DIFFERENCES IN REPORTED BACKSCATTER FACTORS FOR LOW-ENERGY X-RAYS - ALITERATURE STUDY

For low energy x-rays (HVL < 8 nun Al) large differences (up to 10%) i n backscatter factors have been reported between new Monte Carlo calcu lations and old measurements. Minor differences (up to 3%) have been s hown between recent measurements and these calculations. These differe nces have been said to be caused by errors mainly in the measurements. All investigations (old and new) have presented BSF as a function Of HVL. By regarding the x-ray spectra used by the different investigator s the differences are explainable. Even the old BsF-values may be corr ect if, as presumable, they are obtained with higher voltage, larger v oltage ripple and lower filtration than used by the recent investigato rs.