Co-60 content in the spent graphite masonry of commercial reactors at the Siberian Chemical Combine

Citation
Av. Bushuev et al., Co-60 content in the spent graphite masonry of commercial reactors at the Siberian Chemical Combine, ATOM ENERGY, 86(3), 1999, pp. 183-188
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Nuclear Emgineering
Journal title
ATOMIC ENERGY
ISSN journal
1063-4258 → ACNP
Volume
86
Issue
3
Year of publication
1999
Pages
183 - 188
Database
ISI
SICI code
1063-4258(199903)86:3<183:CCITSG>2.0.ZU;2-J
Abstract
Some results of comprehensive investigations of the radioactive contaminati on of graphite masonry from shutdown commercial uranium-graphite reactors a t the Siberian Chemical Combine are reported. The objective of the investig ations was to study the distribution of radionuclides and to determine the contamination level. In the present paper information about Co-60 in the gr aphite of the I-1 and EI-2 reactors is reported. Its content in the samples was measured by gamma-spectrometry. There were about 250 graphite samples from the I-1 reactor and 200 from EI-2. According to the data obtained, the surface contamination level of the blocks can be taken as the same for the entire core within the limits of the errors presented. The average Co-60 c ontamination of the graphite in the surface of blocks from the I-1 core is 5600(-500)(+500) Bq/g and 8400(-1000)(+1200) Bq/g for the EI-2. The Co-60 a ctivity in all blocks from the I-1 core is 1.22.10(12) Bq, and for EI-1 the figure is 2.16.10(12) Bq.