caa a22 4500 606150269 CHVBK 20210128100538.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10512-015-9955-z doi (NATIONALLICENCE)springer-10.1007/s10512-015-9955-z Determination of the Parameters of Plutonium Blocks Placed Inside Containers [Elektronische Daten] [V. Dulin, V. Dulin] Measurements were performed with 1.05 and 3.15 kg plutonium blocks with known (nominal) 239Pu fractions 88.7, 91.0, 93.2, and 95.2% in order to check the possibility of determining their mass and enrichment by using a neutron detector - an active well coincidence counter (AWCC). Analysis of double and triple neutron-neutron coincidences was performed taking spatial effects into account. The intensity of the source of spontaneous fissions in the block and thereby the effective mass of 240Pu were determined on the basis of the requirement that the neutron multiplicities obtained from double and triple coincidences are the same. The 239Pu content was determined to within 0.003-0.004 (1σ), which makes it possible to reliably determine the 239Pu content in the blocks, equal to 91% (power-grade) and 93% (weapons-grade). The plutonium mass in a block is determined to within ±2-3% from the obtained effective neutron multiplication factor. Springer Science+Business Media New York, 2015 Dulin V. State Science Center of the Russian Federation - Leipunskii Institute for Physics and Power Engineering (GNTs RF - FEI), Obninsk, Russia aut Atomic Energy Springer US; http://www.springer-ny.com 118/1(2015-05-01), 52-56 1063-4258 118:1<52 2015 118 10512 https://doi.org/10.1007/s10512-015-9955-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10512-015-9955-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dulin V. State Science Center of the Russian Federation - Leipunskii Institute for Physics and Power Engineering (GNTs RF - FEI), Obninsk, Russia aut NATIONALLICENCE 773 0- Atomic Energy Springer US; http://www.springer-ny.com 118/1(2015-05-01), 52-56 1063-4258 118:1<52 2015 118 10512