Accepted manuscripts
Radiation Attenuation Properties of La2O3-Modified Bismuth Borate Glass for Gamma Shielding Applications
Oki Ade Putra, and Rin Hafsahtul Asiah
Abstract: The increasing demand for transparent, non-toxic, and environmentally friendly alternatives to conventional gamma radiation shielding materials, such as lead and concrete, has driven the development of glass-based shielding systems. This computational study investigates the radiation shielding performance of bismuth borate-based glass systems modified with varying concentrations of lanthanum oxide (La2O3). The glass samples were formulated with the composition (40–x)B2O3–25Bi2O3–20Na2O–15ZnO–xLa2O3, where x = 0, 3, 6, 9, and 12 mol%. Shielding parameters, including mass attenuation coefficient (MAC), linear attenuation coefficient (LAC), half-value layer (HVL), tenth-value layer (TVL), and mean free path (MFP) were evaluated through theoretical calculations using the XCOM software developed by NIST, which computes photon cross-sections based on the elemental composition of each sample, over the photon energy range of 0.01–15 MeV. The results showed that increasing La2O3 concentration led to a significant improvement in shielding effectiveness, marked by higher MAC and LAC values, and lower HVL, TVL, and MFP values—especially at low to intermediate photon energies. At 0.662 MeV, The sample with the highest La2O3 content (x = 12 mol%) showed an MFP value of 1.903 cm, significantly lower than RS-253-G18 (4.800 cm) and synthetic borax glass (5.500 cm). This represents a 60.35% and 65.4% reduction in MFP, respectively. Therefore, the x = 12 mol% sample demonstrated enhanced attenuation performance relative to the benchmark materials. These results suggest the potential of La2O3-modified bismuth borate glass as a candidate for future gamma radiation shielding applications, particularly in nuclear medicine, although further experimental validation is required to confirm its effectiveness, transparency, and environmental safety.
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Aloe vera and Silicone Oil Based Coating to Reduce Wettability of Glass
Maya Shofani, Suparno, Heru Kuswanto
Abstract: Aloe vera is the herbal plants that has various uses, one of which is as an edible coating to maintain durability. Silicone oil is also a liquid that is airtight and is commonly used as a coating material in various fields. This research develops a coating material that can reduce wettability on the glass surface. The study was conducted by making 5 samples of liquid A1 - A5 with variations in composition to see which liquid has the best ability to reduce wetness. A good surface has hydrophobic properties, namely being resistant to air. The coating technique on the glass was carried out using the deep coating method until the surface was dry and the contact angle of the glass surface droplets was measured using ImageJ software. The results showed that the media without a coating had hydrophilic properties with an average contact angle of 23.76 while the five variations of liquid were able to reduce wetness on the glass surface with the highest contact angle reaching 83.22 ° and the lowest contact angle of 46.53 °. In all sample A1 to A5 were able to reduce wetness and increase the contact angle more than 2 times.
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