Growth, spectra and continuous-wave 2.1 μm laser operation of Ho3+-doped bismuth silicate crystal

Single crystals of Ho3+-doped bismuth silicate (BSO) were grown by the modified Bridgman method. The spectroscopic properties for 2 μm laser transition via the 5I7  5I8 transition were investigated...

Gamma-Ray Protection Properties of Bismuth-Silicate Glasses against Some Diagnostic Nuclear Medicine Radioisotopes: A Comprehensive Study

This study aimed to perform an investigation for the potential implementation of bismuth silicate glasses as novel shield equipment instead of ordinary shields in nuclear medicine facilities. Accordingly, a group of Bi2O3 reinforced silicate glass system were investigated and compared with ordinary shields in terms of their gamma-ray attenuation properties in diagnostic nuclear medicine radioisotope energies emitted from 99mTc, 111In, 67Ga, 123I, 131I, 81mKr, 201Tl, 133Xe. Mass attenuation coefficient (μm) results for glass samples were calculated comparatively with the XCOM program and MCNPX code. The gamma-ray attenuation parameters such as half value layer (HVL), tenth value layer (TVL), mean free path (MFP), effective atomic number (Zeff) were obtained in the diagnostic gamma ray energy range from 75 to 336 keV. To confirm the attenuation performance of superior sample, obtained results were extensively compared with ordinary shielding materials. According to the results obtained, BISI6 glass sample with the highest Bi2O3 additive has an excellent gamma-ray protection.

An Effectual Role of Molybdenum Ions on the Semiconducting Temperament of Na2O-PbO-Bi2O3-SiO2 Glasses

Melt quenching method is adopted to synthesize multi-component glasses 10Na2O –30PbO –10Bi2O3 – (50-x)SiO2 – xMoO3 (where x = 0 to 5 mol%). These samples are characterized by XRD as well as analysed by optical absorption, EPR, and FTIR spectroscopic techniques in order to discuss the structure of the glass network. The proportionate change of Mo6+ ions into Mo5+ local states, which depolymerize the glass network, is publicized by optical absorption studies. EPR spectral analysis of the samples revealed C4v symmetry in a square pyramidal with a Mo=O bond. FTIR spectra of doped glasses report the presence of MoO4 and MoO6 structural units. All spectroscopic studies propped up the semi-conducting nature of sodium lead bismuth silicate glasses doped with the higher content of MoO3.