The release or emission of resins from pressed particleboards, modified through gamma radiation, was characterized in terms of the thermal decomposition (TGA) and structure morphology (SEM). Particleboards, based on some farm residues and some polymers as adhesives, were first made by thermal compression in a hot press at 120 degreesC and subsequently exposed to various doses of gamma irradiation. In general, gamma irradiation improves the thermal stability of the particleboards regardless of the type of the farm residues or the type of adhesive. Meanwhile, the thermal stability was found to increase with increasing irradiation dose as shown by the percentage loss in weight at different decomposition temperatures and the temperatures of the maximum values of the rate of reaction. The results showed that the particleboards based on cotton or flax stalks and polystyrene (PS) displayed higher thermal stability than did those based on the epoxy resin (E150). The particleboards based on wood sawdust and the E150 resin showed higher thermal stability than did those based on PS. SEM observations of the fracture surfaces of the different particleboards give further support to the improvement in the thermal properties after exposure to gamma radiation. In this regard, the pores and distances between the base material were coated with radiation-crosslinked or -grafted E150 resin, particularly in the case of wood sawdust boards.