Multilayer Shields' Buildup Factor for Gamma Ray Exposure

Abstract

   Iron discs were coated on both sides with distinct layers of W, Bi, and Pb powders. Three multilayer samples (coated Fe plates with W), (coated Fe plates with Bi), and (coated Fe plates with Pb) were produced by stacking ten powder-coated Fe discs on top of one another and sealing them with epoxy. The average particle sizes for W, Bi, and Pb were found to be 35, 40, and 30 nm, respectively, based on the images obtained using the scanning electron microscopy (SEM) test. Using a gamma spectrometry system with a NaI (Tl) detector, the transmission factor (T %), radiation protection efficiency (RPE), and built-up factor (B) have been calculated for four distinct gamma energies. For every sample, T% increased as energy increased, and the powder utilized will determine how comparable the data are.   The RPE% was 20% for lead-coated iron samples at 1332 MeV, the highest of all the samples. At lower energies, the RPE% for most samples was greater than 70%, and as energy increased, it steadily declined. According to the results, the gamma-ray buildup factor and gamma energy have an inverse relationship.