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Absorbed dose beam quality factors for cylindrical ion chambers: Experimental determination at 6 and 15 MV photon beams

Abstract

Ion chambers calibrated in terms of absorbed dose to water need an additional factor conventionally designed by k{sub Q} in order to determine the absorbed dose. The quantity k{sub Q} depends on beam quality and chamber characteristics. Rogers and Andreo provided calculations of the k{sub Q} factors for most commercially available ionization chambers for clinical dosimetry. Experimental determinations of the k{sub Q} factors for a number of cylindrical ion chambers have been made and are compared with the calculated values so far published. Measurements were made at 6 MV and 15 MV clinical photon beams at a point in water phantom where the ion chambers and a Fricke dosimeter were alternatively irradiated. The uncertainty on the experimental k{sub Q} factors resulted about {+-} 0.6%. The theoretical and experimental k{sub Q} values are in fairly good agreement. (author). 12 refs, 3 tabs.
Authors:
Caporali, C; Guerra, A S; Laitano, R F; Pimpinella, M [1] 
  1. ENEA-Casaccia, Inst. Nazionale di Meterologia delle Radiazioni Ionizzanti, Rome (Italy). Dipt. Ambiente
Publication Date:
Aug 01, 1996
Product Type:
Conference
Report Number:
IAEA-TECDOC-896; CONF-940864-
Reference Number:
SCA: 560101; 440100; PA: AIX-28:017933; EDB-97:029751; SN: 97001735774
Resource Relation:
Conference: Interregional seminar on radiotherapy dosimetry: radiation dose in radiotherapy from prescription to delivery, Rio de Janeiro (Brazil), 27-30 Aug 1994; Other Information: PBD: Aug 1996; Related Information: Is Part Of Radiation dose in radiotherapy from prescription to delivery; PB: 293 p.
Subject:
56 BIOLOGY AND MEDICINE, APPLIED STUDIES; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; IONIZATION CHAMBERS; BEAM MONITORING; QUALITY FACTOR; CALIBRATION; DOSIMETRY; MEASURING METHODS; PHANTOMS; RADIATION DOSES; RADIOTHERAPY
OSTI ID:
429931
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1011-4289; Other: ON: DE97614216; TRN: XA9642857017933
Availability:
INIS; OSTI as DE97614216
Submitting Site:
INIS
Size:
pp. 171-178
Announcement Date:

Citation Formats

Caporali, C, Guerra, A S, Laitano, R F, and Pimpinella, M. Absorbed dose beam quality factors for cylindrical ion chambers: Experimental determination at 6 and 15 MV photon beams. IAEA: N. p., 1996. Web.
Caporali, C, Guerra, A S, Laitano, R F, & Pimpinella, M. Absorbed dose beam quality factors for cylindrical ion chambers: Experimental determination at 6 and 15 MV photon beams. IAEA.
Caporali, C, Guerra, A S, Laitano, R F, and Pimpinella, M. 1996. "Absorbed dose beam quality factors for cylindrical ion chambers: Experimental determination at 6 and 15 MV photon beams." IAEA.
@misc{etde_429931,
title = {Absorbed dose beam quality factors for cylindrical ion chambers: Experimental determination at 6 and 15 MV photon beams}
author = {Caporali, C, Guerra, A S, Laitano, R F, and Pimpinella, M}
abstractNote = {Ion chambers calibrated in terms of absorbed dose to water need an additional factor conventionally designed by k{sub Q} in order to determine the absorbed dose. The quantity k{sub Q} depends on beam quality and chamber characteristics. Rogers and Andreo provided calculations of the k{sub Q} factors for most commercially available ionization chambers for clinical dosimetry. Experimental determinations of the k{sub Q} factors for a number of cylindrical ion chambers have been made and are compared with the calculated values so far published. Measurements were made at 6 MV and 15 MV clinical photon beams at a point in water phantom where the ion chambers and a Fricke dosimeter were alternatively irradiated. The uncertainty on the experimental k{sub Q} factors resulted about {+-} 0.6%. The theoretical and experimental k{sub Q} values are in fairly good agreement. (author). 12 refs, 3 tabs.}
place = {IAEA}
year = {1996}
month = {Aug}
}