| 摘要 |
PURPOSE:To make it possible to detect the internal state of a heat exchanger without stopping the operation of the heat exchanger, by providing a dose source and a sensor etc. CONSTITUTION:Drive apparatuses 20 are provided at the lateral position of a heat exchanger to be inspected. At this time, the mount jigs 25 of the apparatuses 20 are moved to the uppermost or lowermost parts of main bodies 24 and made movable downwardly or upwardly from this state in synchronous relation to each other by the operation of a motor controller 26. In this state, collimators 29 and sensors 23 are mounted to the mount jigs 25 and the power sources of the apparatuses 20 are closed to adjust the heights of the collimators 29 and the sensors 23 so as to bring both of them to the same height. Next, the switch of each apparatus is closed and a dose source 22 is fed out to the position of the collimator 29 by a controller 28 and a recorder 40 and each apparatus 20 are further operated to enter measurement. In this measurement, the quantity of transmitted radioactive rays emitted from the dose source 22 and passed through the heat exchanger to be inspected and detected by the sensor 23 is reduced by a heat exchange tube to be inspected. Because the gaseous phase quantity of a gaseous phase part is large, an internal state can be estimated. |
