Disequilibrium estimations in the U and Th series by using thick source alpha-particle spectroscopy

We present a simple, low-cost, and low-power alpha-particle detection system for environmental radioactivity monitoring. The system exploits a previuosly-developed high- resistivity-silicon detector with internal amplification capability based on the bipolar-transistor (BJT) effect and readout electronics based on commercial IC's. Two-dimensional numerical device simulations are adopted to assess the feasibility of the BJT detector as an alpha-particle detector that can be operated, without losing its internal signal amplification capability, with floating base and low collector voltages, so that device technology can be kept simple, very small DC power consumption can be achieved, and a single 5-V power-supply voltage can be used for readout electronics and detector biasing. The charge amplification accomplished by the BJT detector allows a single, commercial chip to be adopted, to perform charge preamplification and 20-bit A/D conversion. The digital output is sent to a low-cost microcontroller that can be periodically interrogated through the IR port. The cost of the readout electronics is in the order of 60$ and it can operate with standard Li-ion battery for about 60 hours.

Application of the BJT detector for simple, low-cost, and low-power alpha-particle detection systems

Simulation and experimental measurement of radon activity using a multichannel silicon-based radiation detector.

Se implemento un sistema de control para una planta multiproposito el cual consta de control de nivel, control de temperatura y control de presion Se desarrollo una interfaz en LabView 91 para una mejor visualizacion de la operacion y se comprobo la correcta interaccion de la interfaz con la planta, consiguiendo llegar a los valores del set-point con un margen de error de hasta un 5% Ademas, se realizo una simulacion en Simulink de MATLAB para el lazo de control de temperatura encontrando una alta concordancia entre los datos experimentales y la simulacion

/pdf/uso-de-labview-para-sistemas-de-control-en-ingenieria-263ox8rujp.pdf

Uso de labview para sistemas de control en ingeniería química

Accuracy testing using thick source alpha-particle spectroscopy for the U and Th series estimations

Terradex project aims to realise an accurate and programmable multiparametric tool which will measure relevant physical quantities such as observation time, energy and type of all decay products of three naturally occurring decay chains of uranium and thorium series present in nature as well as the decay products of man-made radioactivity. The measurements described in this work are based on the performance tests of the first version of an instrument that is designed to provide high counting accuracy, by introducing self-triggering, delayed time-coincidence technique, of products of a given decay chain. In order to qualify the technique and to calibrate the Terradex, a 222Rn source is used. The continuous and accurate monitoring of radon concentration in air is realised by observing the alpha and beta particles produced by the decay of 222Rn and its daughters and tag each of them with a precise occurrence time. The validity of delayed coincident technique by using the state of the art electronics with application of novel data sampling and analysis methods are discussed. The flexibility of sampling protocols and the advantages of online calibration capability to achieve the highest level of precision in natural and man-made radiation measurements are also described.

Multipurpose High Sensitivity Radiation Detector: Terradex

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Multipurpose High Sensitivity Radiation Detector: Terradex