Patent ID: 7689020
Filing Date: 2010-03-30
Classification: G01N

Abstract:
1. A method for examining a defect in a prestressed tendon, comprising steps of: (a) obtaining a prestressed concrete having a prestressed tendon; (b) obtaining position of said prestressed tendon; (c) locating a comparing object outside of said prestressed concrete; (d) locating a radiation source outside of said prestressed concrete; (e) radiating a ray penetrating through said prestressed concrete to project said prestressed concrete and said comparing object on an imaging device; and (f) obtaining defect size of said prestressed tendon with images obtained after said projecting, wherein said radiation source radiates a ray selected from a group consisting of Ir(Iridium)-192, Co(Cobalt)-60 and Cs(Cesium)-137; and wherein said ray has a radiation intensity between 68 Ci(Curie) and 82 Ci.