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Vuong LQ, Thanh TT, Ho PL, Hao LC, Van Tao C. Simultaneous correction of the coincidence summing and self-absorption for radioactivity measurement in solid samples by MCNP-CP code. J Radioanal Nucl Chem 2023. [DOI: 10.1007/s10967-023-08773-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Robustness of LabSOCS calculating the Ge detector efficiency for the measurement of radionuclides. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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A Practical Procedure to Determine Natural Radionuclides in Solid Materials from Mining. MINERALS 2022. [DOI: 10.3390/min12050611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
There are many regulations related to the radiological control of NORMs (Naturally Occurring Radioactive Materials) in activities such as mining, industry, etc. Consequently, it is necessary to apply fast and accurate methods to measure the activity concentrations of long-lived natural radionuclides (e.g., 238U, 234,232,230,228Th, 228,226Ra, 210Pb, 210Po, and 40K) in samples characterized by a wide variety of compositions and densities, such as mining samples (wastes, minerals, and scales). Thus, it is relevant to calculate the radioactive index (RI), which summarizes for all radionuclides the ratio between the activity concentration and its respective threshold activity concentration as established by regulations, in order to classify a material as a NORM. To proceed with the determinations of these radionuclides, two spectrometric techniques based on both alpha-particle and gamma-ray detections should be employed. In the case of gamma-ray spectrometry, it is necessary to correct the full-energy peak efficiency (FEPE) obtained for the calibration sample, εc, due to self-attenuation and true coincidence summing (TCS) effects. The correction is especially significant at low gamma emission energies, that is, Eγ < 150 keV, such as 46 keV (210Pb) and 63 keV (234Th). On the other hand, in samples which contain radionuclides that are in secular disequilibrium with others belonging to the same series (238U or 232Th series), like wastes or intermediate products, it is necessary to measure some pure-alpha emitters (232Th, 230Th, 210Po) by employing alpha-particle spectrometry. A practical and general validated procedure based on both alpha and gamma spectrometric techniques and using semiconductor detectors is presented in this study.
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Cuesta E, Barba-Lobo A, Lozano R, San Miguel E, Mosqueda F, Bolívar J. A comparative study of alternative methods for 210Pb determination in environmental samples. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109840] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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