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Measurements of radon (222Rn, 220Rn) and progeny concentration in air using LR-115 detectors in diffusion chamber: design, construction and self-calibration. Semi-empirical method to determine gamma activities in environmental samples

Grant number: 13/13238-5
Support Opportunities:Research Grants - Visiting Researcher Grant - International
Start date: January 01, 2014
End date: December 31, 2014
Field of knowledge:Physical Sciences and Mathematics - Physics - Nuclear Physics
Principal Investigator:Elisabeth Mateus Yoshimura
Grantee:Elisabeth Mateus Yoshimura
Visiting researcher: Daniel Francisco Palacios Fernandez
Visiting researcher institution: Universidad Simón Bolívar (USB), Venezuela
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Through the analysis of some track features induced in etched detectors as their spatial distributions, angles of incidence, geometric parameters and overlapping, the response of LR-115 detectors inside diffusion chambers (type cup monitors) is evaluated. An attempt will be made to correlate these characteristics with the geometry of diffusion chambers and detector location. The constancy of detector efficiency will be evaluated. The quality of radon concentration measurements will be evaluated based on criteria of reliability, accuracy and precision of results. Experiments will be conducted to relate the geometric track parameters with incident angles and energies. Based on experimental results of track parameters and their distributions, or with the use of alternative procedures, the ability to individually calibrate (auto-calibration) LR-115 detectors will be evaluated. From the theoretical basis of the response of LR-115 detectors facing hemispherical surfaces, it is expected to design and build a device to measure the airborne concentrations of radon, thoron and their a-emitter progenies. These studies will increase knowledge about the performance of LR-115 detectors in diffusion chambers, which in principle can be extended to other types of detectors in different geometric configurations. It is proposed to evaluate a semi-empirical alternative method to calculate the radionuclide concentrations in environmental samples using high-resolution gamma spectroscopy. Publications and projects with professors and students are planned, as well as teaching a postgraduate course. It is expected to propose collaborative projects between the involved institutions, Brazil and Venezuela. (AU)

Articles published in Agência FAPESP Newsletter about the research grant:
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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)
PALACIOS FERNANDEZ, DANIEL; PALACIOS, FRANCISCO; YUSHIMURA, ELISABETH M.; PALACIOS, GUILLERMO; DA SILVA, ALMY A. R.. Digital holographic microscopy for recording and analysis of 3D images of etched tracks in LR-115 SSNTD. Journal of Radioanalytical and Nuclear Chemistry, v. 307, n. 1, p. 793-799, . (13/13238-5)
PEREYRA, PATRIZIA; PALACIOS, DANIEL; YOSHIMURA, ELISABETH MATEUS; SAJO-BOHUS, LASZLO. Monte Carlo simulation of a simple and fast method to experimentally determine the partial sensitivity of a bare LR-115 detector using planar alpha sources. Radiation Measurements, v. 165, p. 9-pg., . (13/13238-5)
PALACIOS FERNANDEZ, DANIEL; FUSELLA, EMIDIO; AVILA, YININBER; SALAS, JHONNY; TEIXEIRA, DIANA; FERNANDEZ, GUILLERMO; SAJO-BOHUS, LASZLO; GREAVES, EDUARDO; BARROS, HAYDN; BOLIVAR, MANUEL; et al. Soil gas radon and thoron measurements in some Venezuelan oilfields. Journal of Radioanalytical and Nuclear Chemistry, v. 307, n. 1, p. 801-810, . (13/13238-5)
PALACIOS FERNANDEZ, DANIEL; FUSELLA, EMIDIO; AVILA, YININBER; SALAS, JHONNY; TEIXEIRA, DIANA; FERNANDEZ, GUILLERMO; SAJO-BOHUS, LASZLO; GREAVES, EDUARDO; BARROS, HAYDN; BOLIVAR, MANUEL; et al. Soil gas radon and thoron measurements in some Venezuelan oilfields. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, v. 307, n. 1, p. 10-pg., . (13/13238-5)
PALACIOS FERNANDEZ, DANIEL; PALACIOS, FRANCISCO; YUSHIMURA, ELISABETH M.; PALACIOS, GUILLERMO; DA SILVA, ALMY A. R.. Digital holographic microscopy for recording and analysis of 3D images of etched tracks in LR-115 SSNTD. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, v. 307, n. 1, p. 7-pg., . (13/13238-5)