Journal of Thermal Analysis and Calorimetry

, Volume 106, Issue 3, pp 783–786 | Cite as

Evaluation of the effects of gamma radiation on thermal properties of wood species used in Brazilian artistic and cultural heritage

  • Lucio Cesar Severiano
  • Francisco Antonio Rocco Lahr
  • Marcelo Augusto Gonçalves Bardi
  • Luci Diva Brocardo Machado
Article

Abstract

The wood is considered a natural composite of extreme complexity, mainly composed of cellulose, lignin, hemicellulose (polyposis), and extractives. Its composition encourages biological attacks from different species. In this context, several techniques have been studied and applied for disinfecting and decontaminating wood-made works of art and cultural heritage objects, which have been damaged by fungi, bacteria, and insects. Gamma radiation has been studied as an alternative to chemical methodologies for this purpose. By this way, the aim of this article is to illustrate the effect of gamma radiation on some physicochemical properties of Pinnus patula, Pinnus cunninghamia, Cedrella fissillis, and Ocotea porosa wood species. The irradiation has shown itself to be a fast and efficient process to eliminate infestations by both insects and microorganisms and no quarantine is required because of the no generation of toxic residues. On the other hand, this process does not protect the irradiated material from re-infestations or re-contamination. In this study, relatively high gamma radiation doses were applied up to 100 kGy so that radiation effects, which are cumulative, could be retrieved by means of thermal properties. The results have shown that gamma radiation, in the studied dose range, does not promote meaningful alterations on the evaluated properties, which allows that artifacts be irradiated multiple times, even if a re-infestation occurs.

Keywords

Gamma radiation Wood Thermal properties Cultural heritage 

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • Lucio Cesar Severiano
    • 1
  • Francisco Antonio Rocco Lahr
    • 2
  • Marcelo Augusto Gonçalves Bardi
    • 1
  • Luci Diva Brocardo Machado
    • 1
  1. 1.Instituto de Pesquisas Energéticas e Nucleares/Comissão Nacional de Energia Nuclear (IPEN/CNEN-SP), Centro de Tecnologia das RadiaçõesSão PauloBrazil
  2. 2.Laboratório de Madeiras e Estruturas de MadeirasUniversidade de São Paulo (USP)São CarlosBrazil

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