here are a few preparedness related links that contain information you may find valuable.
The Institute For Biosecurity-
http://www.bioterrorism.slu.edu
Biosecurity & Bioterrorism/Health Security Journal-
http://online.liebertpub.com/doi/abs/10.1089/bsp.2013.0086
Dirty bomb fact sheet
http://www.nrc.gov/reading-rm/doc-collections/fact-sheets/fs-dirty-bombs.html
Ready.gov water management tips-