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The mass attenuation coefficients (μ/ρ) for dif-ferent parts (root, flower, stem, and leaf) of three medicinal aromatic plants (Teucrium chamaedrys L. subsp. sinuatum, Rheum ribes, and Chrysophthalmum montanum) were measured using an 241Am photon source in a stable geom-etry and calculated using the Monte Carlo N-Particle Transport Code System-extended (MCNPX) code and the WinXCOM program. The experimental and theoretical MCNPX and WinXCOM values exhibited good agreement. The measured mass attenuation coefficient values were then used to compute the effective atomic number (Zeff) and electron density (NE) of the samples. The results reveal that S1-S (stem of Teucrium chamaedrys L. subsp. sinua-tum) has the highest values ofμ/ρand Zeff.