Application of the Monte Carlo Library Least-Squares (MCLLS) approach for chromium quantitative analysis in aqueous solution

• Published in: Applied radiation and isotopes 2019-08, Vol.150, p.39-42
• Main Authors: Zhang, Yan, Tang, Bin, Jia, WenBao, Zhang, Xiongjie, Wang, Renbo, Li, Fusheng, Gardner, Robin
• Format: Article
• Language: English
• Subjects: Chromium; MCLLS; PGNAA; Relative deviation
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2019.02.018

In the present work, a new in-situ prompt gamma-ray neutron activation analysis (PGNAA) setup was developed for the quantitative measurement of chromium (Cr) in aqueous solutions which consists of a 4" × 4″ inch Bismuth Germanate detector and a 300 mCi 241Americium-beryllium neutron source. A series of standard samples were prepared by dissolving Cr compounds in deionized water of analytical pure grade and measured using the in situ PGNAA setup. Quantitative spectrum analysis was conducted using Monte Carlo Library Least-Squares approach (MCLLS). Simulates of elemental library spectra were in silico modeled using the CEARCPG code, which was developed by Prof. Robin Gardner research group in North Carolina State University. The fitted spectra presented were in excellent agreement with the total experimental spectrum, and the correlation coefficients were all nearly 1. After applying the MCLLS approach, the minimum detectable concentration of Cr was 301.5 mg/L, better than that obtained with other setups, and the relative deviation of the Cr quantitative analysis accuracy was less than 4.09%. •A PGNAA setup was developed for quantitative analysis of chromium (Cr) in aqueous solutions.•Quantitative spectrum analysis was conducted using the Monte Carlo Library Least-Squares (MCLLS) approach.•The minimum detectable concentration of Cr was 301.5 mg/L.•The relative deviation of the Cr quantitative analysis accuracy was less than 4.09%.