Abstract
Properties of glasses in the system Li2O-PbO-B2O3 have been investigated for the application as radiation shielding material. This system is selected because of large cross section of boron for neutron, high absorption property of lead for gamma ray and favorable property of lithium in respect of secondary gamma ray.The glass formation range determined in this system was fairly wide and twelve samples were prepared in this region. Measurements were made on thermal expansion coefficients, incipient softening points and densities, which gave the values of 6-15×10-6cm/cm°C, 300-500°C and 2-7.5g/cm3 respectively. Differential thermal analysis indicated very strong exothermal peaks owing to crystallization of glasses, which was proved by X-ray diffractions.Radiation shielding characteristics were showed by linear absorption coefficients for gamma ray and macroscopic total cross sections for thermal neutrons (2200m/sec) calculated from known nuclear data, compositions and densities which were determined in the experiment, and were compared with those of commercial X-ray absorbing glass and neutron absorbing glass. As a result, glasses of this system were confirmed to have considerable radiation shielding abilities for gamma ray and neutrons. A defect of glasses in this system is low chemical durability, therefore improvement by addition of the forth component or surface coating is necessary for practical use.
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