A hand held radiation detector may be used for scanning of a surface from a distance to obtain a gross indication of temperature variations in the surface. The radiation detector is provided with a nosepiece having a conical cup therein which can be placed directly against a surface. The radiation sensor...http://www.google.com.au/patents/US4636091?utm_source=gb-gplus-sharePatent US4636091 - Radiation detector having temperature readout
