Graph illustrating collective radiation exposure (person-centisievert) for the period between 1989 and 2001. Graph starts high in 1989 at around 400 then drops slowly floating between 350 and 250 from 1990 and 1992, between 250 and 150 from 1993 and 1995, between 150 and 50 from 1996 and 1999, and below 50 in 2000 and 2001.
Note: The total radiation dose received by workers at nuclear plants is an indicator of the effectiveness of the controls on personal radiation exposure. Worker radiation dose shows a significant reduction since 1989.