Comparison of ionisation measurements in water and polystyrene for electron beam dosimetry
For the determination of absorbed dose to water in electron beams, dosimetry protocols advocate ionisation measurements in plastic phantoms instead of water for practical reasons. The chamber readings in polystyrene at the depth of maximum ionisation must be corrected for the difference in physical...
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Published in | Physics in medicine & biology Vol. 30; no. 10; pp. 1043 - 1053 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
01.10.1985
Institute of Physics |
Subjects | |
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Abstract | For the determination of absorbed dose to water in electron beams, dosimetry protocols advocate ionisation measurements in plastic phantoms instead of water for practical reasons. The chamber readings in polystyrene at the depth of maximum ionisation must be corrected for the difference in physical properties between the two materials. This correction factor was determined for a Farmer 0.6 cm3 graphite-walled chamber in electron beams with mean energies at the phantom surface between 6 and 19 MeV. Experiments with white polystyrene yielded corrections for the measured ionisation ranging from 0.3 to 2.4%. For clear polystyrene, 0.6-1% higher corrections were found. For beams with the same mean energy at the phantom surface, but with different beam-flattening and collimation systems, variations in this correction up to 1.2% were observed. In contrast to recent reports on electrical charge storage in polystyrene due to electron irradiation, our experiments do not show differences in the chamber readings any larger than 0.5%. |
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AbstractList | For the determination of absorbed dose to water in electron beams, dosimetry protocols advocate ionisation measurements in plastic phantoms instead of water for practical reasons. The chamber readings in polystyrene at the depth of maximum ionisation must be corrected for the difference in physical properties between the two materials. This correction factor was determined for a Farmer 0.6 cm3 graphite-walled chamber in electron beams with mean energies at the phantom surface between 6 and 19 MeV. Experiments with white polystyrene yielded corrections for the measured ionisation ranging from 0.3 to 2.4%. For clear polystyrene, 0.6-1% higher corrections were found. For beams with the same mean energy at the phantom surface, but with different beam-flattening and collimation systems, variations in this correction up to 1.2% were observed. In contrast to recent reports on electrical charge storage in polystyrene due to electron irradiation, our experiments do not show differences in the chamber readings any larger than 0.5%. For the determination of absorbed dose to water in electron beams, dosimetry protocols advocate ionisation measurements in plastic phantoms instead of water for practical reasons. The chamber readings in polystyrene at the depth of maximum ionisation must be corrected for the difference in physical properties between the two materials. This correction factor was determined for a Farmer 0.6 cm super(3) graphite-walled chamber in electron beams with mean energies at the phantom surface between 6 and 19 MeV. Experiments with white polystyrene yielded corrections for the measured ionisation ranging from 0.3 to 2.4%. For clear polystyrene, 0.6-1% higher corrections were found. For beams with the same mean energy at the phantom surface, but with different beam-flattening and collimation systems, variations in this correction up to 1.2% were observed. |
Author | Heukelom, S Bruinvis, I A D Mijnheer, B J |
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Cites_doi | 10.1118/1.595601 10.1118/1.595569 10.1118/1.595446 10.1118/1.595590 10.3109/02841868109130229 10.1118/1.595055 10.1259/0007-1285-51-605-397-b 10.1118/1.595464 10.1088/0031-9155/30/1/005 10.1088/0031-9155/29/9/013 10.3109/02841868009130136 10.3109/02841868109130228 10.3109/02841867109129772 10.3109/02841868409136038 |
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Keywords | Water Absorbed dose Ionization Measurement result Electron beam Styrene polymer Correction factor Linear accelerator Dosimetry Comparative study |
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References | Galbraith D M (4) 1984; 11 Kase K R (7) 1984 NACP (14) 1981; 20 Mattsson L O (9) 1985 Kase K R (8) 1982; 9 AAPM (1) 1983; 10 Mattsson L O (12) 1984; 23 Thwaites D I (17) 1984; 29 Hogstrom K R (5) 1982; 9 Mattsson L O (10) 1981; 20 ICRU (6) 1984 White D R (20) 1978; 51 Svensson H (16) 1971; 10 Thwaites D I (18) 1985; 30 Mattsson L O (11) 1984; 11 Rawlinson J A (15) 1984; 11 van der Laarse R (19) 1978; 17 Andreo P (2) 1984; 11 Brahme A (3) 1983; 364 NACP (13) 1980; 19 |
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Snippet | For the determination of absorbed dose to water in electron beams, dosimetry protocols advocate ionisation measurements in plastic phantoms instead of water... |
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SubjectTerms | Biological and medical sciences Biological effects of radiation Electrons Fundamental and applied biological sciences. Psychology Ionizing radiations Models, Anatomic Particle Accelerators Polystyrenes Radiation Dosage Radiometry - instrumentation Scattering, Radiation Tissues, organs and organisms biophysics Water |
Title | Comparison of ionisation measurements in water and polystyrene for electron beam dosimetry |
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