# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (2): 020201

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

### Enhancement of neutron irradiation uniformity for the CFBR-II fast burst reactor with a biaxial rotational technique

LIANG Wen-Feng (梁文峰),1, 2, y QIU Dong (邱东),1, 2 XIANG Wei-Ling (项伟灵),1, 2 and SUN Wen-Qing (孙文清)1, 2

1. 1CAEP Key Laboratory of Neutron Physics, Mianyang 621900, China
2Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
• Contact: LIANG Wen-Feng E-mail:liangwf@caep.cn; liang wen feng@163.com
• Supported by:

Supported by National Science Foundation of China (No. 11305152)
and Science and Technology Development Foundation of CAEP
(Nos. 2014B0103006 and 2012A0103002)

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LIANG Wen-Feng, QIU Dong, XIANG Wei-Ling, and SUN Wen-Qing . Enhancement of neutron irradiation uniformity for the CFBR-II fast burst reactor with a biaxial rotational technique.Nuclear Science and Techniques, 2015, 26(2): 020201

Abstract:

A biaxial rotational technique is proposed to improve the neutron irradiation uniformity for a large sample,
and the theoretical method is established to predict and design the main parameters. The technique used a device
to rotate the target sample around two perpendicular axes simultaneously. Numerical calculations found
that the lowest common multiple of the two angular speeds should be large enough to improve the uniformity,
and the minimal experimental time should be no less than 600 s. For a three-dimensional sample with a size
of 20 cm  12 cm  14 cm, the maximal non-uniform neutron irradiation factor of the sample is mainly determined
by the distance between the center of the sample and of the point neutron source. It was computed to be
less than 10% when the distance was no less than 34 cm. Experiments were carried out on the CFBR-II reactor
and the experimental results were in good accordance with the theoretical analysis. As a result, the theoretical
conclusions given above are reasonable and of reference value for the design of future irradiation experiments.