Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques ›› 1995, Vol. 6 ›› Issue (3): 129

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STUDY ON MODERATORS OF SMALL-SIZE NEUTRON RADIOGRAPHY INSTALLATIONS WITH NEUTRON TUBE AS SOURCE

Ma Weichao (马维超)1, Zhou Mingda (周明达)1, Li Zhongmin (李忠民)1, Wu Zhizhong (吴执中)2   

  1. 1 Northeast Normal University, Changchun 130024, China;
    2 Jilin University of Technology, Changchun 180025, China
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Ma Weichao (马维超), Zhou Mingda (周明达), Li Zhongmin (李忠民), Wu Zhizhong (吴执中). STUDY ON MODERATORS OF SMALL-SIZE NEUTRON RADIOGRAPHY INSTALLATIONS WITH NEUTRON TUBE AS SOURCE.Nuclear Science and Techniques, 1995, 6(3): 129

Abstract: Calculation of moderator analogues for 14 MeV neutrons as source were made at a IBM/PC AT computer using TAMAKER-ANISN program and 46 groups (25 neutron groups, 21 photon groups) UW cross section data. The intensifying effect of lead and natural uranium for moderating 14 MeV neutrons is confirmed. Adopting proper structure of the moderator, the intensifying factor M (times) may be larger than 3. Using lead and natural uranium in sub-critical assemblies (or call boosters), with 14 MeV neutrons as source, with the same dimension as that of above, the intensifying effect is also confirmed. With a proper structure of sub-critical assembly, the intensifying factor M may be close to or even larger than (1-k)-1 where k is the effective multiplication factor.

Key words: Sealed neutron tube, Neutron radiography, Moderator, Intensifying materials, Computer calculations