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SU‐E‐T‐86: Evaluation of the OSLD System for Remote Dosimetry Audits Implemented by the RPC
Author(s) -
Alvarez P,
Aguirre J,
Followill D
Publication year - 2011
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3612037
Subject(s) - dosimeter , dosimetry , thermoluminescent dosimeter , optically stimulated luminescence , calibration , physics , nuclear medicine , medical physics , medicine , quantum mechanics
Purpose: Analysis of the performance of the optically stimulated luminescence dosimetry (OSLD) system implemented by the Radiological Physics Center (RPC) for external audits compare to the termoluminescent dosimetry (TLD) system.Methods: The RPC translated the TLD system for external audits to the OSLD system on June 2010. This last system is based on nanoDo dosimeters. The logistic of the system was designed and is managed by the RPCˈs data base (RADS). The calculation of dose, the storage of data and evaluation of results is also done by the same data base. The verification of output is based on irradiation of dosimeters in acrylic phantoms. The geometry for irradiation is the reference geometry for output calibration. The dose level change from 300cGy for TLD to 100cGy for OSLD. Both system are designed for X‐ray beam from 4 to 23 MV and electrons beams from 6 to 23 MeV. Results: The average ratio between RPC dose and institution dose at the point of dose verification is 1.000 ± 1.9% for TLD system for the last 5 years. While this average is 0.999 ± 1.7% for OSLD system since it was implemented. This average was analyzed based on the whole population of results, The average was also analyzed per type of beam and per energy without showing differences. The OSLD system allows the RPC to evaluate more beams during reading sessions. Evaluation of accumulated dose and history of dosimeter are valuable Conclusions: The average ratio between RPC dose and institution dose at the point of dose verification did not change from TLD system to OSLD system. The identification of dosimeters is important to keep track of irradiations especially when reuse of the dosimeter is one of the advantages of this system. This work was supported by PHS CA010953 awarded by NCI, DHHS