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Comparison of TLD calibration methods for 192Ir dosimetry.
MedLine Citation:
PMID:  23318392     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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.
Authors:
Annette Haworth; Duncan J Butler; Lisa Wilfert; Martin A Ebert; Stephen P Todd; Anna J M Hayton; Tomas Kron
Publication Detail:
Type:  Journal Article     Date:  2013-01-07
Journal Detail:
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:
Created Date:  2013-01-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101089176     Medline TA:  J Appl Clin Med Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4037     Citation Subset:  IM    
Affiliation:
Peter MacCallum Cancer Centre. annette.haworth@petermac.org.
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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