Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (7): 70502-070502.doi: 10.11889/j.0253-3219.2016.hjs.39.070502

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Preparation of 151Sm calibration standards for AMS measurement

YIN Xinyi1, HE Ming1, DONG Kejun1, JIANG Shan1, ZHANG Chunhua2, ZHANG Jinsong2, ZHENG Yun2   

  1. 1 China Institute of Atomic Energy, Beijing 102413, China;
    2 Nuclear Power Institute of China, Chengdu 610005, China
  • Received:2016-02-02 Revised:2016-03-16 Online:2016-07-10 Published:2016-07-08
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11205250)

Abstract:

Background: The long-lived fission product 151Sm plays an important role in environmental science, life science, nuclear data, etc. It is interesting to establish a high precise and sensitivity measurement method with Accelerator Mass Spectra (AMS) and develop a series of standards of 151Sm. Purpose: The aim is to develop a series of laboratory reference standards for 151Sm AMS measurements. Methods: The long-lived radioactive nuclide 151Sm was produced via neutron capture reaction of 150Sm by the irradiation of 52.6-mg Sm2O3 (with 150Sm enriched to 87.34%) in the Heavy Water Research Reactor (HWRR) at China Institute of Atomic Energy (CIAE). The 151Sm/150Sm ratio in the irradiated Sm2O3 sample was measured with Thermal Ionization Mass Spectrometry (TIMS) at the Nuclear Power Institute of China (NPIC). This standard 151Sm sample was then diluted with the enriched 154Sm2O3 (154Sm is enriched to 98.61%) to obtain three other standards. Results: The 151Sm/150Sm ratio in the irradiated Sm2O3 sample is 3.75×10-3 (the relative standard deviation is 0.06%) measured with TIMS. Three standards with 151Sm/154Sm ratios of (9.25±0.08)×10-7, (8.87±0.08)×10-8 and (8.08±0.08)×10-9, respectively, were prepared for the calibration in AMS measurement of 151Sm. The concentrations of Sm in standard solution (I) and diluent solution were measured using isotopic dilution mass spectrometry. Conclusion: The measurement method of TIMS for isotope ratio of 151Sm was established. A series of standards was prepared for the calibration in AMS measurement of 151Sm.

Key words: AMS, 151Sm, Calibration standards, Thermal ionization mass spectrometry

CLC Number: 

  • TL92