Radium-228 is a radioactive isotope of radium that is part of the uranium decay series. It has a half-life of about 5.75 years and decays into actinium-228. This isotope is found in trace amounts in nature, primarily in uranium ores and certain mineral deposits. Radium-228 emits alpha particles and gamma radiation, making it a subject of interest in both scientific research and health studies. Due to its radioactivity, exposure to radium-228 can pose health risks, particularly if ingested or inhaled. Proper safety measures are essential when handling materials containing this isotope.