Calibration of ionization chamber in megavoltage x-ray field of medical linear accelerator
Ionization chambers were calibrated regarding absorbed dose to water in MeV X-ray fields of a medical linear accelerator, with nominal maximum energies of 6 MeV and 15 MeV. Whereas, absorbed doses to water at a depth of 10 cm below the water surface were measured using the same ionization c...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
VINCA Institute of Nuclear Sciences
2024-01-01
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| Series: | Nuclear Technology and Radiation Protection |
| Subjects: | |
| Online Access: | https://doiserbia.nb.rs/img/doi/1451-3994/2024/1451-39942403220P.pdf |
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| Summary: | Ionization chambers were calibrated regarding absorbed dose to water in MeV
X-ray fields of a medical linear accelerator, with nominal maximum energies
of 6 MeV and 15 MeV. Whereas, absorbed doses to water at a depth of 10 cm
below the water surface were measured using the same ionization chamber
(referred to as IC-1) in two different manners (i.e., applying the old beam
quality correction factor kQ0 from the old IAEA/TRS-398 protocol, referred to
as D1-old10 and using the new one, kQ from the updated protocol, referred
to as D1-new10. The calibration factors of IC-1, ND1,D,w, Q were
deduced (for beam qualities Q of MeV X-ray fields with maximum energies of 6
MeV and 15 MeV). The identical procedure was applied to two other ionization
chambers (IC-i, i=2,3) to obtain absorbed doses to water at a depth of 10
cm (referred to as Di-new10) using the new beam quality correction factor.
A comparison between D1-new10 and Di-new10 was conducted to derive the
calibration factors of the IC-i, NiD,w,Q. The combined
standard uncertainties of NiD,w,Q (i =1,2,3) were estimated within 1.22%
and 2.30%, respectively. |
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| ISSN: | 1451-3994 1452-8185 |