| CPC G01T 1/16 (2013.01) [G01T 7/00 (2013.01); B01D 15/08 (2013.01)] | 15 Claims |

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1. A system enabling the behavior of a radioactive substance within a structure to be determined, wherein the system comprises:
at least one column through which the radioactive substance moves;
at least one radioactivity detector enabling detection of the radioactive substance within the column; and
at least one actuator enabling the radioactivity detector to move along the column.
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