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Photon absorption parameters such as mass attenuation coefficients (μm), molar extinction coefficients (ε), total molecular (σt,m), atomic (σt,a) and electronic (σt,el) cross sections, half-value layers (X1/2), tenth-value layers (X1/10), mean free paths ekT, effective atomic numbers (Zeff), and effective electron densities (Nel) were estimated for defatted soy flour (DSF), soy protein concentrate (SPC), and soy protein isolate (SPI)-based Rhizophora spp. parti-cleboard composites substituted with 10 wt％ sodium hydroxide (NaOH) and 0, 5, 10, and 15 wt％itaconic acid polyamidoamine-epichlorohydrin (IA-PAE) adhesives. Elemental composition was assessed using ultrahigh-reso-lution field emission scanning electron microscopy-energy dispersive X-ray spectrometry (UHR-FESEM-EDX). The interaction parameters were evaluated for Kα1 photons at 16.59, 17.46, 21.21, and 25.26 keV, employing a low-en-ergy germanium (LEGe) detector system and an 241Am γ-ray source. X-ray diffraction characterization revealed an amorphous phase in the developed particleboard compos-ites. Samples DSF15′, SPC15′, and SPI15′ exhibited the highest values of μm, ε, σt,m, Zeff, and Nel among all of the studied particleboard samples, within the range of mea-sured photon energies. In addition, all of the modified samples exhibited lower X1/2, X1/10, λ,σt,a, and σt,el than the unmodified samples, with DSF-, SPC-, and SPI/NaOH/Rhizophora spp./IA-PAE (15 wt％), indicating insignificant changes. The current results of the particleboard samples' analysis can be useful for medical radiation applications and shielding research.