Starting in 1987, reports of individual exposures were collected that recorded the specific dose for each monitored individual. The collective dose can be accurately determined by summing the total dose for each individual. Data prior to 1987 is not included in the web page query tool. The number of individuals shown in the query results may be slightly different than the totals presented in other reports due to differences in the accounting for multiple dose records per individual. Monitoring Practices Radiation monitoring practices differ widely from site to site and are based on the radiation hazards and work practices at each site.
Sites use different dosimeters and have different policies on which workers to monitor.
The number of monitored individuals can significantly impact the site s collective dose. Some sites supply dosimetry to virtually all workers. While this tends to inflate the number of monitored workers with no dose, it also can add a large number of very low dose workers to the total number of workers with measurable dose, thereby lowering the site s average measurable dose. Even at low doses, these workers add significantly to the site collective dose. This tends to reduce the number of monitored workers and reports only those workers receiving doses in the higher dose ranges.