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26 results on '"Peralta, Luís"'

1. Radioactivity in a bucket

Author

Peralta, Luis

Subjects
Physics - Physics Education
Abstract

In Radiation Physics classes, point sources are typically used, for which it is relatively easy to describe the signal obtained by a radiation detector, such as the NaI(Tl) scintillation detector. The use of large extended radiation sources is generally avoided due to the mathematical complexity that their description may involve. However, the use of Monte Carlo simulation methods allows this limitation to be overcome. Potassium chloride, containing the 40K isotope, is an ideal candidate for carrying out this type of experiment. The source activity is obtained through the detection of the 1460.8 keV gamma-photon emitted in the 40K decay. In the first experiment, a cylindrical container is used, placing the NaI(Tl) detector in its center and filling the remaining space with potassium chloride. In a second, more complex case, a large radioactive source consisting of a container filled with a mixture of sand and potassium chloride, with the NaI(Tl) detector placed in the center of the mixture, is used. In this case, the mass of potassium chloride is approximately 1/5 of the sand mass. In both experiments, the detection efficiency is obtained by Monte Carlo simulation. A careful analysis of the experimental data allows to obtain a good agreement between the measured and calculated value of the activity., Comment: 9 pages, 5 figures, 6 tables

Published
2023
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21. Mayor presupuesto no genera celeridad procesal y plazo razonable en el Tribunal Constitucional, Perú 1999-2020.

Author

Flores Arocutipa, Javier Pedro, Jinchuña Huallpa, Jorge, Bermejo Peralta, Luís Delfín, Cohaila Quispe, Ruth Daysi, and Coayla Quispe, Karen

Subjects
BUDGET, PUBLIC administration, DISCRIMINANT analysis, CONSTITUTIONAL courts, CLUSTER analysis (Statistics)
Abstract

Copyright of Cuestiones Políticas is the property of Revista Cuestiones Politicas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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23. Prueba indiciaria en el delito de Hurto con agravantes en la justicia peruana.

Author

Flores Arocutipa, Javier Pedro, Jinchuña Huallpa, Jorge, Bermejo Peralta, Luís Delfín, Apaza Jilaja, Elizabeth Virginia, and Machaca Mamani, Julio César

Subjects
SUPERIOR courts, DATABASES, ROBBERY, CRIME, NUMERALS
Abstract

Copyright of Cuestiones Políticas is the property of Revista Cuestiones Politicas and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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25. Human exposure to indoor radon: a survey in the region of Guarda, Portugal.

Author

Louro, Alina, Peralta, Luís, Soares, Sandra, Pereira, Alcides, Cunha, Gilda, Belchior, Ana, Ferreira, Luís, Monteiro Gil, Octávia, Louro, Henriqueta, Pinto, Paulo, Rodrigues, António Sebastião, Silva, Maria João, and Teles, Pedro

Subjects
RADIATION exposure, RADIATION protection, RADON, CARCINOGENS, RADIOACTIVE substances
Abstract

Radon (222Rn) is a radioactive gas, abundant in granitic areas, such as the city of Guarda at the northeast of Portugal. This gas is recognised as a carcinogenic agent, being appointed by the World Health Organization as the second leading cause of lung cancer after tobacco smoke. Therefore, the knowledge of radon concentrations inside the houses (where people stay longer) is important from the point of view of radiological protection. The main goal of this study was to assess the radon concentration in an area previously identified with a potentially high level of residential radon. The radon concentration was measured using CR-39 detectors, exposed for a period of 2 months in 185 dwellings in the Guarda region. The radon concentration in studied dwellings, ranged between 75 and 7640 Bq m−3, with a geometric mean of 640 Bq m−3 and an arithmetic mean of 1078 Bq m−3. Based on a local winter–summer radon concentration variation model, these values would correspond to an annual average concentration of 860 Bq m−3. Several factors contribute to this large dispersion, the main one being the exact location of housing construction in relation to the geochemical nature of the soil and others the predominant building material and ventilation. Based on the obtained results an average annual effective dose of 15 mSv y−1 is estimated, well above the average previously estimated for Portugal. [ABSTRACT FROM AUTHOR]

Published
2013
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