- radiogold colloid
- A radioactive isotope of gold emitting negative beta particles and gamma radiation, with a half-life of 2.7 days; formerly used for irradiation of closed serous cavities in the palliative treatment of ascites and pleural effusion due to metastatic malignancies, and for liver scans. SYN: 198Au colloid, colloidal radioactive gold.
Medical dictionary. 2011.