3 research outputs found

    Construction of radon chamber to expose active and passive detectors

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    In this research and development, we present the design and manufacture of a radon chamber (PUCP radon chamber), a necessary tool for the calibration of passive detectors, verification of the operation of active radon monitors as well as diffusion chamber calibration used in radon measurements in air, and soils. The first chapter is an introduction to describe radon gas and national levels of radon concentration given by many organizations. Parameters that influence the calibration factor of the LR 115 type 2 film detector are studied, such as the energy window, critical angle, and effective volumes. Those are strongly related to the etching processes and counting of tracks all seen from a semi-empirical approach studied in the second chapter. The third chapter presents a review of some radon chambers that have been reported in the literature, based on their size and mode of operation as well as the radon source they use. The design and construction of the radon chamber are presented, use of uranium ore (autunite) as a chamber source is also discussed. In chapter fourth, radon chamber characterization is presented through leakage lambda, homogeneity of radon concentration, regimes-operation modes, and the saturation concentrations that can be reached. Procedures and methodology used in this work are contained in the fifth chapter and also some uses and applications of the PUCP radon chamber are presented; the calibration of cylindrical metallic diffusion chamber based on CR-39 chips detectors taking into account overlapping effect; transmission factors of gaps and pinhole for the same diffusion chambers are determined; permeability of glass fiber filter for 222Rn is obtained after reach equilibrium through Ramachandran model and taking into account a partition function as the rate of track density. The results of this research have been published in indexed journals. Finally, the conclusion and recommendations that reflect the fulfillment aims of this thesis are presented

    Monitoreo de Rad贸n 222 en la zona sur de Lima

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    Existen diversos estudios de las concentraciones de Rad贸n 222 [36], los cuales comenzaron en minas, el objetivo de este tipo de estudios era determinar la dosis a la que estaban expuestos los trabajadores por diversas fuentes naturales entre ellas el Rad贸n, las concentraciones de Rad贸n 222 encontradas fueron muy elevadas llegando a la conclusi贸n que las hijas del Rad贸n 222 son las mas nocivas adicion谩ndose a los efectos que causa el fumar, dado que el Rad贸n 222 es un gas exhalado por el suelo y por tanto se encuentra en forma natural en la atm贸sfera cobra enorme importancia medir las concentraciones de Rad贸n 222 en las viviendas y lugares de trabajo en el cual las personas pasamos la mayor parte de nuestras vidas. En este trabajo se muestra resultados de mediciones de Rad贸n 222 en interiores (viviendas) de la zona sur de Lima (principalmente en el distrito de Villa el Salvador) y se analiza los resultados encontrados, as铆 mismo la data encontrada ser谩 incluida en la elaboraci贸n del mapa de Rad贸n 222 de Lima-Metropolitana. En la actualidad se acepta que la inhalaci贸n de los productos de decaimiento del Rad贸n 222 incrementa la incidencia de c谩ncer al pulm贸n, estas observaciones han sido estudiadas por diversas organizaciones como la OMS (Organizaci贸n Mundial de la Salud) [32], ICRP (seg煤n sus siglas en ingl茅s, Internacional Commission Radiological Protection )[19]. Si bien es cierto, el inter茅s en esta fuente de radiaci贸n natural inicio en pa铆ses desarrollados, actualmente un importante n煤mero de estudios se han desarrollado para evaluar los niveles de Rad贸n 222 y el Rad贸n 220 en casas y 谩reas con un potencial alto de riesgo a la exposici贸n a este gas radiactivo. En nuestro pa铆s recientemente se ha iniciado este tipo de estudios pero a煤n es insuficiente, este trabajo pretende contribuir con la determinaci贸n y estudio de los niveles de Rad贸n 222 en viviendas en la zona sur de la ciudad de Lima, teniendo en cuenta las condiciones atmosf茅ricas, el tipo de suelo, los materiales de construcci贸n utilizados son par谩metros que influyen en la medici贸n, la concentraci贸n del Rad贸n 222 y sus productos de decaimiento en la atm贸sfera del interior de las viviendas. Se encuentra que la velocidad con la que entra y sale el aire de una casa es un par谩metro determinante, siendo la ventilaci贸n una de las formas m谩s efectivas de reducir las concentraciones del Rad贸n 222 en una vivienda habitada.Tesi

    Estimation of Indoor 222Rn Concentration in Lima, Peru Using LR-115 Nuclear Track Detectors Exposed in Different Modes

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    Radon is the main source of natural radioactivity, and its measurement is considered extremely important in radioprotection, given its relationship with the occurrence of lung cancer. In the last two years, measurements of this radioactive gas were carried out in Lima considering a grid of 5 km (Formula presented.) and the population density to determine the number of measurements to be carried out. Cellulose nitrate nuclear track detectors exposed in bare mode and diffusion chamber mode were used to estimate (Formula presented.) Rn concentrations. In diffusion chamber mode, non-commercial monitors and commercial monitors were used. The monitoring results are presented for 43 districts of the Lima Province whose population is approximately ten million inhabitants occupying a total area of 2655.15 km (Formula presented.). Measurements were made obtaining an average concentration of 49 Bq路m (Formula presented.) using bare detectors and 66 Bq路m (Formula presented.) using non-commercial diffusion chambers. Average concentrations obtained by both detector exposure modes were below the maximum concentration recommended by the WHO. A radon ((Formula presented.) Rn) map was also obtained as a visual representation of the (Formula presented.) Rn levels in the Lima province using inverse distance weighting (IDW) interpolation
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