| 摘要 |
<p>PROBLEM TO BE SOLVED: To inspect the grout defect of a PC steel material in concrete in a non-destructive manner by a neutron beam scattering or transmitting method. SOLUTION: A neutron source 1 and a detector 2 are provided and, since the transmission factor or scattering factor of the neutron beam from the neutron source is different in a grout defect part, transmitted or scattered neutron beam is detected on opposed surfaces or the same surface. At this time, in order to effectively utilize neutron beam, a polyethylene, carbon or iron plate is arranged to the rear surface of the neutron source as a reflecting material 3 and, if necessary, a polyethylene or iron plate is further arranged to the front surface of the detector as a speed reducing material 4.</p> |
