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%change in µ values at photon energies of (a) 0.1 MeV, (b) 0.5 MeV, (c) 1 MeV, and (d) 5 MeV after addition of 40-phr Bi2O3, Bi2S3, or Pb into Bi2O3/NR, Bi2S3/NR, Pb/NR, Bi2O3/wood/NR, Bi2S3/wood/NR, and Pb/wood/NR composites. Horizontal dotted lines represent the threshold set in this work to determine recommended filler contents (%change < 5%).
