you can actually find cobalt 60 source, for private investigation detective companies, or personal security

identiFINDER R400 (Formerly identiFINDER 2)

The world’s leading, smallest, and lightest handheld radiation detector

http://www.flir.co.uk/threatdetection/display/?id=63333

FLIR.CO.UK

identiFINDER R400 | FLIR Systems

The R400 is able to rapidly detect, quickly locate, accurately measure and precisely identify gamma emitting radionuclides.