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Determination of a reference system and a routine dosimeter using fototransferred luminescent techniques, for high-dose dosimetry in gamma irradiators

Grant number: 14/12732-9
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): April 01, 2015
Effective date (End): March 31, 2018
Field of knowledge:Engineering - Nuclear Engineering
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Linda Viola Ehlin Caldas
Grantee:Patrícia de Lara Antonio
Home Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil
Associated research grant:10/16437-0 - Characterization and applications of dosimetric materials using optically stimulated luminescence and complementary techniques, AP.TEM

Abstract

The radiation processing has been used worldwide and for several different applications, especially in health, agriculture and industry; for each purpose an absorbed dose interval is used, that may be low, medium and high. The irradiators used with these purposes are called large irradiators, and the sources can be of gamma radiation, electron beams and X-rays. The gamma irradiators are the most used, and they may be of 60Co or 137Cs sources. Luminescent techniques, as thermoluminescence (TL), optically stimulated luminescence (OSL) and thermally stimulated exoelectronic emission (TSEE), have been used in the last years associated to the use of solid state dosimetry. Some materials have already been tested by other researchers for gamma radiation dosimetry, however, usually they present a high signal fading in a short time interval, and lack of linearity of response in a large interval of absorbed dose. For these reasons, the most used materials for gamma radiation dosimetry of large irradiators are imported and commercial ones. The main objective of this work is to determine a reference dosimeter and a routine dosimeter, to be applied for the gamma radiation dosimetry of large irradiators and intense sources, with the essential criteria recommended by the ISO/ASTM 51261 norme, mainly a low signal fading in a large time interval and linearity of response in a large range of absorbed dose. Thus, different materials (commercial and in natural form) will be characterized in relation to their luminescent response using the TL, OSL and TSEE phenomena, when exposed to gamma radiation beams of large irradiators and intense sources. Afterwards, the same materials will be submitted to ultraviolet radiation, which will act as an important and main tool for the fototransferred techniques, and then measurements obtained by the photo-transferred thermoluminescence (PTTL), photo-transferred optically stimulated luminescence (PTOSL) and photo-transferred thermally stimulated exoelectronic emmission (PTTSEE) methods will be studied. The results obtained in this project will be compared with measurements of optical absorbance (AO) of other utilized materials, and then an intercomparison with the routine material in the present dosimetry procedures of the gamma irradiators at the Radiation Technology Center (CTR), IPEN, will be performed. After all these steps, the two dosimeters of reference and routine will be choosen and applied in large irradiators and intense gamma sources of some institutes and centers of technology of Brazil. (AU)

Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SOUZA, LUIZA F.; NOVAIS, ANDREA L. F.; ANTONIO, PATRICIA L.; CALDAS, LINDA V. E.; SOUZA, DIVANIZIA N. Luminescent properties of MgB4O7:Ce,Li to be applied in radiation dosimetry. Radiation Physics and Chemistry, v. 164, NOV 2019. Web of Science Citations: 1.
ANTONIO, PATRICIA L.; OLIVEIRA, RAQUEL A. P.; KHOURY, HELEN J.; CALDAS, LINDA V. E. Evaluation of the thermally and optically stimulated response of an Italian Obsidian irradiated in Co-60 beams. Radiation Physics and Chemistry, v. 155, n. SI, p. 115-120, FEB 2019. Web of Science Citations: 0.
DE OLIVEIRA, LUCAS N.; DO NASCIMENTO, ERIBERTO O.; ANDREETA, MARCELLO R. B.; ANTONIO, PATRICIA L.; CALDAS, LINDA V. E. Characterization of lithium diborate, sodium diborate and commercial soda-lime glass exposed to gamma radiation via linearity analyses. Radiation Physics and Chemistry, v. 155, n. SI, p. 133-137, FEB 2019. Web of Science Citations: 1.
ANTONIO, PATRICIA L.; CALDAS, LINDA V. E. Applying the TSEE technique to Spectrolite and Opal pellets irradiated with high doses of gamma radiation. Radiation Measurements, v. 106, n. SI, p. 538-542, NOV 2017. Web of Science Citations: 1.
POLO, IVON ORAMAS; SANTOS, WILLIAM SOUZA; ANTONIO, PATRICIA DE LARA; CALDAS, LINDA V. E. Variance reduction technique in a beta radiation beam using an extrapolation chamber. Applied Radiation and Isotopes, v. 128, p. 154-157, OCT 2017. Web of Science Citations: 4.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.