The radiological characterization includes: the collection and review of historical file; the performing calculation of radionuclide inventory in the reactor; in situ measurement; sampling analyses; the review and evaluation of the data obtained; the comparison of calculated result with measured date etc. The special attention should put to the information from the key part in reactor for end state radiological characterization. The sampling from the “hot spot” should not be lost; the number of the sampling should reasonable base on reliable statistics. The radioactivity density for site release should comply with the guide, standard and regulation of international atomic energy agency and our country.

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