ABSTRACT
We investigated the effect of air purifier for reducing the indoor radon exposure by continuously measuring the radon (Rn), attached radon decay products (DaRn) and unattached radon decay products (DuRn). The results showed that the air purifier can effectively reduce the concentration of DaRn and DuRn except Rn. The results showed that the air purifier can be a helpful supplement to the existing radon mitigation methods.
Subject(s)
Air Filters , Air Pollutants, Radioactive/isolation & purification , Air Pollution, Indoor/analysis , Radon Daughters/isolation & purification , Radon/isolation & purification , Humans , Radiation Monitoring/methodsABSTRACT
Thorium-227 is currently undergoing evaluation as a potential radionuclide for targeted cancer therapy, and as such a high chemical purity of the material is required. To establish a reliable procedure for radiochemical isolation of 227Th from the parent 227Ac and decay progeny, which includes the radiotherapeutic 223Ra, the performance of three different separation schemes based on ion-exchange and extraction chromatography have been evaluated. The results suggest that both ion exchange and extraction chromatographic techniques can be successfully used for the separation of 227Th from its decay progeny, however extraction chromatographic resins demonstrate favourable performance in terms of Th recovery and purification from radionuclide impurities.
Subject(s)
Chromatography, Ion Exchange/methods , Radiopharmaceuticals/isolation & purification , Thorium/isolation & purification , Actinium/isolation & purification , Alpha Particles , Germanium , Humans , Ion Exchange Resins , Radon Daughters/isolation & purification , Spectrometry, Gamma , Spectrophotometry, AtomicABSTRACT
Measuring of radon and thoron progeny concentrations in air, based on air filtration, was analysed in order to assess the reliability of the method. Changes of radon and thoron progeny activities on the filter during and after air sampling were investigated. Simulation experiments were performed involving realistic measuring parameters. The sensitivity of results (radon and thoron concentrations in air) to the variations of alpha counting in three and five intervals was studied. The concentration of (218)Po showed up to be the most sensitive to these changes, as was expected because of its short half-life. The well-known method for measuring of progeny concentrations based on air filtration is rather unreliable and obtaining unrealistic or incorrect results appears to be quite possible. A simple method for quick estimation of radon potential alpha energy concentration (PAEC), based on measurements of alpha activity in a saturation regime, was proposed. Thoron PAEC can be determined from the saturation activity on the filter, through beta or alpha measurements.
Subject(s)
Air Pollutants, Radioactive/analysis , Air/analysis , Filtration/methods , Models, Chemical , Radiation Monitoring/methods , Radon Daughters/analysis , Air Pollutants, Radioactive/isolation & purification , Algorithms , Computer Simulation , Half-Life , Models, Statistical , Radon Daughters/isolation & purification , Reproducibility of Results , Sensitivity and SpecificityABSTRACT
Radiometers for measurements of radon daughter potential energy used in the surveillance of the work environment need a systematic calibration. This paper presents how a commercially available device produced by the Pylon Company can be applied. This device allows to produce, simply and directly, standard sources of radon daughters, corresponding with the energy, geometry and properties of radiation originated from an air sample. The calibration yielded the results that proved to be in agreement with those obtained previously by means of radon chamber.
