Application of TLD Dosimeters (CaSO₄: Dy and LiF:Mg,Ti) for Environmental Assessment of H*(10) in Field Studies.

Teresa Cristina Cavalcanti Soares; Linda V. E. Caldas; V. P. Campos; L. L. Campos

doi:10.15392/2319-0612.2025.2925

Autores/as

Teresa Cristina Cavalcanti Soares IPEN/USP , Instituto de Pesquisas Energéticas e Nucleares
Linda V. E. Caldas Instituto de Pesquisas Energéticas e Nucleares
V. P. Campos Instituto de Pesquisas Energéticas e Nucleares
L. L. Campos Instituto de Pesquisas Energéticas e Nucleares

DOI:

https://doi.org/10.15392/2319-0612.2025.2925

Palabras clave:

dosimetry, thermoluminescence, environmental monitoring, field research

Resumen

The increasing use of ionizing radiation across various sectors of society underscores the need for effective monitoring of occupationally exposed individuals (OEIs), the public, and the environment. Within this framework, environmental radiation protection programs adopt the ambient dose equivalent H*(10) as the operational quantity, as defined by the International Commission on Radiological Protection (ICRP) and recommended by the International Atomic Energy Agency (IAEA), due to its suitability for estimating the risk of external exposure under field conditions. This study assessed the ambient dose equivalent H*(10) through a field survey conducted around the perimeter of the IPEN facilities. Eight monitoring points were selected near thirteen already existing environmental sampling stations, covering approximately 60% of the area. The monitoring was structured in three stages: (i) a comparative analysis between monthly and quarterly measurements using CaSO₄:Dy thermoluminescent detectors (TLDs), which showed proportional responses; (ii) a comparison between quarterly measurements with CaSO₄:Dy and LiF:Mg,Ti TLDs, which demonstrated equivalent results; and (iii) a comparison between the quarterly CaSO₄:Dy data from this study and those obtained in the Environmental Radiological Monitoring Program of the Center for Metrology of Ionizing Radiations of IPEN (ERMP/CEMRI-IPEN), which indicated consistent and satisfactory results, confirming the reliability of using H*(10) in the applied monitoring system. Statistical and uncertainty analyses further confirmed the robustness of the environmental monitoring with thermoluminescent dosimeters. Proper detector selection remains essential to ensure accuracy, minimize variability, and enhance environmental radiation monitoring programs.

Descargas

Los datos de descarga aún no están disponibles.

Referencias

[1] ICRP, INTERNATIONAL COMMISSION ON RADIATION PROTECTION. ICRP Publication 26. 1977 Recommendations of the International Commission on Radiological Protection. Annals of the ICRP, v. 1, n. 3, Pergamon Press, Oxford, 1977.

[2] ICRP, INTERNATIONAL COMMISSION ON RADIATION PROTECTION. ICRP Publication 60, 1990 Recommendations of the International Commission on Radiological Protection, Bethesda,1990.

[3] ICRP, INTERNATIONAL COMMISSION ON RADIATION PROTECTION. ICRP Publication 103, Recommendations of the International Commission on Radiological Protection. ICRP Publication 103, Bethesda, 2011.

[4] ICRP – INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION. Compendium of Dose Coefficients based on ICRP Publication 60. ICRP Publication 119. Annals of the ICRP, v. 41, suplemento, 2012. DOI: https://doi.org/10.1016/j.icrp.2012.06.038

[5] ICRP – INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION. Protection of the Environment under different Exposure Situations. ICRP Publication 124. Annals of the ICRP, v. 43, n. 1, 2014. DOI: https://doi.org/10.1177/0146645313497456

[6] ICRP – INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION. Radiological Protection of People and the Environment in the Event of a Large Nuclear Accident (update of Publications 109 & 111). ICRP Publication 146. Annals of the ICRP, v. 49, n. 4, 2020. DOI: https://doi.org/10.1177/0146645320952659

[7] IAEA - INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA). Radiation Protection of the Public and the Environment. Safety Guide GSG-8. Vienna: IAEA, 2018.

[8] IAEA - NTERNATIONAL ATOMIC ENERGY AGENCY (IAEA). Regulatory Control of Radioactive Discharges to the Environment. Safety Guide GSG-9. Vienna: IAEA, 2018.

[9] IAEA - INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA). Prospective Radiological Environmental Impact Assessment for Facilities and Activities. Safety Guide GSG-10. Vienna: IAEA, 2018.

[10] CNEN, COMISSÃO NACIONAL DE ENERGIA NUCLEAR. NN 3.01: “Requisitos Básicos de Radioproteção e Segurança Radiológica de Fontes de Radiação”. Rio de Janeiro, 2024.

