http://en.wikipedia.org/wiki/Film_badge_dosimeter http://en.wikipedia.org/wiki/Film_badge_dosimeter If I am understanding that article correctly, it is used no

http://en.wikipedia.org/wiki/Film_badge_dosimeter http://en.wikipedia.org/wiki/Film_badge_dosimeter If I am understanding that article correctly, it is used not as an alert but as a record of how much cumulative exposure a person has received while in a hazardous area.