The full chemical symbol for an element shows its nucleon number (A) at the top, and its proton number (Z) at the bottom. This symbol tells you that the chlorine atom has 17 protons. It will also ...

The IAEA is supporting experts from around the world in using nuclear techniques such as radiation-based technology to understand and preserve ...

It is normally emitted alongside alpha or beta radiation. Gamma ray emission causes no change in the number of particles in the nucleus meaning both the atomic number and mass number remain the same.

The IAEA promotes a number of dedicated tools to assist regulatory bodies in strengthening the effectiveness of their functions and processes: Aside from these tools for nuclear regulators, the IAEA ...