Here's that excellent independent film about a family dealing with nuclear fallout...

Right At Your Door (2007)



[link to en.wikipedia.org]

"Right at Your Door is a 2006 American thriller film about a couple and follows the events surrounding them when multiple dirty bombs detonate in Los Angeles."

It seemed very realistic, good performances, there's a real intensity about the film, reasonable soundtrack, etc. I think some people were overly critical of the film. It's not an action flick. It's not a big Hollywood film. It doesn't have major special effects. It does however capture the likely struggle of someone coping with a dirty bomb.