RESUMO
Resumen El Centro de Protección e Higiene de las Radiaciones fue fundado en 1985 para sustentar la aplicación segura de las tecnologías nucleares en Cuba. En la actualidad la institución es considerada como una referencia nacional y regional en materia de seguridad radiológica, gracias a una sólida estrategia institucional que aporta de manera sostenida soluciones a problemas prioritarios del país. Este trabajo presenta una reseña de los principales resultados del centro hasta la fecha.
Abstract The Center for Radiation Protection and Hygiene was founded in 1985 to support the safe application of nuclear technologies in Cuba. Nowdays, the institution is considered as a national and regional reference for radiation protection , thanks to the comprehensive institutional strategy that support the solutions of the problems with priority in the country. The paper presents the overview about the main results of the center up today.
RESUMO
The results for the comparison of Hp(0.07,0°) in 90Sr/90Y, carried out by the SSDL-ININ (pilot) and CPHR, are presented. Four calibration curves (CCs) are constructed with 32 TLD-200 dosimeters irradiated on a PMMA phantom. The CCs, TLD's Response RTLD (nC) vs Hp(0.07,0°), are in the range 0.2-100 mSv. The SSDL-ININ rate Hp(0.07, 0°) value is (43.85 ± 0.57) µSv s-1 obtained with a primary extrapolation chamber serial 040. These same dosimeters are irradiated at the CPHR with a rate of Hp(0.07, 0°) = (14.94 ± 0.36) µSv s-1, also calibrated with another primary standard extrapolation chamber serial 105. After irradiation at CPHR, the dosimeters are returned to the SSDL-ININ for reading, and then irradiated again to construct the fourth CC (CC4). The comparison is based on a modification of the standard ANSI/HPS N13.11-2009, where the reference values are [Hp]ININ,ref. For the values of [Hp]CPHR the statistics bias B = 0.002; standard deviation, S = 0.099; and tolerance level L = 0.099 are determined. The homoscedasticity test is performed for the variances associated to the mean performance quotientB.
Assuntos
Partículas beta , Dosímetros de Radiação , Calibragem , Humanos , Valores de Referência , Radioisótopos de EstrôncioRESUMO
RESUMEN La detección y la medición de las radiaciones nucleares se han convertido en un importantísimo renglón en la aplicación de los detectores nucleares y específicamente los Geiger-Muller. Los tubos Geiger con una alta sensibilidad de detección, su robusta construcción y un simple circuito adjunto continúan siendo uno de los detectores más usados en todas las áreas de aplicación en la física e investigaciones nucleares. Se presenta un nuevo diseño de instrumento para medir la tasa de dosis externa ambiental de radiación gamma desde 0,05 µSv/h hasta 10 mSv/h. Consta de tres elementos fundamentales: el detector Geiger-Muller, una tarjeta electrónica de adquisición y control y el software de aplicación. El instrumento se comunica a través de una interfase USB con la computadora solo para variar y ajustar los parámetros de la calibración. El software sedesarrolló en lenguaje C utilizando el compilador PICC4.08.
ABSTRACT The detection and measurement of nuclear radiation have turn into an important aspect in the application of nuclear detectors and specifically, the Geiger Muller tubes. Endowed with high detection sensibility, robust construction and a relative simplicity of the associated circuit, the Geiger Tubes are still one of the most widely used detectors in all areas of application in physics and nuclear research. A new design of the instrument enables measurements of the environmental external dose rate of g (gamma) radiation from 0.05 µSv/h to 10 mSv/h. It consists of three elements: Geiger-Muller detector, a data acquisition and control card and the application software. The instrument is connected to the computer through a USB interface only to vary and adjust the calibration parameters. The software was developed in C programming language using the PICC4.08 compiler.
