An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation. Approximately 5,000 natural and artificial radioisotopes have been identified.
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- Academic, Industrial, and Research Radiation Safety
- Accelerator
- Decommissioning
- Early-Career Professionals
- Environmental/Radon
- Homeland Security and Emergency Response
- Instrumentation
- Medical Health Physics
- Military Health Physics
- Nonionizing Radiation
- Power Reactor
- Women in Radiation Protection
- Committees
- Submit Committee Report
- Committee Reports
- Academic Education Committee
- Accredited Standards Committee N13, Radiation Protection
- Accredited Standards Committee N43, Equipment for Non-Medical Radiation Applications Committee
- Awards Committee
- Continuing Education Programs Committee
- Executive Committee
- Finance Committee
- Government Relations Committee
- History Committee
- International Collaboration Committee
- Intersociety Relations Committee
- Liaisons to Other Organizations
- Local Arrangements Committee
- Marketing Ad Hoc Committee
- Membership Committee
- Mentorship Committee
- Nominating Committee
- Professional and Ethical Conduct Committee
- Program Committee
- Public Information Committee
- Rules Committee
- Science Support Committee
- Scientific and Public Issues Committee
- Society Support Committee
- Standards Committee
- Strategic Planning Committee
- Student Support Committee
- Title Protection Committee
- Careers
- Donate