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| Analysis of measurement results of γ energy spectrum of a rare earth chloride |
| XU Jia'ang, SONG Gang, SU Jing, WANG Xiaoshan, MIN Nan, BI Mingwei, CHEN Yingmin |
| School of Preventive Medicine Sciences (Institute of Radiation Medicine), Shandong First Medical University (Shandong Academy of Medical Sciences), Jinan 260062 China |
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Abstract Objective The measurement results of a rare earth chloride were analyzed to further understand the measurement and analysis of radioactive non-equilibrium samples.Methods The rare earth chloride samples were measured according to China recommendatory national standard of determination of radionuclides in soil by gamma spectrometry (GB/T 11743—2013).Results The rare earth samples were measured three times on April 26, 2019, May 31, 2019, and January 13, 2021, respectively. The activity concentrations of 228Ac in the sample were 3.5×104, 3.5×104 and 2.9×104 Bq·kg−1, respectively. The activity concentrations of 208Tl in the sample were 2.05×103, 2.43×103 and 6.5×103 Bq·kg−1, respectively. The activity concentrations of 227Th in the sample were 7.2×102, 7.7×102 and 7.1×102 Bq·kg−1, respectively. The activity concentrations of 234mPa in the sample were 8.5×102, 7.3×102 and 4.4×102 Bq·kg−1, respectively. The activity concentrations of 214Pb in the sample were 5.5×103, 5.4×103 and 5.6×103 Bq·kg−1, respectively. The activity concentrations of 214Bi in the sample were 6.1×103, 6.0×103 and 6.2×103 Bq·kg-1, respectively. The activity concentrations of 138La at 788.742 keV in the sample were 3.3×101, 2.7×101 and 2.2×101 Bq·kg-1, respectively. The activity concentrations of 138La at 1 435.795 keV in the sample were 5.2×101, 5.2×101 and 5.6×101 Bq·kg−1, respectively.Conclusion The radioactive equilibrium of thorium family and uranium family in the rare earth chloride samples was destroyed. The activity of 227Ac in actinuium-uranium family should be measured 140 days after the completion of the product preparation. When partial radioactivity equilibrium is reached, it is more reliable to choose the γ-ray characteristics peak (1 001.441 keV) of 234mPa to determine the activity of the parent 238U. For the activity measurement of 138La, the γ-ray characteristics peak at 1 435.795 keV should be selected.
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Received: 07 April 2021
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