RESUMEN
Air activity concentrations of (7)Be in Palermo determined for the period January 1995-December 2002 by gamma-ray spectrometric analysis of particulate samples collected on paper filter by a high-volume sampler (approximately 900 m(3) h(-1)) are reported. The temporal behaviour of (7)Be concentration presents the same characteristics already observed in the measurements carried out over the previous 13-year (1982-1994) investigated period. The mean value of 5.06 mBq m(-3) obtained from the analysis of the 4636 particulate samples collected from 1982 to 2002 can be considered a representative value of (7)Be air concentration at ground level in our geographical zone. The comparison of long-term variation in the (7)Be concentrations with the cyclic solar activity-extended to the whole period of 21 years-confirms the inverse correlation between the two quantities.
Asunto(s)
Berilio/análisis , Radiación Cósmica , Radioisótopos/análisis , Monitoreo del Ambiente/historia , Historia del Siglo XX , Italia , Espectrometría gammaRESUMEN
A system for low-energy photon spectrometry using a planar germanium detector with appropriate specifications is presented. A spectrometric background investigation has been carried out with various detector shielding arrangements. The characteristics of the system for measurements of 210Pb in air-particulate matter on filters have been determined.
Asunto(s)
Absorciometría de Fotón/instrumentación , Absorciometría de Fotón/métodos , Contaminantes Atmosféricos/análisis , Exposición a Riesgos Ambientales/análisis , Radioisótopos de Plomo/análisis , Monitoreo de Radiación/métodos , Algoritmos , Germanio , Dosis de Radiación , Monitoreo de Radiación/instrumentaciónRESUMEN
210Pb activity concentrations in the air of Palermo were determined by gamma-ray spectrometric analysis of 323 particulate samples collected in the period September 1995-December 1996. For each sample, the air filtered through a cellulose filter paper was 8600 m3 on average. The values of the daily activity concentration of 210Pb were ranging from 136 to 3390 microBq/m3.