I wouldn't mind hearing about this myself. We don't have F-18 , but we do have short lived, positron only emitters that are similar. Any inovative ideas might be put to some use. K. Welch CEBAF welch@cebaf.gov >hello, >i am interested in how other sites identify and control exposure to fluorine- >18. if possible, please email schumanv@nimo.com. >thanks >vince > > KW