We present a nano‐W dispersed polymer composite whose gamma attenuation is greatly enhanced. In situ pulverization and simultaneous encapsulation of polyethylene (PE) onto the nano‐W particles was successfully performed by ball milling. Adhesive encapsulation of PE was observed by means of interstitial diffusion of atomic W at the boundary using transmission electron microscope. Prepared nano‐W/PE particles were dispersed into ethylene‐propylene‐based polymer mixture using melt mixing. Attenuation of gammas for the nano‐W composites was enhanced up to ∼75% for Ba‐133 (∼0.3 MeV) compared to the micro‐W composites, while it decreases as the photon energy increases. MCNP simulation also shows similar gamma attenuation behaviors.
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Kim et al. (2014) studied this question.
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