Radiology Nowadays radium is not used in the Rx of cancer because: A It decays faster and needs frequent replacement B It decays into daughter Radon which is a constant hazard C It has a very long half life D It is a very unstable element 💡 Explanation Nowadays radium is not used in the Rx of cancer because: ✓ Correct Answer: B. It decays into daughter Radon which is a constant hazard