"Radiumize" is a scientific term used to describe the process of treating a surface or substance with radium to make it radioactive. However, there are several synonyms that can be used to describe this process. One such term is "radioactivate," which means to make something radioactive. Another synonym for "radiumize" is "irradiate," which refers to the process of exposing something to radiation. Additionally, "contaminate" can also be used to describe the presence of radium in a material or surface. These synonyms are commonly used in scientific literature to describe the treatment of materials with radium or other radioactive substances.