Um Sistema para Monitoração do Radônio e seus Produtos de Decaimento na Atmosfera

Abstract

A device to simultaneously measure the radon content of the atmosphere and its decay products associated with the atmospheric aerosols is described. The radon daughters are continuously precipitated through an electrostatic field onto an alpha particle detector which is also the collecting electrode. Either total counting or spectral analysis can be obtained as output data. The decay products of radon associated to the aerosols are measured in membrane filters after collecting the atmospheric aerosols within a given sampling time interval. The sensitivity of the instrument is better than 0.61 pCi.m³, and the response time to a transient concentration change of radon is better than 20 minutes, in the present configuration.