RESUMO
Interventional radiology and hemodynamic procedures have rapidly grown in number in the past decade, increasing the importance of personnel dosimetry not only for patients but also for medical staff. The optimization of the absorbed dose during operations is one of the goals that fostered the development of real-time dosimetric systems. Indeed, introducing proper procedure optimization, like correlating dose rate measurements with medical staff position inside the operating room, the absorbed dose could be reduced. Real-time dose measurements would greatly facilitate this task through real-time monitoring and automatic data recording. Besides real-time dose monitoring could allow automatic data recording. In this work, we will describe the calibration and validation of a wireless real-time prototype dosimeter based on a new sensor device (CMOS imager). The validation measurement campaign in clinical conditions has demonstrated the prototype capability of measuring dose-rates with a frequency in the range of few Hz, and an uncertainty smaller than 10%.
Assuntos
Radiologia Intervencionista , Radiometria/métodos , Radiometria/instrumentação , Fatores de Tempo , Tecnologia sem FioRESUMO
After the Chernobyl accident in April 1986 the 134Cs, 137Cs and 40K activity of mushrooms of different genera and their corresponding soils from woods located in the province of Umbria (Italy) was determined. The results indicated: a temporally increasing trend for 137Cs up to a "limit value" depending on local fallout in 1986; different cesium concentrations in various mushroom genera; and uptake of potassium from soil that did not appear to compete with cesium uptake. No reliable correlation can be inferred between the cesium content of the soil and those of mushrooms.
Assuntos
Acidentes , Basidiomycota/química , Radioisótopos de Césio/análise , Reatores Nucleares , Poluentes Radioativos do Solo/análise , Contaminação Radioativa de Alimentos/análise , Itália , Radioisótopos de Potássio/análise , Fatores de Tempo , UcrâniaRESUMO
The 137 Cs content was determined in 406 plant drug samples harvested in 1986 and 1987 after the Chernobyl accident and in their preparations. Very high values were found in drugs produced in Eastern Europe and in Italy. The decoctions contain about 80% of 137Cs present in the drugs.
