Radiation field distribution within the room for three commonly-used interventional procedures

Objective To detect the radiation field distribution within the room for three commonly-used interventional procedures,in order to provide basic data for the radiation protection and safe operation of staff involved in interventional radiology.Methods The thermoluminescent dosemeters (TLDs) were placed in different points on the horizontal plane around the interventional table and the vertical plane where the staff often stayed.Based on the selected experimental conditions,the TLDs were grouped to be irradiated.After the experiment,the TLDs were measured in the laboratory to calculate the doses of radiation field.Results Data obtained at the same position followed basically as cardiovascular intervention ＞ cerebrovascular intervention ＞ liver intervention.Intervention of same type at the same position followed as high-dose group ＞ mid-dose group ＞ low-dose group.These results were consistent with the useful beam doses,and proportional to the fluoroscopy time.A few data with exception were due to measurement error or experimental error.Conclusions Cerebrovascular and liver interventional procedures resulted in the relatively low radiation doses.The radiation doses at the distance of more than 3 m can be negligible.For cardiovascular interventional procedure,with the decrease of the distance from the X-ray tube,the dose decreased.In the radiation field,the operator,the first assistant and second assistant would exposed to higher dose on the standing points while patients receive lower doses in the head and feet direction. Key words: Interventional procedure; Radiation field; Dose