Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (4): 40402-040402.doi: 10.11889/j.0253-3219.2019.hjs.42.040402

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Development of neutron depth profiling system at CARR

Chanjuan TANG1,Caijin XIAO1(),Yonggang YAO1,Cong SHI1,2,Weixu YUN1,2,Xudong LIU1,Junkai YANG1,Bangfa NI1   

  1. 1. Nuclear Physics Institute, China Institute of Atomic Energy, Beijing 102413, China
    2. College of Nuclear Technology and Automation, Chengdu University of Technology, Chengdu 610051, China
  • Received:2018-12-20 Revised:2019-03-12 Online:2019-04-10 Published:2019-04-18
  • Contact: Caijin XIAO E-mail:13811340271@139.com
  • About author:<named-content content-type="corresp-name">TANG Chanjuan</named-content>, female, born in 1994, graduated from Chengdu University of Technology in 2016, master student, major in particle physics and nuclear physics|<named-content content-type="corresp-name">TANG Chanjuan</named-content>, female, born in 1994, graduated from Chengdu University of Technology in 2016, master student, major in particle physics and nuclear physics|XIAO Caijin, E-mail: <email>13811340271@139.com</email>
  • Supported by:
    Supported by National Natural Science Foundation of China(No.11275276, No.11475266)

Abstract: Background

Neutron depth profiling (NDP) is a non-destructive near-surface analysis technique and it is widely used in characterization of polymers, semiconductors, alloys, lithium ion battery materials, photoelectric materials and many other materials.

Purpose

This study aims is to develop NDP system to obtain the depth profiles of several crucial light nuclides (e.g., 6Li and 10B) in nearly any substrate.

Methods

Based on the cold neutron beam of China advanced research reactor (CARR), a NDP system was developed with vacuum reached 3.4×10?5 Pa and neutron flux rate of 4.8×108 cm?2?s?1. The standard reference material (SRM-2137) sample was used to test the performance of this NDP system. The measured α-particle spectrum was calculated by the inversion iterative algorithm to obtain the depth profiles of crucial elements.

Results

The experimental results show that the simulation results of SRM-2137 agree well with the experimental results. The maximum error is less than 4% at each layer of 5 nm thickness. The peak depth is very close to the reference value (188 nm). The depth accuracy is 0.53%.

Conclusions

Established CARR-NDP system and relevant experiments and data analysis techniques have been verified. The system will be further applied to investigating the lithium ion batteries, multilayer films and high-temperature alloys, etc.

Key words: Neutron depth profiling, CARR, Near-surface analysis