We're always available on Slack, Bitcointalk, or by email. The Projectradon account is offline the majority of the time because it is only used to maintain the main page of the thread. We are busy coding every single day, and therefore don't have as much time to engage with the community on Bitcointalk as we would like. Radium is far, far from dead.

Best regards,
-Tim M.
TM2013