Charge collection efficiency in ionization chambers exposed to electron beams with high dose per pulse

Physics in Medicine and Biology

Volumn 51, Issue 24, 2006, Pages 6419-6436

  Laitano, R F ^a   Guerra, A S ^a   Pimpinella, M ^a   Caporali, C ^a   Petrucci, A ^b  

^a ENEA C R CASACCIA   (Italy)

^b SAN FILIPPO NERI HOSPITAL   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRON BEAMS; ELECTRON ENERGY LEVELS; ENERGY ABSORPTION; IONIZATION CHAMBERS; IONS; LASER PULSES; VOLTAGE MEASUREMENT;

CHAMBER CAVITIES; CHARGE COLLECTION; CHARGE RECOMBINATION; TWO VOLTAGE ANALYSIS (TVA);

CHARGE TRANSFER;

ARTICLE; DOSIMETRY; ELECTRON BEAM; EXPERIMENTAL STUDY; IONIZATION CHAMBER; MATHEMATICAL MODEL; PHYSICAL PARAMETERS; PRIORITY JOURNAL; VALIDITY;

CALIBRATION; ELECTROMAGNETIC FIELDS; ELECTRONS; HUMANS; IONS; MODELS, STATISTICAL; MODELS, THEORETICAL; PARTICLE ACCELERATORS; RADIATION DOSAGE; RADIOMETRY; RADIOTHERAPY DOSAGE; RADIOTHERAPY PLANNING, COMPUTER-ASSISTED; RADIOTHERAPY, HIGH-ENERGY;

EID: 33846866290     PISSN: 00319155     EISSN: 13616560     Source Type: Journal    
DOI: 10.1088/0031-9155/51/24/009     Document Type: Article

References (19)

1. Almond P R, Biggs P J, Coursey B M, Hanson W F, Huq M S, Nath R and Rogers D W O 1999 AAPM's TG-51 protocol for clinical reference dosimetry of high-energy photon and electron beams Med. Phys. 26 1847-70
2. Andreo P, Burns D T, Hohlfeld K, Huq M S, Kanai T, Laitano F, Smyth V and Vynckier S 2000 Absorbed dose determination in external beam radiotherapy: an international code of practice for dosimetry based on standards of absorbed dose to water IAEA Technical Report Series No 398 (Vienna: IAEA)
3. Balk O A, Hochhäuser E, Hahn K, Krimmel K, Arnold W and Schneider H 1998 Time resolving ionization monitor for microsecond radiation impulses Phys. Med. Biol. 43 3129-37
4. Bielajew A F 1985 The effect of free electrons on ionization chamber saturation curves Med. Phys. 12 197-200
5. Boag J W 1987 Ionization chambers The Dosimetry of Ionizing Radiation vol 2 ed K R Kase, B E Bjärngard and F H Attix (New York: Academic) pp 169-243
6. Boag J W and Currant J 1980 Current collection and ionic recombination in small cylidrical ionization chambers exposed to pulsed radiation Br. J. Radiol. 53 471-8
7. Boag J W, Hochhäuser E and Balk O A 1996 The effect of free-electron collection on the recombination correction to ionization measurements of pulsed radiation Phys. Med. Biol. 41 885-97
8. Conere T J and Boag J W 1984 The collection efficiency of an ionization chamber in a pulsed and magnetically swept electron beam: limits of validity of the two-voltage technique Med. Phys. 11 465-68
9. De Blois F, Zankowsky C and Podgorsak E B 2000 Saturation current and collection efficiency for ionization chambers in pulsed beams Med. Phys. 27 1146-55
10. Di Martino F, Giannelli M, Traino A C and Lazzeri M 2005 Ion recombination correction for very high dose-per-pulse high-energy electron beams Med. Phys. 32 2204-10
11. Hochhäuser E and Balk O A 1986 The influence of unattached electrons on the collection efficiency of ionisation chambers for the measurement of radiation pulses of high dose rate Phys. Med. Biol. 31 223-33
12. Hochhäuser E, Balk O A, Schneider H and Arnold W 1994 Die Bedeutung der Lebensdauer und Absaugzeit freier Elektronen für die Rekombinationskorrektur in der ionometrischen Pulsdosimetrie J. Phys. D: Appl. Phys. 27 431-40
13. Huxley L G H and Crompton R W 1974 The Diffusion and Drift of Electrons in Gases (New York: Wiley)
14. 60Co γ-rays and high-energy x-rays Phys. Med. Biol. 44 1609-24
15. ICRU (International Commission on Radiation Units and Measurements) 1982 The dosimetry of pulsed radiation ICRU Report 34 (Bethesda, MD: ICRU)
16. ISO (International Organization for Standardization) 1995 Guide to the Expression of Uncertainty in Measurement 2nd edn (Geneva: ISO)
17. Piermattei A, delle Canne S, Azario L, Russo A, Fidanzio A, Miceli R, Soriani A, Orvieto A and Fantini M 2000 The saturation loss for plane parallel ionization chambers at high dose per pulse values Phys. Med. Biol. 45 1869-83
18. Roos M and Derikum K 2000 The recombination correction and the dependence of the response of plane parallel chambers on the polarizing voltage in pulsed electron and photon beams: review of data and methods recommended in the international code of practice for dosimetry IAEA Technical Report Series No 381: the use of plane parallel ionization chambers in high energy electron and photon beams IAEA-TECDOC-1173 (Vienna: IAEA) pp 53-64
19. Rossi B B and Staub H H 1949 Ionization Chambers and Counters- Experimental Techniques (New York: McGraw-Hill)