Article Sidebar

PDF
Published: 2024-02-20
Abstract Views: 104
Views PDF: 54
DOI: https://doi.org/10.53747/nst.v13i1.403
Issue
Vol. 13 No. 1 (2023)
Section
Articles
How to Cite
Nguyen , T. T. N., Le, N. S. ., & Nguyen, B. T. . (2024). Effective dose evaluation for external exposure from surface soil by using resrad-onsite code. Nuclear Science and Technology, 13(1), 19-28. https://doi.org/10.53747/nst.v13i1.403

Effective dose evaluation for external exposure from surface soil by using resrad-onsite code

Nguyen Thi Thanh Nga1, Le Nhu Sieu 2, Nguyen Bich Thuy 2
1 NRI
2 Dalat Nuclear Research Institute

Main Article Content

Abstract

An annual effective dose evaluation from Dong Nai surface soil (45 samples) to humans was carried out in this work. ResRad-Onsite software has been applied to estimate the maximum exposure dose by considering different exposure levels across an area of ​​5905.7 km2 with a topsoil thickness of 20 cm. The calculation grid used in ResRad Onsite software is divided in the form of a circle of radius 3, 5, 10, 20, and 30 km, respectively, calculated from the circle center in terms of 16 wind directions. A high-purity germanium detector (HPGe) was used to determine 238U, 232Th, 226Ra, 137Cs, and 40K isotopes. The range activity concentrations of them were found to be 6.46 ÷ 48.11; 13.95 ÷ 58.75; 5.71 ÷ 35.27; 0.15 ÷ 1.23 and 6.7 ÷ 222; mBq/g, respectively. The isotope 239,240Pu was determined by the radiochemical separation method, measured on the alpha spectrometer system, and the calculated value range is 0.009 ÷ 0.073 mBq/g. The activity of 90Sr was determined by separation technique, measured on a low-background alpha/beta total counting system (MPC 9300) with a calculated value range of 0.10 ÷ 0.83 mBq/g. By ResRad-Onsite code, the external effective dose derived from the ground (excluding Radon’s contribution) is calculated to be 170 ÷ 658 µSv/year with an average value is 368.6 µSv/year. The external dose from the soil is 136.5 µSv/year (accounting for 37%). The results showed that the annual radiation dose distribution derived from the ground equivalent to the average of some different regions in the territory of Vietnam and the world. In addition, the external effective dose from the ResRad-Onsite code tended to be about 1.36 times smaller than the practical measured due to the library’s different dose conversion coefficients.

Article Details

Author Biographies

Le Nhu Sieu , Dalat Nuclear Research Institute

01 Nguyen Tu Luc st., Dalat city, Lam Dong province

Nguyen Bich Thuy , Dalat Nuclear Research Institute

01 Nguyen Tu Luc st., Dalat city, Lam Dong province

Keywords

External effective dose, ResRad-Onsite, surface soil

References

[1]. UNSCEAR, The General Assembly with Scientific Annex, New York, United Nations, 2000.
[2]. ICRP, 1990 Recommendations of International Commission on Radiological Protection, ICRP publication 60, Ann. ICRP 21 (1-3), 1991.
[3]. ICRP, Age-dependent Doses to Members of the Public from Intake of Radionuclides - Part 5 Compilation of Ingestion and Inhalation Dose Coefficients, ICRP publication 72, Ann. ICRP 26 (1), 1995
[4]. Health Effects Assessment Summary Tables, U.S. Environmental Protection Agency Washington, 2001.
[5]. EPA’s Federal Guidance Report No.11, Limiting values of radionuclide intake and air concantration and dose conversion factors for inhalation, submersion, and ingestion, U.S. Environmental Protection Agency Washington, 1988.
[6]. EPA’s Federal Guidance Report No.12, External exposure to radionuclides in air, water, and soil, U.S. Environmental Protection Agency Washington, 1993.
[7]. EPA’s Federal Guidance Report No.13, Cancer risk coefficients for environmental exposure to radionuclides, U.S. Environmental Protection Agency Washington, 1999.
[8]. Yu C. et al., User’s Manual for RESRAD-ONSITE Version 7.2, 2018.
[9]. Yu, C., LePoire, D., Gnanapragasam, E., Arnish, J., Kamboj, S., Biwer, B.M., Mo, T., Development of Probabilistic RESRAD 6.0 and RESRAD-BUILD 3.0 Computer Codes, US Nuclear Regulatory Commission, 2000.
[10]. Yu, C., Orlandini, K.A., Cheng, J.J., Biwer, B.M., Assessing the Impact of Hazardous Constituents on the Mobilization, Transport, and Fate of Radionuclides in RCRA Waste Disposal Units, No. ANL/EAD/TM-93 (2001a), Argonne National Lab., IL (US).
[11]. Yu, C., Zielen, A.J., Cheng, J.J., LePoire, D.J., Gnanapragasam, E., Kamboj, S., et al., User’s Manual for RESRAD Version 6 (2001b), US Department of Energy Office ofScientific and Technical Information, Oak Ridge, TN.
[12]. Sieu Nhu Le et al., Development of population dose evaluation method - Application experiment in Hang Gon - Long Khanh, Dong Nai province, Report on Research Project No. DTCB.05/18/VNCHN for 2018-2019 at level of Ministry of Science and Technology, 2020.
[13]. Huy NQ, Hien PD, Luyen TV, Hoang DV, Hiep HT, Quang
NH, Long NQ, Nhan DD, Binh NT, Hai PS, Ngo NT, “Natural radioactivity and external dose assessment of surface soils in Vietnam”, Radiat Prot Dosim., 151:522–531, 2012.
https://doi.org/10.1093/rpd/ncs033
[14]. Mercy Nandutu and Juyoul Kim, “Radiological Dose Assessment of the Landfill Disposal of Consumer Products Containing Naturally Occurring Radioactive Materials in South Korea”, Appl. Sci., 11, 7172, 2021.
https://doi.org/10.3390/app11157172

[15]. Bello S, N.N. Garba, B.G. Muhammad, Simon J, “Application of RESRAD and ERICA tools to estimate dose and cancer risk for artisanal gold mining in Nigeria”, Journal of Environmental Radioactivity 251-252, 106932, 2022.
https://doi.org/10.1016/j.jenvrad.2022.106932
[16]. ICRP, The 2007 recommendations of the international commission on radiological protection, ICRP publication 103, Ann. ICRP 37 (2–4), 2007.