If remediation is the chosen alternative at a site, a combination of engineering, administrative, and personnel protective equipment controls are put in place to ensure the safety of site workers, people on site (where applicable), and surrounding neighbors. Site workers are required to wear protective clothing and a thermoluminescent dosimeter, which is a device that measures radiation exposure. In addition, they wear personal monitors that measure daily air quality. Perimeter air monitors are also placed around the site with samples taken and data evaluated on a daily basis, and engineering controls for dust management (such as watering down the material for excavation) are used as well.