X-ray absorption by iodine-containing molecules

X-ray absorption by iodine-containing molecules refers to the interaction of X-rays with molecules that include iodine atoms. Due to its high atomic number (Z = 53), iodine exhibits strong X-ray absorption, making it highly relevant in fields such as medical imaging (e.g., contrast agents for CT scans), nuclear waste management, and materials science. The phenomenon is primarily governed by the photoelectric effect, where the probability of absorption increases sharply at specific energies known as absorption edges—most notably the K-edge for iodine. In organic or inorganic compounds containing iodine, the position of the edge and fine structure features can be influenced by the formal oxidation state of iodine, the chemical environment (e.g., neighboring atoms), and molecular structure (aliphatic vs aromatic).