Patent Number: 046631127
Section: claims

1. Method for determining the contents of a fuel rod containing fuel pellets of pure uranium dioxide and doped fuel pellets within a test range extending along the length of the fuel rod which comprises concentrically surrounding the fuel rod with a test coil and moving the test coil from the beginning to the end of the test range, measuring the impedance of the test core as a function of its position during movement, and feeding the test coil an a-c voltage with a frequency below 10 kHz to produce a measurement value in the region of a fuel pellet of pure uranium dioxide which clearly distinguishes from a measurement value in the region of a doped fuel pellet. 2. Method according to claim 1, wherein the measured values are recorded by a recorder as a function of the position of the test coil within the test range extending along the length of the fuel rod in the form of a measurement profile. 3. Method according to claim 2, wherein the measurement profile of the fuel rod to be tested is compared with a desired profile of a good fuel rod and, wherein as a result of this comparison, a switch is set for sorting the fuel rods subsequent to the measurement to separate fuel rods not having desirable characteristics.