The present invention relates to a new type of metabolizable gold nanodandelion (GND), which possesses features: (1) large scale green synthesis with high monodispersity and a circa 100% yield； (2) cellular/physiological degradability； (3) precision control of the shape, size and petal number； (4) highly efficient radiotheranostics encompassing better enhanced CT contrast and pronounced x-ray induced ROS generation than conventional spherical AuNP.本發明係關於一種新型可代謝花狀金奈米粒子(Gold Nanodandelion,GND)，具有以下特點：(1)可綠色合成方法放大合成，單粒徑分散性高，產率約100%；(2)具細胞/生理降解性；(3)可精確控制GND形狀，大小和花瓣數量；(4)高效放射診斷及治療包括明顯的比傳統球形金奈米粒子更好的增強CT對比度和X射線誘導之ROS生成。
