Determination of saturation charge and collection efficiency for ionization chambers in continuous beams

Medical Physics

Volumn 25, Issue 6, 1998, Pages 908-915

  Zankowski, Corey ^a   Podgorsak, Ervin B ^a  

^a MONTREAL GENERAL HOSPITAL   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

DIFFUSION IN SOLIDS; DOSIMETRY; EFFICIENCY; GAMMA RAYS; IONIZATION CHAMBERS;

CHARGE MULTIPLICATION; COLLECTION EFFICIENCY; COMPREHENSIVE MODEL; CONTINUOUS RADIATION; LINEAR RELATIONSHIPS; OPERATING CONDITION; SATURATION CHARACTERISTIC; SATURATION REGION;

IONIZATION;

ION;

ARTICLE; CLINICAL PROTOCOL; DIFFUSION; DOSIMETRY; ELECTRIC FIELD; GAMMA RADIATION; IONIZATION CHAMBER; PRIORITY JOURNAL; RADIATION BEAM; RADIATION FIELD; THEORY;

EID: 0031859012     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.598269     Document Type: Article

References (28)

1. L. V. Spencer and F. H. Attix, "A theory of cavity ionization," Radiat. Res. 3, 239-254 (1955).
2. F. H. Attix, Introduction to Radiological Physics and Radiation Dosimetry (Wiley, New York, 1986).
3. P. N. Jeffery, J. W. Boag, and H. E. Johns, "Electron avalanche amplification in x-ray imaging devices," Phys. Med. Biol. 19, 593-604 (1974).
4. J. W. Boag, in The Dosimetry of Ionizing Radiation, edited by K. R Kase, B. E. Bjärngard, and F. H. Attix (Academic, Orlando, 1987), Vol. 2. Chap. 3.
5. H. Zanstra, "A rapid method for determining the saturation current by the Jaffé theory of columnar ionization," Physica (Amsterdam) 2, 817-824 (1935).
6. M. Boutillon and M. T. Niatel, "A study of a graphite cavity chamber for absolute exposure measurements of Co-60 gamma rays," Metrologia 9, 139-146 (1973).
7. P. B. Scott and J. R Greening, "The determination of saturation currents in free-air ionization chambers by extrapolation methods," Phys. Med. Biol. 8, 51-57 (1963).
8. G. Mie, "Der elektrische Strom in ionisierter Luft in einem ebenen Kondensator," Ann. Phys. (Leipzig) 13, 857-889 (1904)
9. J. R. Greening, "Saturation characteristics of parallel-plate ionization chambers." Phys. Med. Biol. 9, 143-154 (1964).
10. J. S. Townsend, Electricity in Gasses (Clarendon, Oxford, 1915).
11. J. W. Boag and T. Wilson, "The saturation curve at high ionization intensity," Br. J. Appl. Phys. 3, 222-229 (1952).
12. J. Böhm, "Saturation corrections for plane parallel ionization chambers," Phys. Med. Biol. 21, 754-759 (1976).
13. P. Langevin, "Mesure de la valence des ions dans les gaz," Le Radium 10, 113-124 (1913).
14. J W. Boag and J. Currant, "Current collection and ionic recombination in small cylindrical ionization chambers exposed to pulsed radiation," Br. J. Appl. Phys 53, 471-478 (1980).
15. P. R. Almond, "Use of a Victoreen 500 electrometer to determine ionization chamber collection efficiencies," Med Phys. 8, 901-904 (1981).
16. ion in the new AAPM radiotherapy dosimetry protocol," Med. Phys 11, 714-716 (1984).
17. ion, the correction factor for recombination losses in an ionization chamber," Med. Phys. 11, 846-849 (1984).
18. AAPM Task Group 21 of the Radiation Therapy Committee, "A protocol for the determination of absorbed dose from high-energy photon and electron beams," Med Phys. 10, 741-771 (1983).
19. R. Schulz, P Almond, G. Kutcher, R Loevinger, R. Nath, D Rogers, N. Suntharalingam, K. Wright, and F. Khan, "Clarification of the AAPM Task Group 21 protocol," Med. Phys. 13, 755-759 (1986).
20. G. Jaffé, "On the theory of ionization in columns. I" (in German), Ann. Phys. (Leipzig) 42, 303-344 (1913).
21. G. Jaffé, "Collumnar ionization" (in French), Le Radium 10, 126-134 (1913).
22. G. Jaffé, "On the theory of ionization in columns. II" (in German), Ann Phys. (Leipzig) 1, 977-1008 (1929).
23. G. Jaffé, "On the theory of recombination," Phys. Rev. 58, 968-976 (1940).
24. D. Lea, "The theory of ionization measurements in gasses at high pressures," Proc Cambridge Philos. Soc. 30, 80-101 (1934).
25. W. R. Kanne and J. A. Bearden, "Collumnar ionization," Phys. Rev. 50, 935-938 (1936).
26. A Muller, "On the behaviour of columnar ionization in pure gasses" (in German), Z. Phys. 145, 469-485 (1956).
27. V. H Ritz and F H. Attix, "An ionization chamber for kilocalorie source calibrations," Radiat. Res. 16, 401-415 (1962).
28. R. L. Sproull, Modern Physics, 2nd ed. (Wiley, New York, 1956).