RESUMEN
Measurements of activity concentration of radon gas and radon decay products were carried out in several workplaces including schools, radium spas, swimming pools, water treatment plants, caves and former mines. Based on these measurements, annual effective doses to workers were estimated and values of the equilibrium factor, F, were calculated. This paper describes the different approaches used to estimate the annual effective dose based on the dose coefficients recommended by the International Commission on Radiological Protection. Using the measured F values as opposed to the default F value of 0.4 changed the doses by about 5-95% depending mainly upon the ventilation conditions of the workplace.
Asunto(s)
Contaminantes Radiactivos del Aire , Exposición Profesional , Monitoreo de Radiación , Radón , Contaminantes Radiactivos del Aire/análisis , Humanos , Exposición Profesional/análisis , Radón/análisis , Hijas del Radón , Lugar de TrabajoRESUMEN
The knowledge of the behaviour of radioactive aerosol particles in the uranium mine atmosphere is very important due to the evaluation of the effective dose for uranium miners. During the research of the project SUJ200402-'Study of behaviour of natural long-lived radionuclides in the mine atmosphere', several measurement campaigns were performed in the last active Central Europe uranium mine Rozna I. The main purpose of this paper is characterisation the radionuclides which creating the main part of the airborne radioactivity in the uranium mine atmosphere. The present paper introduces results of the measurements of airborne radioactivity in stopes of the uranium mine Rozna I. The measurements were performed at the 21st floor at a depth of â¼1100 m under the ground. In addition to the concentration of (222)Rn, its progenies, long-lived radionuclides and also the concentration of aerosol particles were measured.
Asunto(s)
Contaminantes Ocupacionales del Aire/análisis , Contaminantes Radiactivos del Aire/análisis , Monitoreo del Ambiente , Minería , Monitoreo de Radiación , Uranio/análisis , Aerosoles , República Checa , Polvo/análisis , Humanos , Radón/análisisRESUMEN
The Authorized Metrological Centre (AMS) working by SUJCHBO (National Institute for Nuclear, Chemical and Biological Protection) ensures for the Czech Republic the metrological traceability for devices that measure the radon concentration and the energy equivalent radon concentration connected with the radon decay products (RnDP). The evaluation and the calibration of measuring devices for radon and RnDP require the stable conditions (first of all radon and the RnDP concentrations). The new AMS radon-aerosol chamber in Kamenná consists of the walk-in testing chamber with a volume of 10 m(3) and of the handling box with a volume of 0.3 m(3). The design of the chamber allows measurement and a control of environmental parameters such as the temperature, the pressure of air inside and outside of the chamber, the relative humidity of air, the concentration and the size distribution of aerosol particles and the air velocity.
Asunto(s)
Contaminantes Radiactivos del Aire/análisis , Monitoreo de Radiación/instrumentación , Radón/análisis , Calibración , República Checa , HumanosRESUMEN
The determination of the outdoor concentration of radon and its decay products in the lower layers of the atmosphere is not easy, because of the fact that their concentrations there are very low and, therefore, it is necessary to use low levels of background detection equipment. Our usual methods were modified and a level of several Becquerels per cubic meter was then measured.
Asunto(s)
Aire/análisis , Monitoreo de Radiación/instrumentación , Radón/análisis , Diseño de Equipo , Monitoreo de Radiación/métodosRESUMEN
It is a little surprising, but radon has been measured by our Institute for >50 y. In the first phase this was carried out in underground mines (up to the present day) but more and more attention has been paid to domestic dwellings and NORM workplaces. The number of the measurements (grab sampling underground, SSNTDs application) was relatively high. To the routine work of the Institute is added research and calibration for radon measuring organisations. Since the formation of the Czech Republic, our previous institution was reformed by the State Office for Nuclear Safety and is one of the two organisations whose main task is, among others, radon measurement.