System for discriminating radiation-contaminated fragments and apparatus for measuring radioactivity of fragments.

摘要

A system for discriminating radiation-contaminated fragements (1) on the basis of a predetermined radioactive concentration includes a detection device (7) for detecting the radiation of the fragments (1), the detection device (7) having a path (88) of transfer of the fragments (1), at least one radiation detector (2) disposed at one of the inside and outside of said transfer path (88), and a transfer device (83; 90; 98) for sequentially transferring the fragments (1) in the transfer path (88); a convey device (42) for conveying the fragments (1) to said detection device (7); and a controller (100) for determining the radioactive concentration of the fragments (1) in accordance with the radiation detected by the detection device (7) and for judging whether or not the radioactive concentration of the fragments (1) is the predetermined radioactive concentration. The controller (100) is also operable to control the transfer device (83; 90; 95; 98) so as to adjust the speed of transfer of the fragments (1) in the transfer path (88). The system further includes a density detecting device (39) for detecting the density of the fragments (1) to be conveyed to the detection device (7). The controller (100) corrects the above determined radioactive concentration by the density detected by the density detecting device (39).