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Development of Simple and Rapid Radioactivity Analysis for Thorium Series in the Products Containing Naturally Occurring Radioactive Materials (NORM)
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 Title & Authors
Development of Simple and Rapid Radioactivity Analysis for Thorium Series in the Products Containing Naturally Occurring Radioactive Materials (NORM)
Yoo, Jaeryong; Park, Seyoung; Yoon, Seokwon; Ha, Wi-Ho; Lee, Jaekook; Kim, Kwang Pyo;
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 Abstract
Background: It is necessary to analyze radioactivity of naturally occurring radioactive materials (NORM) in products to ensure radiological safety required by Natural Radiation Safety Management Act. The pretreatments for the existing analysis methods require high technology and time. Such destructive pretreatments including grinding and dissolution of samples make impossible to reuse products. We developed a rapid and simple procedure of radioactivity analysis for thorium series in the products containing NORM. Materials and Methods: The developed method requires non-destructive or minimized pretreatment. Radioactivity of the product without pretreatment is initially measured using gamma spectroscopy and then the measured radioactivity is adjusted by considering material composition, mass density, and geometrical shape of the product. The radioactivity adjustment can be made using scaling factors, which is derived by radiation transport Monte Carlo simulation. Necklace, bracelet, male health care product, and tile for health mat were selected as representative products for this study. The products are commonly used by the public and directly contacted with human body and thus resulting in high radiation exposure to the user. Results and Discussion: The scaling factors were derived using MCNPX code and the values ranged from 0.31 to 0.47. If radioactivity of the products is measured without pretreatment, the thorium series may be overestimated by up to 2.8 times. If scaling factors are applied, the difference in radioactivity estimates are reduced to 3-24%. Conclusion : The developed procedure in this study can be used for other products with various materials and shapes and thus ensuring radiological safety.
 Keywords
Naturally occurring radioactive material (NORM);Processed product;Thorium series;Radioactivity analysis;Gamma spectrometry;Monte Carlo simulation;
 Language
Korean
 Cited by
 References
1.
Malling DC, Fiorucci S, Pangilinan M, Chapman JJ, Faham CH, Verbus JR. Dark matter search backgrounds from primordial radionuclide chain disequilibrium. Astroparticle Physics 2013;arXiv:1305.5183.

2.
Guogang J, Jing J. Determination of radium isotopes in environmental samples by gamma spectrometry, liquid scintillation counting and alpha spectrometry: a review of analytical methodology. J. Environ. Radioact. 2012;106:98-119. crossref(new window)

3.
Korob RO, Nuno GAB. A simple method for the absolute determination of uranium enrichment by high-resolution ${\gamma}$ spectrometry. Appl. Radiat. Isot. 2006;64:525-531. crossref(new window)

4.
International Atomic Energy Agency. Extent of environmental contamination by NORM and technological option for mitigation. IAEA technical report series No 419. Vienna, Austria. 2003;55-86.

5.
International Atomic Energy Agency. Radiation protection and NORM residue management in the zircon and zirconia industries. IAEA safety report series No 51. Vienna, Austria. 2007;23-31.

6.
International Atomic Energy Agency. Radiation protection and NORM residue management in the production of rare earths from thorium counting minerals. IAEA safety reports series No 68. Vienna, Austria. 2011;8-22.

7.
Tzortzis M, Tsertos H. Determination of thorium, uranium and potassium elemental concentrations in surface soils in Cyprus. J. Environ. Radioact. 2004;77:325-338. crossref(new window)

8.
Al-Sulaiti H, et al. Determination of the natural radioactivity level in north west of Dukhan, Qatar using high-resolution gamma-ray spectrometry. Appl. Radiat. Isot. 2012;70:1344-1350. crossref(new window)

9.
Tsabaris C, Evangeliou N, Fillis-Tsirakis E, Sotiropoulou M, Patiris DL, Florou H. Distribution of natural radioactivity in sediment cores from Amvrakikos gulf (Western GREECE) as a part of IAEA' campaign in the Adriatic and Ionian seas. Radiat. Prot. Dosim. 2012;150(4):474-487. crossref(new window)

10.
International Atomic Energy Agency. In direct methods for assessing intakes of radionuclides causing occupational exposure. IAEA safety reports series No 18. Vienna, Austria. 2000;49-55.

11.
Garcia-Talavera M, Laedermann JP, Decombaz M, Daza MJ, Quintana B. Coincidence summing corrections for the natural decay series in gamma-ray spectrometry. J. Radiat. Isot. 2001;54:769-777. crossref(new window)

12.
Laborie JM, Petit GL, Abt D, Girard AM. Monte carlo calculation of the efficiency calibration curve and coincidence-summing corrections in low-level gamma ray spectrometry using well-type HPGe detectors. Appl. Radiat. Isot. 2000;53:57-62. crossref(new window)

13.
Ozben CS, Emirhan EM. A hybrid method to determine efficiency curve of HPGe detectors. Appl. Radiat. Isot. 2009;67:1110-1113. crossref(new window)

14.
Pelowitz DB, MCNPX User's Manual, Version 2.7.0. Los Alamos National Laboratory Report LA-CP-11-00438. Los Alamos, NM. 2011;5.106-5.171.

15.
McConn RJ, Gesh CJ, Pagh RT, Rucker RA, Wiliams RG. Compendium of material composition data for radiation transport modeling. PIET-43741-TM-963. Pacific Northwest National Laboratory, Richland, WA. 2011;252-264.

16.
Jin Y, Gardner RP, Verghese K. A semi-emprical model for the gamma-ray response function of germanium detectors based on fundamental interaction mechanisms. Nucl. Instr. and Meth. 1986;A242:416-426.