| | | Radiometric measurements and weld inspections Radiometric level gauges have proved themselves indispensable, especially in the chemical industry, due to their universal usage and reliability. The measurement is contact-free and requires no changes to the vessel. They are therefore widely used, particularlyin difficultprocesses. Problems can occur however, when weld or material inspections are performed at the plant site. During these inspections very strong radioactive sources are employed, sometimes 10,000 times stronger than the source of the measuring system. This additional radiation field during weld inspections leads to a strong rise in count rate at the detector and a seemingly dropping fill level. As a result, considerable problems in the process can occur - in the worst case, vessel overflow with severe consequences for plant and personnel safety. Up to now, detectors were often covered with heavy and expensive lead shieldings. Weld tests were strongly regulated and the source | | |