This submodule deals with two topics that are not chemicals in the environment: radiation and worker health and safety. Radiation risk assessments are specialized. If a site or situation has a radiation hazard, experts are called in. I am a Certified Industrial Hygienist, an expert in workplace health hazards, so I have had some training in this area. However when I come across a radiation issue, I consult with a health physicist. That is the profession that deals with radiation health hazards. I can give you some general information. The second topic is workplace health and safety in general. Here I will give you some general information that is pertinent to hazardous waste sites, a place risk assessors frequently go.