Online citations, reference lists, and bibliographies.

Absorbed-dose Calibrations In High-energy Photon Beams At The National Physical Laboratory: Conversion Procedure.

Jean Ellen Burns
Published 1994 · Physics, Medicine
Cite This
Download PDF
Analyze on Scholarcy
Share
The absorbed-dose calibration service from NPL is based on a primary-standard calorimeter that measures absorbed dose to graphite. Secondary-standard dosemeters are calibrated in absorbed dose to water in a 60Co gamma-ray beam and in x-ray beams over a range of generating potentials from 4 MV to 19 MV. Two methods were used to convert the calibrations of working-standard ionization chambers from absorbed dose to graphite into absorbed dose to water. One method involved the use of published interaction data for photons and secondary electrons, and required a knowledge of the chamber construction. The second method involved the calculation of the ratio of absorbed dose in graphite and water phantoms irradiated consecutively in the same photon beam using the photon-fluence scaling theorem. The two methods were in agreement to 0.1%.



This paper is referenced by
10.1088/0031-9155/41/1/011
The UK primary standard calorimeter for photon-beam absorbed dose measurement.
Alan Dusautoy (1996)
Comparison of the NPL water calorimeter with other dosimetric techniques for high energy photon beams.
Karen E Rosser (1999)
Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry based on Standards of Absorbed Dose to Water
Pedro Andreo (2001)
The development of new devices for accurate radiation dose measurement: A guarded liquid ionization chamber and an electron sealed water calorimeter
K J Stewart (2007)
10.1088/0026-1394/48/5/018
Transfer of the UK absorbed dose primary standard for photon beams from the research linac to the clinical linac at NPL
Julia Pearce (2011)
Comparison of the standards of absorbed dose to water of the OMH and the BIPM for 60 Co γ rays
D. Thornburn Burns (2003)
10.1007/s13246-011-0102-4
Determination of RW3-to-water mass-energy absorption coefficient ratio for absolute dosimetry
Katrina Y. T. Seet (2011)
10.1097/00004032-200111000-00017
Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry Based on Standards of Absorbed Dose to Water; Technical Reports Series No. 398,
Stephen V. Musolino (2001)
10.1120/jacmp.v10i1.2810
Comparison of IPSM 1990 photon dosimetry code of practice with IAEA TRS‐398 and AAPM TG‐51.
Silvia Vargas Castrillón (2009)
Monte Carlo evaluation of the dosimetric uncertainty in matched 6 MV Elekta and Varian linear accelerators
Jessica E Lye (2012)
10.1088/1361-6560/aaf5ac
Determination of k Q factors for cylindrical and plane-parallel ionization chambers in a scanned carbon ion beam by means of cross calibration.
J-M Osinga-Blättermann (2018)
NPL calorimetry: the evolution so far.
Alan Dusautoy (1999)
10.1088/0031-9155/58/10/3481
Fluence correction factors for graphite calorimetry in a low-energy clinical proton beam: I. Analytical and Monte Carlo simulations.
Hugo Palmans (2013)
Alanine dosimetry at NPL - the development of a mailed reference dosimetry service at radiotherapy dose levels.
P. H. G. Sharpe (1998)
10.1088/0026-1394/48/1A/06009
Supplementary comparison CCRI(I)-S2 of standards for absorbed dose to water in 60 Co gamma radiation at radiation processing dose levels
D. Thornburn Burns (2011)
Comparison of the standards for absorbed dose to water of the ARPANSA and the BIPM for Co gamma radiation
Penelope Allisy-Roberts (2001)
10.1088/0026-1394/49/1A/06008
Comparison of the standards for absorbed dose to water of the NPL, United Kingdom and the BIPM for 60Co γ rays
C Kessler (2012)
10.1093/rpd/ncs276
Direct MC conversion of absorbed dose to graphite to absorbed dose to water for 60Co radiation.
Jessica E Lye (2013)
Semantic Scholar Logo Some data provided by SemanticScholar