[11] IPEN, INSTITUTO DE PESQUISAS ENERGÉTICAS E NUCLEARES, Laboratório de Radiometria Ambiental, Relatório de avaliação do Programa de Monitoração Radiológica Ambiental, São Paulo, 2021

[12] ICRU, INTERNATIONAL COMMISSION ON RADIATION UNITS - ICRU Publication 85. Fundamental Quantities and Units for Ionizing Radiation. ICRU 85, Journal of the ICRU, 2011.

[13] CAMPOS, L. L. Termoluminescência de materiais e sua aplicação em dosimetria da radiação. Cerâmica [online]. 1998, v. 44, n. 290, p. 244-251. disponível em: <https://doi.org/10.1590/s0366-69131998000600007>. DOI: https://doi.org/10.1590/S0366-69131998000600007

[14] ALMEIDA FILHO, F. A.; CAMPOS, L. L., Dosimetry as a qualification and protection factor in the veterinary area - original text. Revista Científica de Medicina Veterinária - ISSN 1679-7353 Ano XVII – n. 34 – janeiro de 2020 – Periódico Semestral.

[15] SILVA, A. M. B.; SOUZA, L. F.; ANTONIO, P. L.; JUNOT, D. O.; CALDAS, L. V. E.; SOUZA, D. N. Effects of manganese and terbium on the dosimetric properties of CaSO4. Radiation Physics and Chemistry, v. 198, p. 110207, 2022. DOI: https://doi.org/10.1016/j.radphyschem.2022.110207

[16] IEC, INTERNATIONAL ELECTROTECHNICAL COMMISSION. Radiation protection instrumentation dosimetry systems with integrating passive detectors for individual, workplace and environmental monitoring of photon and beta radiation. Geneva: IEC; IEC 62387; 2020.

[17] HARSHAW-BICRON. Model 4500 TLD Workstation Operator’s “Manual”, Publication Nº 4500-0-0-0598-002, Saint-Gobain Industrial Ceramics, Ohio, USA, 1998.

[18] HARSHAW-BICRON, Radiation Measurement Products, Operator’s Manual, model 5500 automatic TLD Reader. Publication no. 5500-0-0-0399-001. Saint Gobain Industrial Ceramics Corporation, Ohio, USA, 1999.

[19] KODAMA, Y.; MANZOLI, J.E.; RELA, P.R. TLD area monitoring on the small size industrial irradiator facility. International Nuclear Atlantic Conference (INAC), 2014.

[20] MONTEIRO, I. H. T. S. Determination of environmental and occupational gamma dose rates resulting from the presence of RDS-111 and the radioactive waste repository at IEN/CNEN. 2005. Dissertation (Master’s Degree) – Federal University of Rio de Janeiro, RJ, Brazil.

[21] NUNES, M.G; CAMPOS, L.L. Study of CaSO4:Dy and LiF:Mg,Ti detectors TL response to electron radiation using a SW Solid Water phantom. Radiation Measurements, v.43, p. 459-462, 2008. DOI: https://doi.org/10.1016/j.radmeas.2007.11.008

[22] CHOI, J. O.; NAM, G. H.; KIM, B. J. A thought on uncertainty evaluation using ANOVA. Accreditation and Quality Assurance, v. 20, p. 335-341, 2015. DOI: 10.1007/s00769-015-1172-x. DOI: https://doi.org/10.1007/s00769-015-1172-x

[23] JCGM - JOINT COMMITTEE FOR GUIDES IN METROLOGY. Evaluation of Measurement Data — Guide to the Expression of Uncertainty in Measurement (GUM). JCGM 100:2008. Sèvres: Joint Committee for Guides in Metrology, 2008. Disponível em: https://www.bipm.org/documents/20126/2071204/JCGM_100_2008_E.pdf.

[24] FARRANCE, I.; FRENKEL, R. Uncertainty of Measurement: A Review of the Rules for GUM. Journal of Research of the National Institute of Standards and Technology, v. 117, p. 95-109, 2012. DOI: 10.6028/jres.117.004. DOI: https://doi.org/10.6028/jres.117.004

[25] EURACHEM/CITAC. Quantifying Uncertainty in Analytical Measurement (QUAM:2012.P1). 3. ed. Teddington: Eurachem, 2012. Disponível em: https://www.eurachem.org/images/stories/Guides/pdf/QUAM2012_P1.

[26] IAEA - INTERNATIONAL ATOMIC ENERGY AGENCY. Quantifying Uncertainty in Nuclear Analytical Measurements. IAEA TECDOC-1401. Vienna: IAEA; 2015. Available from: https://www-pub.iaea.org/MTCD/Publications/PDF/te_1401_web.

[27] INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. ISO 4037-1:2019. Radiological Protection — X and Gamma Reference Radiation for Calibrating Dosemeters and Doserate Meters. Part 1: Radiation characteristics and production methods. Geneva: ISO, 2019.