Hello Everyone, Can anyone provide me with information on the difference(s) between charcoal filters used to trap 131-I &/or 125-I? Is there a difference? If a filter can trap 125-I, does that mean inherently that it can trap 131-I, or vice-versa? Any other info on the subject would be appreciated greatly. Thanks! Bob Dunn rso.gscancer@worldnet.att.net