| Comparison of TLD calibration methods for 192Ir dosimetry. | |
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MedLine Citation:
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PMID: 23318392 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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For the purpose of dose measurement using a high-dose rate 192Ir source, four methods of thermoluminescent dosimeter (TLD) calibration were investigated. Three of the four calibration methods used the 192Ir source. Dwell times were calculated to deliver 1 Gy to the TLDs irradiated either in air or water. Dwell time calculations were confirmed by direct measurement using an ionization chamber. The fourth method of calibration used 6 MV photons from a medical linear accelerator, and an energy correction factor was applied to account for the difference in sensitivity of the TLDs in 192Ir and 6 MV. The results of the four TLD calibration methods are presented in terms of the results of a brachytherapy audit where seven Australian centers irradiated three sets of TLDs in a water phantom. The results were in agreement within estimated uncertainties when the TLDs were calibrated with the 192Ir source. Calibrating TLDs in a phantom similar to that used for the audit proved to be the most practical method and provided the greatest confidence in measured dose. When calibrated using 6 MV photons, the TLD results were consistently higher than the 192Ir-calibrated TLDs, suggesting this method does not fully correct for the response of the TLDs when irradiated in the audit phantom. |
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Authors:
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Annette Haworth; Duncan J Butler; Lisa Wilfert; Martin A Ebert; Stephen P Todd; Anna J M Hayton; Tomas Kron |
Publication Detail:
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Type: Journal Article Date: 2013-01-07 |
Journal Detail:
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Title: Journal of applied clinical medical physics / American College of Medical Physics Volume: 14 ISSN: 1526-9914 ISO Abbreviation: J Appl Clin Med Phys Publication Date: 2013 |
Date Detail:
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Created Date: 2013-01-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101089176 Medline TA: J Appl Clin Med Phys Country: United States |
Other Details:
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Languages: eng Pagination: 4037 Citation Subset: IM |
Affiliation:
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Peter MacCallum Cancer Centre. annette.haworth@petermac.org. |
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Descriptor/Qualifier:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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