Revisiting Natural Radiation in Itacaré and Guarapari Beaches
Journal Title: Journal of Nuclear Physics, Material Sciences, Radiation and Applications - Year 2016, Vol 4, Issue 1
Abstract
Human beings are constantly exposed to several types of natural radiation. This paper aims to study the total external dose from northwestern Brazilian beach sands. The samples were collected at Prainha in Itacaré, Bahia, and Praia de AreiaPreta in Guarapari, Espírito Santo. Gamma spectrometry is a very useful technique to estimate the effective dose due to naturally occurring radionuclides, such as 40K and daughters of 238U and 232Th. In order to confirm the high activity present in these two regions, the effective dose due to each natural radionuclide was determined. Moreover, the Energy-Dispersive X-Ray Spectroscopy (EDS) microanalysis was used to characterize the soil composition and the minerals responsible for the high activity. In addition, the sand samples were separated in to magnetic and non-magnetic fractions in order to identify the contribution from each portion of the activity. Finally, the radionuclides and their dispersion in those places are consistent with previous studies, indicating effective doses above the world average that is between 0.3 mSv/year and 1.0 mSv/year.
Authors and Affiliations
M. A. G. Silveira, J. M. Oliveira, V. A. P. Aguiar, N. H. Medina
Keywords
Related Articles
- EP ID EP595476
- DOI 10.15415/jnp.2016.41001
- Views 216
- Downloads 0
Characterization Of Structures Of Equivalent Tissue With a Pixel Detector
Research using hybrid pixel detectors in medical physics is on the rise. Timepix detectors have arrays of 256 × 256 pixels with a resolution of 55 µm. Here, and by using Timepix counts instead of Hounsfield units, we pre...
Energy Dependence of Parameters Characterizing Multiply Backscattering of Gamma Photons
The present studies aimed to investigate the effects of energy dependence of parameters characterizing multiply backscattering of gamma photons. The numbers of multiply backscattered events are found to be increasing wit...
X-Ray Fluorescence Analysis of Fine Atmospheric Aerosols from a Site in Mexico City
A study was performed in the Winter of the year 2015 in a Southwestern site in the MAMC (Ciudad Universitaria), collecting PM2.5 samples with a MiniVol. As a part of wider study focused to fully characterize aerosols at...
Quantum Effects on the Linear Dispersion Characteristics in Electron-Positron Plasma
In electron-positron plasmas some of the plasma modes are decoupled due to the equal charge to mass ratio of both species. The dispersion properties of the propagation of linear waves in degenerate electron–positron magn...
Annihilation of Dipolar Dark Matter: χχ→γγ
In this work we study the annihilation of dark matter, considering it as a neutral particle with magnetic and/or electric moments not null. The calculation of the effective section of the process χχbar→γγ → is made start...