Electrical hazard. 2. Radiation hazard. (a) Ionising (Alpha, Beta, Gamma, X-rays, neutrons, etc.) (b) Non-ionising (UV, IR, Microwaves, Laser beams, etc.) 3. Expose to Sound and vibration 4. Mechanical hazard ( unguarded machine, no fencing, no safety device, no control device, unsafe, machine, equipment, instruments, etc.)