Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (05): 50204-050204.doi: 10.11889/j.0253-3219.2014.hjs.37.050204

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

Establishment and application of the cyclic neutron activation analysis method on mini-reactor

JIANG Huaikun1,2 JIANG Yun1,2 ZHANG Chunfa2 ZHANG Wenjuan1   

  1. 1(Key Laboratory of Geological Processes for Mineralization of Metal Mineral and Resources Utilization in Shandong Province, Jinan 250013, China) 2(Shandong Institute of Geological Sciences, Jinan 250013, China)
  • Received:2014-01-26 Revised:2014-03-04 Online:2014-05-10 Published:2014-05-08

Abstract:

Background: Instrument neutron activation analysis is a nondestructive analytic method. Some elements after irradiation produce short half-life radio-nuclides (<60 s), and others produce both long-lived and short-lived nuclides. For these short-lived nuclides, the single measurement has big error. Purpose: In order to reduce the error, cyclic neutron activation analysis can be used to improve the sensitivity. Methods: A device was designed to be connected to the sample transporter, detector and irradiation pipeline in the reactor, which can automatically control the irradiation time and counting time. According to the nuclear parameters of certain elements, irradiation time and counting time and cycle times were determined by experiment. Cyclic activation analysis method was established at the mini-reactor. Results: This paper studied cyclic activation analysis conditions of 17 kinds of element, and applied to the determination of actual samples. Cyclic epithermal neutron activation analysis (CENAA) method was discussed too. By the analysis of national standard reference materials, the reliability of this method was confirmed. Conclusion: Cyclic neutron activation analysis (CNAA) is an effective analytic method for only short life nuclide elements. For both short and long lived nuclides of elements, the cyclic activation analysis method can make the analytical cycle shorten, from a few days or several weeks to within a few minutes. Cyclic activation analysis has the advantages of high sensitivity, and its precision and accuracy are better than single short irradiation activation analysis.

Key words: Cyclic neutron activation analysis (CNAA), Miniature reactor, Method validation, Application