Development of the in-situ monitoring system for pipe internal contamination measurement in the decommissioning site

The in-situ monitoring system of pipe internal (IMSPI) was developed for transporting a variety of survey tools into pipes. Tools available for use with the system include alpha, beta and gamma-ray detectors and video cameras. In the IMSPI, phoswich detector for simultaneous measurement of alpha- and beta-particles and CdTe detector for gamma-rays were used. The phoswich detector composed with ZnS(Ag) and plastic dual scintillator was manufactured, which could be applicable in the contamination monitoring systems. The IMSPI used a helical gear and automatic controller to transport radiation detectors and video cameras into pipes. And the membrane inserted into a pipe to transfer the characterization tools through the piping, providing a clean conduit through which the detectors and camera could travel. (author)