This chapter explains the media which provide notice of radiation and radioactive materials to anyone in the proximity of the possible hazards. It presents the required labels and the limits of radiation coming from the packages. Federal regulation requires that any package that contains radioactive material must be labeled stating the package contents. Package labeling, vehicle placarding, and room/area signs can alert emergency response personnel to the presence of radioactive materials or sources of radiation. Unless excepted, each package containing radioactive materials is required to be so labeled and each room or area housing a radiation source or radioactive materials must be posted with a sign so stating. All packages containing radioactive materials will in fact emit radiation. Radiation emitted from the packages is permissible in the transport of radioactive materials but only to a certain level, depending on the contents and the package.