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Local ion density in tracks of secondary electrons generated in tissue by diagnostic X-rays

Golnik N., Zielczyński M.

Biocybernetics and Biomedical Engineering

2005

Vol. 25, no. 1

65-72

Local ion density in the tracks of secondary electrons generated in tissue by diagnostic X-rays was determined on the basis of measurements of the recombination index of the radiation quality (RIQ), measured for X-rays ranging from 40 kVp to 230 kVp, and for several gamma radiation sources. The values obtained ranged from 1 for a (137)Cs gamma radiation source to 1.3+1.9 for X-rays. The peak value was observed for a (241)Am source and for 100 kVp X-rays. Values of RIQ reflect the effective local ion density of the investigated radiation and correlate with the relative biological effectiveness of the radiation.