Is the DHS preparing for a nuclear event?

DHS has order around 20 million wearable nuclear detection units. This is interesting because we know ISIS has made threats of using dirty bombs and also we had Guccifer come out and say after he hacked several elite's emails that they were preparing to nuke two major cities in the U.S.

http://freedomoutpost.com/dhs-prepares-for-nuke-attack-with-massive-order-for-radiation-detectors-to-ensure-nuclear-devices-arent-secretly-being-transported-in-public-areas/#!