(Sunday, 7/12/2020) [Eastern Time (GMT-4)]
Room: AAPM ePoster Library
Purpose: Lead is a unique element in terms of attenuation for radiology X-ray. Unfortunately, it is so heavy that could not be for the long term as an individual wearable protective garment and is extremely toxic. Therefore, to find an appropriate alternative for lead has been studied by many researchers using other elements and compounds. The present research investigates, for the first time, the protective effects of cerium oxide nanoparticles (nanoceria) embedded in polydimethylsiloxane (PDMS).
Methods: Nanoceria based-polydimethylsiloxane (PDMS) was prepared by adopting its making procedure. The nanocomposites were exposed by a diagnostic X-ray apparatus at the radiology department of the Urmia Imam Khomeini Hospital. To measure X-Ray attenuation, beam intensity was measured by the nanocomposites and without it with a dosimeter "Piranha red" at narrow beam geometry. Afterward, the results were compared with pure lead characteristics. The measurement procedures were well described through the reliable standard.
Results: The Field Emission Scanning Electron Microscope (FE-SEM) image of the fabricated nanocomposites showed excellent dispersion of the nanoparticle. Surprisingly good, there was no agglomeration of nanoparticles even as increase concentration it. The maximum attenuation (76.66 %) at 60 kVp was achieved for a concentration of 35% of nanoceria. Overall, the nanocomposite weight of the lead equivalent was more than pure lead.
Conclusion: The investigation of attenuation has shown that cerium oxide nanocomposite, considering the weight factor, cannot alone have attenuated as lead equivalent. However, PDMS-based Nanocomposite had flexibility, high Shear modulus, non-toxic and economical.
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