

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Abstract

Determination of tree ring chemistry using Neutron Activation Analysis (NAA) is part of an ongoing research between Penn State University (PSU) and Cornell University, The Malcolm and Carolyn Wiener Laboratory for Aegean and Near Eastern Dendrochronology. Tree-ring chemistry yields valuable data for environmental event signatures. These signatures are a complex function of elemental concentration. To be certain about concentration of signature elements, it is necessary to perform the measurements and corrections with the lowest error and maximum accuracy possible. Accurate and precise values of energy dependent neutron flux at dry irradiation tubes and detector efficiency for tree ring sample are calculated for Penn State Breazeale Reactor (PSBR). For the calculation of energy dependent and self shielding corrected neutron flux, detailed model of the TRIGA Mark III reactor at PSU with updated fuel compositions was prepared using the MCNP utility for reactor evolution (MURE) libraries. Dry irradiation tube, sample holder and sample were also included in the model. The thermal flux self-shielding correction factors due to the sample holder and sample for were calculated and verified with previously published values. The Geant-4 model of the gamma spectroscopy system, developed at Radiation Science and Engineering Center (RSEC), was improved and absolute detector efficiency for tree-ring samples was calculated.

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References

  1. Ünlü K, Kuniholm PI, Chiment JJ, Hauck DK (2005) Neutron activation analysis of absolutely-dated tree rings. J Radioanal Nucl Chem 264(1):21–27

    Article  Google Scholar 

  2. Borovicka J et al (2010) Bioaccumulation of gold in macrofungi and ectomycorrhizae from the vicinity of the Mokrsko gold deposit, Czech Republic. Soil Biol Biochem 42(1):83–91

    Article  CAS  Google Scholar 

  3. Sardans J, Peñuelas J (2005) Trace element accumulation in the moss Hypnum cupressiforme Hedw. and the trees Quercus ilex L. and Pinus halepensis Mill. in Catalonia. Chemosphere 60(9):1293–1307

    Article  CAS  Google Scholar 

  4. Mueck K, Bensch F (1973) Cadmium correction factors of several thermal neutron foil detectors. J Nucl Energy 27(9):677–688

    Article  CAS  Google Scholar 

  5. Chilian C, St-Pierre J, Kennedy G (2008) Complete thermal and epithermal neutron self-shielding corrections for NAA using a spreadsheet. J Radioanal Nucl Chem 278(3):745–749

    Article  CAS  Google Scholar 

  6. Degenaar IH, Blaauw M, de Goeij JJM (2003) Correction for neutron self-shielding in large-sample prompt-gamma neutron activation analysis. J Radioanal Nucl Chem 257(3):467–470

    Article  CAS  Google Scholar 

  7. Chilian C, St-Pierre J, Kennedy G (2006) Dependence of thermal and epithermal neutron self-shielding on sample size and irradiation site. Nucl Instrum Methods Phys Res A 564(2):629–635

    Article  CAS  Google Scholar 

  8. Tzika F, Stamatelatos IE (2004) Thermal neutron self-shielding correction factors for large sample instrumental neutron activation analysis using the MCNP code. Nucl Instrum Methods Phys Res B 213:177–181

    Article  CAS  Google Scholar 

  9. Martinho E, Salgado J, Gonçalves IF (2004) Universal curve of the thermal neutron self-shielding factor in foils, wires, spheres and cylinders. J Radioanal Nucl Chem 261(3):637–643

    Article  CAS  Google Scholar 

  10. Martinho E, Gonçalves IF, Salgado J (2003) Universal curve of epithermal neutron resonance self-shielding factors in foils, wires and spheres. Appl Radiat Isot 58(3):371–375

    Article  CAS  Google Scholar 

  11. Trkov A, Zerovnik G, Snoj L, Ravnik M (2009) On the self-shielding factors in neutron activation analysis. Nucl Instrum Methods Phys Res A 610(2):553–565

    Article  CAS  Google Scholar 

  12. Gwozdz R, Grass F (2006) Standardization problems in INAA of large organic samples. Czechoslov J Phys 56(1):D229–D240

