Ali, Atif Mossad; Sayyed, M.I.; Rashad, M.; Kumar, Ashok; Kaur, Ramandeep; Aşkın, A.; Algarni, H.

In this work, five glasses for radiation shielding applications in the composition of (30 + x) PbO–5 MoO3–(25 − x) Li2O–40 B2O3 (where x = 0, 5, 10, 15 and 20 mol%) have been prepared. The density increases from 4.354 to 6.578 g cm−3 and the molar volume decreases from 25.144 to 22.520 cm3 with the replacement of Li2O by PbO. The indirect and direct band gap energies decrease from (2.2870–2.2297) eV and (2.9619–2.8660) eV, respectively, as lead content increases from 30 to 50 mol%. In addition, the refractive index of the samples lies between 2.6214 and 2.6429. Geant4 simulation code has been used to evaluate the gamma photon transmission through the prepared samples. Pb50Li5 sample has lower transmission fraction among the studied glasses. For the 2-cm glass thickness, the transmission fraction of Pb30Li25 sample was found to be 0.433 while at the same thickness the transmission fraction of Pb50Li5 sample is 0.265. At 1173 keV, the HVL values were found to be 1.752 cm for Pb50Li5 and 2.693 cm for Pb30Li25 glasses. At the same photon energy, the MFP values were calculated to be 2.529 cm and 3.886 cm for the Pb50Li5 and Pb30Li25 samples, respectively. Due to the higher Pb content existing in the Pb50Li5 glass, this glass effectively blocks the gamma rays compared to the other samples.

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Kumar, Ashok; Ali, Atif Mossad; Sayyed, M.I.; Aşkın, A.; Rashad, M.; Algarni, H.

Amorphous PbO–MgO–Na2O–Fe2O3–BaO–B2O3 glass system has been prepared. FTIR spectra studied in the range of 400–1600 cm−1 which gives information regarding the different structural, vibration bonds. To study the various optical parameters, the UV absorption spectra are studied in the range 190–1100 nm. The photon attenuation characteristics for the current samples were studied using Geant4 simulation code. The transmission fraction (T) was calculated and the results showed that the addition of PbO decreases the values of T. For the samples which contain 55 mol% and 35 mol% of PbO, the T values are, respectively, 0.065 and 0.161 at 356 keV. High atomic number and high of lead result in lower half-value layer values for Pb55B10 glass compared to the Pb35B30 sample which has the lowest amount of Pb in its structure. At 356 keV, the tenth value layer values are 2.521 and 1.685 cm for the samples coded as Pb35B30 and Pb55B10, respectively. From the radiation-shielding parameter results, the use of high-density glasses against the penetrating gamma rays provides a better shielding performance using thinner glass layer.

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