Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (1): 10203-010203.doi: 10.11889/j.0253-3219.2017.hjs.40.010203

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

A fast neutron fluence monitor method based on 103Rh(n,n')103Rhm reaction

LI Da1, CHEN Da1,2, JIANG Xinbiao1, QI Tietao1, YU Qingyu1, YU Xiaoren1, ZHANG Jihong1, ZHANG Wenshou1   

  1. 1 State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an 710024, China;
    2 Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2016-07-27 Revised:2016-11-20 Online:2017-01-10 Published:2017-01-11
  • Supported by:

    Supported by National Natural Science Foundation of China Youth Science Foundation Project (No.11305127), Research Foundation of the State KeyLaboratory of Strong Pulse Radiation Environment Simulation and Effect (No.SKLIPR1216)

Abstract:

Background: Accurate neutron energy spectra and neutron flux parameters are needed to provide the neutron beam service for the reactor users. Purpose: The aim is to accurately measure the fast neutron fluence in Xi'an pulsed reactor. Methods: A neutron fluence monitor method based on 103Rh(n,n')103Rhm reaction was presented. According to the difference of half-life of interference nuclides, cool-down time and measuring time are properly selected to reduce impacts of interference nuclides during the 103Rh(n,n')103Rhm activation rate measurements. On the basis of 152Eu calibration experiment results, the Monte Carlo model of detector was established with optimized detector size by genetic algorithm, the problem of detector efficiency calibration and ray self-absorption was solved. Results: A fast neutron fluence monitor experiment based on this method has been performed, the result of which was consistent with Fe, S, and Ni. The uncertainty of measurement is 13.1%. Conclusion: The establishment of this method successfully solved the problem of fast neutron fluence monitoring in Xi'an pulsed reactor.

Key words: Fast neutron fluence, Neutron spectrum, Uncertainty analysis, Activation foils, Xi'an pulsed reactor

CLC Number: 

  • TL375.4