Health and safety officers execute plans for the improvement of work environments and cultures. They assess risks and interview employees to ensure the work environment is compliant with health and safety rules, as well as ensuring the interaction within the workplace occurs in a positive and productive manner. If employed in a healthcare facility the health and safety officer has to investigate infections spreading across a facility and advice all employees how to combat and prevent infections. Furthermore health physics is applied at facilities where people are exposed to ionizing radiation such as nuclear power plants and research institutions.