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

• Autorzy: Golnik N. , Zielczyński M.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

radiation quality; recombination chambers; X-rays

PL

jakość radioterapii; komora rekombinacyjna; promieniowanie rentgenowskie

• Wydawca: Nałęcz Institute of Biocybernetics and Biomedical Engineering of the Polish Academy of Sciences ; Elsevier
• Czasopismo: Biocybernetics and Biomedical Engineering
• Rocznik: 2005
• Tom: Vol. 25, no. 1
• Strony: 65--72
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Golnik N.

• Institute of Precision and Biomedical Engineering, Warsaw University of Technology, ul. św. Andrzeja Boboli 8, 00-525 Warszawa, Poland

autor

Zielczyński M.

• Institute of Atomic Energy, Otwock-Świerk, Poland

Bibliografia

• [1] International Commission on Radiological Protection: Recommendations of the ICRP. Publication 60, Annals of the ICRP 21 No. 1-3, Pergamon Press, New York 1991.
• [2] Gohagan J.K., Darby W.P., Spitznagel E.L.: Radiogenic breast cancer effects of mammographic screening. J. Natl. Cancer Inst. 1986, 77, 71-76.
• [3] Heyes G.J., Mill A.J., Charles M.W., Hugtenberg R., Beddoe A.H.: Low LET (sparsely ionising) radiations: Cancer risk for mammography patients. In: Proc. of the 2003 World Congress on Medical Physics and Biomedical Engineering, Sydney, August 24-29 2003, ISBN 1877040142, 3630.
• [4] Zielczynski M„ Golnik N., Makarewicz M., Sullivan A.H.: Definition of radiation quality by initial recombination of ions. In: J. Booz, H. G. Ebert and H. D. Hartfiel (Eds) Proc. 7th Symp. on Microdosimetry, CEC, Luxembourg, EUR 7147, 1981, 853-862.
• [5] Jaffe G.: Theorie der Ionisation in Kolonnen. Ann. Phys. 1913, 42, 303-344.
• [6] Lea D.E.: The theory of ionization measurements in gases at high pressures. Proc. Camb. Phil. Soc. 1933,30,80-101.
• [7] Sullivan A.H.: The estimation of the distribution of energy loss of ionizing radiations from observations of the initial recombination of the ions in a gas. Report CERN 69-1, CERN, Geneva 1969.
• [8] Golnik N.: Recombination methods for the dosimetry of mixed radiation fields, Report IAE-20/A, Institute of Atomic Energy, Otwock-Świerk, Poland 1996.
• [9] Zielczynski M., Golnik N.: Recombination index of radiation quality — Measuring and applications. Radiat. Prot. Dosim. 52, 1994, 419-422.
• [10] Golnik N., Cherevatenko E. P., Serov A. Y., Shvidkij S. V., Sychev, B. S. and Zielczynski, M.: Recombination index of radiation quality of medical high energy neutron beams. Radiat. Prot. Dosim., 70(1-4), 215-218 (1997).
• [11] Zielczynski M., Golnik N., Rusinowski Z.: A computer controlled ambient dose equivalent meter based on a recombination chamber. Nucl. Instr. and Meth. in Phys. Res. A. 370, 1996, 563-567.
• [12] Hubbel J.H., Seltzer S.M.: http://physics.nist.gov/PhysRefData.
• [13] Olko P.: Microdosimetric interpretation of thermoluminescence efficiency of LiF:Mg,Cu,P (MCP-N) detectors for weakly and densely ionising radiations. Radiat. Prot. Dosim. 65(1-4), 1996, 151-158.