Free Radius and Squid

Hello, I'm very new to free raduis and would like to know if it will run with squid proxy server. If so how would this work? What I am looking to do is to allow users to access the internet via the transparent squid proxy for limited time sessions. Eg. a user who wishes to use the system would be greeted by a web page asking for a code. The code (which they would get from the system admin) would grant them access for 1 hour. Can this be done using FreeRadius and Squid? Sean.