New article published in 12(4A) - ENAN / INAC 2024

A 3D Printing Based Anthropomorphic Eye Phantom Development

Abstract: This study aimed to construct a tissue-equivalent anthropomorphic phantom using 3D printing to enable dosimetry with radiochromic films of the optical apparatus in external beam radiotherapy. Slices were developed based on and intended to be used in conjunction with the reference phantom ATOM. 3D printing with polylactic acid (PLA) was utilized to represent soft tissues, while a mixture of gypsum, salt, and water was used as a skull bone simulator. The validation of the phantom was conducted through Hounsfield Units (HU) assessments to verify the homogeneity and compatibility with the ATOM phantom. Homogeneity was confirmed with a variation of 28.1% in the PLA component and 6.6% in the gypsum mixture. The results also demonstrated compatibility with the materials of the ATOM phantom. The phantom was successfully constructed and validated, making it suitable for testing as a dosimetric system for evaluating doses in the ocular region during radiotherapeutic procedures. Read full article

Restoration of culturally significant wooden artifacts using gamma radiation curable polyester resins

Abstract: The preservation of cultural artifacts, particularly those made of wood, is a significant concern for conservators due to their susceptibility to damage from xylophagous organisms, fungi, and bacteria. This study investigates the use of gamma radiation to cure polymeric resins for the consolidation of three wood species: cedar (Cedrela spp.), canafistula (Peltophorum dubium), and ivorywood (Balfourodendron riedelianum). Various resins, including polyester LP 8847® combined with styrene, were subjected to gamma radiation to induce cross-linking without the need for catalysts. The results demonstrated that gamma radiation effectively cured the resin, filling wood pores and enhancing structural integrity. The analysis of apparent density showed that cedar, canafistula, and ivorywood exhibit different absorption capacities, with cedar absorbing the most resin and canafistula the least. Optical and Scanning Electron Microscopy confirmed the efficient penetration of resin into the wood samples, indicating that gamma radiation can be a viable technique for wood consolidation and protection against degrading agents. Read full article