Evaluation of the relative effectiveness of LiF-based TL detectors for electron radiotherapy beams over the energy range 6–20 MeV

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• 作者：D. Nahajowski ; E. Gó ; ra ; B. Rozwadowska-Bogusz ; J. Lesiak ; B. Polak ; D. Kabat ; P. Zawadzki ; M.P.R. Waligó ; rski
• 关键词：TL ; LiF ; Mg ; Ti ; MTS-N ; Cu ; P(MCP-N) ; LiB name="mml20">n ; none ; color ; black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml20&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10
• 刊名：Radiation Measurements
• 出版年：2008
• 期刊代码：71_13504487
• 类别：ce
• 出版时间：February-June 2008
• 卷：43
• 期：2-6
• 页码：879-882
• 文件大小：126 K

摘要

We have performed systematic measurements of the efficiency, name="mml12">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml12&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=3a18034433ba455dbb32de06b790930f" title="Click to view the MathML source" alt="Click to view the MathML source">C_E=ncedirect.com/scidirimg/entities/2329.gif" alt="left angle bracket" title="left angle bracket" border="0">TLO_γncedirect.com/scidirimg/entities/232a.gif" alt="right-pointing angle bracket" title="right-pointing angle bracket" border="0">/ncedirect.com/scidirimg/entities/2329.gif" alt="left angle bracket" title="left angle bracket" border="0">TLO_Encedirect.com/scidirimg/entities/232a.gif" alt="right-pointing angle bracket" title="right-pointing angle bracket" border="0">, of MTS-N (LiF:Mg,Ti) and LiB name="mml13">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml13&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=cae8e54dfc8fba6f657052e96e1e7ea5" title="Click to view the MathML source" alt="Click to view the MathML source">(Li₂B₄O₇:Mn,Si) thermoluminescence (TL) detectors exposed to electron radiotherapy beams of nominal energy 6, 9, 12, 16 and 20 MeV relative to Co-60 or 6 MV photon beams (name="mml14">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml14&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=1ac1774a54883281acef310003697767" title="Click to view the MathML source" alt="Click to view the MathML source">ncedirect.com/scidirimg/entities/2329.gif" alt="left angle bracket" title="left angle bracket" border="0">TLOncedirect.com/scidirimg/entities/232a.gif" alt="right-pointing angle bracket" title="right-pointing angle bracket" border="0"> is the average TL output of a batch of detectors exposed to a given dose of photon beam radiation or to a beam of electrons of energy name="mml15">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml15&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=389ce0ab90b68294b2d30c4f1c250d1a" title="Click to view the MathML source" alt="Click to view the MathML source">E). The TL detectors were sintered pellets of 4.5 mm diameter and ca. 0.8 mm thickness. Detectors were exposed in water to 2 Gy at respective energy-dependent depths name="mml16">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml16&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=ac3f6cd377ee17d78e1e7d48bae77211" title="Click to view the MathML source" alt="Click to view the MathML source">d_max applied in clinical dosimetry. The obtained results were re-calculated versus mean electron energy in the beam at depths name="mml17">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml17&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=83d8a474477c346c1dbfcda23e24a601" title="Click to view the MathML source" alt="Click to view the MathML source">d_max. We found that, for clinical purposes, both types of TL detectors show no energy dependence: presented as average values over the investigated energy range, for MTS-N detectors name="mml18">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml18&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=95abbd31e9b4ecefd85b5f1fe9141adb" title="Click to view the MathML source" alt="Click to view the MathML source">ncedirect.com/scidirimg/entities/2329.gif" alt="left angle bracket" title="left angle bracket" border="0">C_Encedirect.com/scidirimg/entities/232a.gif" alt="right-pointing angle bracket" title="right-pointing angle bracket" border="0">=1.07±1.1% and for LiB name="mml19">n:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVS-4R7RSB0-3&_mathId=mml19&_user=1067359&_cdi=5542&_rdoc=162&_acct=C000050221&_version=1&_userid=10&md5=40e37fcc5badbf263978b4196c6fede1" title="Click to view the MathML source" alt="Click to view the MathML source">ncedirect.com/scidirimg/entities/2329.gif" alt="left angle bracket" title="left angle bracket" border="0">C_Encedirect.com/scidirimg/entities/232a.gif" alt="right-pointing angle bracket" title="right-pointing angle bracket" border="0">=1.03±1.7%. Thus, while no correction is required for dose values estimated by LiB TLDs, the under-response of MTS-N detectors exposed to a beam of electrons has to be corrected by about 7%. At mean energy of electrons in therapeutic electron beams below about 5 MeV a decline in the response of both types of TL detectors is observed.