    Article  CAS  Google Scholar 

  13. Meplan O, Nuttin A, Laulan O, David S, Michel-Sendis F, Wilson J (2005) MURE: MCNP utility for reactor evolution—description of the methods, first applications and results. ENS-ANS-SFEN, Versailles

  14. Meplan O (2011) User guide, MURE, MCNP utility for reactor evolution. http://lpsc.in2p3.fr/gpr/MURE/html/UserGuide/UserGuide.html. Accessed 10 February 2011

  15. Booth TE, Brown FB, Bull JS et al (2008) MCNP5 1.50 release notes, LA-UR-08-2300

  16. CCC-0740 MCNP5/MCNPX (2011) MCNP5/MCNPX, Monte Carlo N-particle transport code system including MCNP5 1.50, MCNPX 2.6.0, VISED and data libraries. http://www.oecd-nea.org/tools/abstract/detail/ccc-0740. Accessed 10 February 2011

  17. Bateman H (1910) Solution of a system of differential equations occurring in the theory of radioactive transformations. Cambridge 15:423–427

    CAS  Google Scholar 

  18. Chao J (1980) COBRA-3C/RERTR—a thermal-hydraulic subchannel code with low pressure capabilities. Science Applications, Inc.

  19. Reiss T, Fehér S, Czifrus S (2008) Coupled neutronics and thermohydraulics calculations with burn-up for HPLWRs. Prog Nucl Energy 50(1):52–61

    Article  CAS  Google Scholar 

  20. Wilson J et al (2009) Economy of uranium resources in a three-component reactor fleet with mixed thorium/uranium fuel cycles. Ann Nucl Energy 36(3):404–408

    Article  CAS  Google Scholar 

  21. Şahin D, Ünlü K (2009) Modeling a gamma spectroscopy system and predicting spectra with Geant-4. J Radioanal Nucl Chem 282(1):167–172

    Article  Google Scholar 

  22. Agostinelli S et al (2003) G4—a simulation toolkit. Nucl Instrum Methods in Phys Res A 506(3):250–303

    Article  CAS  Google Scholar 

  23. Hurtado S, García-León M, García-Tenorio R (2004) GEANT4 code for simulation of a germanium gamma-ray detector and its application to efficiency calibration. Nucl Instrum Methods in Phys Res A 518(3):764–774

    Article  CAS  Google Scholar 

  24. CERN (2007) Geant4 collaboration physics reference manual. Online source, http://geant4.cern.ch/support/userdocuments.shtml. Accessed 10 January 2011

  25. Penn State Breazeale Reactor (2005) PSBR safety analysis report. RSEC Breazeale Nuclear Reactor, Penn State University

  26. Tippayakul, Ivanov, Sears (2006) TRIGSIMS FUEL MANAGEMENT PROGRAM MANUAL FOR PSBR Version 1.0., The Penn State University, University Park

  27. Tippayakul C, Ivanov K, Frederick Sears C (2008) Development of a practical Monte Carlo based fuel management system for the Penn State University Breazeale research reactor (PSBR). Ann Nucl Energy 35(3):539–551

    Article  CAS  Google Scholar 

  28. Epstein E, Bloom AJ (2004) Mineral nutrition of plants: principles and perspectives, 2nd edn. Sinauer Associates, Sunderland

    Google Scholar 

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Acknowledgments

Special thanks to Mark A. Trump and Brenden Heidrich for their countless discussions and help to evaluate measured data for reactor experiments. This project was sponsored by The Pennsylvania State University, Radiation Science and Engineering Center.

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  1. The Pennsylvania State University, Radiation Science and Engineering Center, University Park, PA, 16802, USA

    Dağıstan Şahin & Kenan Ünlü

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  1. Dağıstan Şahin
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  2. Kenan Ünlü
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Correspondence to Dağıstan Şahin.

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Şahin, D., Ünlü, K. Determination of self shielding factors and gamma attenuation effects for tree ring samples. J Radioanal Nucl Chem 291, 549–553 (2012). https://doi.org/10.1007/s10967-011-1281-x

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  • DOI: https://doi.org/10.1007/s10967-011-1281-x

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