| 摘要 |
PURPOSE:To enable the specifying of a position and a range of generated reduction in thickness, by measuring intensity of radiation along the outer surface of a piping or the like with a radiation sensor. CONSTITUTION:In a piping or the like made of a material which is liable to form a radioactive clad having a radioactive substance contained in a fluid adhering to the inner wall of a member, the radioactive clad is peeled off at a position where reduction in thickness occurs in the inner wall so that intensity of radiation as measured from the outer surface of the piping becomes less than that of the position where no such a reduction occurs. On the other hand, in a piping made of a material that could make a radioactive substance contained in the fluid hard to adhere to the inner wall of the member and prevent the formation of a radioactive clad, a piping through which the fluid containing radioactive substance passes or the like temporarily, intensity of radiation enhanced at the position with a reduced thickness as compared to the position without such a reduced thickness. Thus, a sensor for detecting radiation is used to measure a distribution of intensity of radiation along the outer surface of the piping or the like, thereby simplifying detection on where a reduction in thickness occurs. |
