Treatment of Ancient Wood by using Radiation Technology of Polymers

The aim of the study is repairing some partially damaged archeological wood and restoration it before being completely damaged. For achieving this aim, the radiation technology was used in preparing some polymer blends such as Poly (vinyl alcohol) (PVA), Poly ethylene glycol (PEG), acrylic acid (AAC), and Acryl amid (AAm) to improving adhesion forces of polymer with wood and protecting it. The results show that the best mechanical properties was achieved by using Poly(vinyl) alcohol (PVA), acrylic acid (AAC), and acryl amid (AAm). Also, results show that by increasing the ratio of acrylic acid (AAC), the tensile strength, adhesion force, hardness, transparency, are increasing. The best tensile strength obtained was 4.79 MPa for polymer blends contains 18/% acrylic acid, 6% acryl amid, 12% poly (vinyl alcohol) when exposing to Ultra-Violet ray dose of 210 . Results, also showed that the exposing of wood to Ultra-Violet ray dose of 250 [Gry] was enough for doing sterilization, purification.

Radiation Damages in Crystalline Structure

The radiating process of a crystalline sample cause damages in this sample .These damages composed mostly of displaced sample atoms from their regular position in lattice, and placed in irregular position, and of very less quantity from some beam particles ( strange particles ) , that placed inside of this sample. The depth and amount of these damages are correlating with radiating parameters. It's possible to estimate the depth distribution profiles of damages by RBS-Method, but the sensitivity of this method is not enough to determine the depth distribution of concentration of beam particles , that placed inside of the sample . The placement depth of RBS-Profiles top is strongly correlated with orientation angle of a sample's channel relative to radiating beam also to kind of channel ,whereas the RBS-Profiles top displaces in depth , in channel radiation compare with its counter part in random radiation and the displacement value correlates with radiation parameters The height of RBS-Profiles top increase by increasing of radiation dose, and height that can't be survived called amorph state , and the agreeing dose called ,amorph dose , the amorph dose correlates also with radiation parameters, special sample temperature.

The Relationship Between the Cross-Linking Irradiation Doses of Polyethylene and their Mechanical Properties

The use of cross-linking polyethylene was increased, especially for the medium & high voltage electrical cables instead of paper and oil insulating materials. The radiated low density polyethylene is the best technique in the process of cross-linking instead of chemical method. The purpose of this study is to find the relation between mechanical properties of polyethylene samples and the dose rate of irradiation to cross – link the polyethylene materials and to get the best properties. This paper illustrates also the important results, that we have obtained in this study.