@@ Gold nanorods have valuable optical properties that are relevant for many biolmedical applications, including extensive light absorption in the visible-near-infrared (NIR) and heat generation on illumination. These properties have been potential applications such as drug delivery, in vivo cellular imaging, and cancer treatment. However, the stability and biocompatibility of these nanomaterials still need improvement for further biomedical application. Intense X-ray irradiation was recently used to stimulate the synthesis of nanoparticles producing highly stable and clean nanosols. A green and novel one pot synthesis method to form different aspect ratios of gold nanorods using attenuated synchrotron X-ray irradiation is reported in this paper.