SCATTERED X-RAY ENERGY DATA FROM INTEGRATED MULTI-FILTER PERSONAL DOSEMETERS WORN BY INTERVENTIONAL RADIOLOGY STAFF

摘要

The accuracy and usability of scattered X-ray energy data obtained from multi-filter dosemeters were investigated by comparing the data with results obtained via Monte Carlo simulation. The energy data, which were read from integrated personal dose-meters used by interventional radiology (IR) staff in individual monitoring, were plotted against relative frequency and statistically assessed. The effective energy obtained from the multi-filter dosemeters was inversely proportional to detector size and lower than the results of the Monte Carlo simulation. All distributions of scattered X-ray energy to which the IR staff were exposed had only one peak value, which corresponded with the effective energy measured using a water phantom. For abdominal IR, there was a significant difference in the distributions between IR staff (p ＜ 0.01). The results suggest that rectifying systematic errors resulting from oblique incidence of X-rays against the filters would make the energy data usable for optimisation of radiological protection.