Radiation Protection Dosimetry · 1996 · 11 citations · 0 references
EngineeringNuclear EngineeringNuclear MedicineRadiation DosimetryRadiation MeasurementRadiation ProtectionBackground Radiation MeasurementPatient MonitoringRadiation Dose MeasurementRadiation Monitoring SystemsRadiation Protection PrinciplesRadiation Risk AssessmentMedical Radiation Exposure MonitoringPassive Radiation MonitorsRadiation Dose MonitoringRadiation Protection MonitoringRadon Background MeasurementRadon MeasurementRadon MonitoringRadon Tracing
To facilitate the accurate continuous measurement of radon in the atmosphere, a two-filter radon monitor was developed. Short term variations in radon concentration were monitored with a silicon semiconductor detector sensitive to 218Po alpha particles. The deposition of radon progeny on the internal surface of the cylindrical vessel was investigated using Gormley and Kennedy's formula as well as Ingham's formula. Comparing the experimental results with the predicted values, Ingham's formula was found to provide better agreement. The influence of absolute humidity on the sensitivity of the monitor was also investigated. It was found to have little influence in the range of 11-27 g.m-3 (22-29o, 40-90%). The minimum detectable concentration of the monitor is 2.7 Bq.m-3 for a 30 min counting interval. As this instrument is stable over long periods, it is suitable for determining very low radon concentrations in the natural environment.