Long-term fading of LiF:Mg, Cu, P and LiF:Mg, Ti thermoluminescence detectors with standard and modified activator composition

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• 作者：Marta Ptaszkiewicz
• 关键词：Thermoluminescence ; LiF ; Mg ; Cu ; P ; LiF ; Mg ; Ti ; TL dosimetry
• 刊名：Radiation Measurements
• 出版年：2007
• 出版时间：April-May 2007
• 年：2007
• 卷：42
• 期：4-5
• 页码：605-608
• 全文大小：311 K

文摘

Within a space experiment MATROSHKA, a human phantom with over 3000 TLDs inside, was exposed outside of the International Space Station during the period of 1.5 year to determine radiation organ doses that would be received by astronauts during the extra vehicular activities on the Earth orbit. Due to the long exposure period and unusual temperature conditions it was necessary to consider the loss of signal of TL detectors in time (fading). One-year fading, determined in standard conditions me=""mml2"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml2&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=df4d2f9e896220fca6f17305ad723b88"">mg src=""http://www.sciencedirect.com/cache/MiamiImageURL/B6TVS-4N3P0BB-J-N/0?wchp=dGLzVlz-zSkzS"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=15 width=79> for lithium fluoride detectors varied between me=""mml3"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml3&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=fefd4f1612033047e572da69508762a5"" title=""Click to view the MathML source"">5 % ±1.4 % (1 SD) for MTS-7 me=""mml4"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml4&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=8bf488f0aedba20f2d381f00d03d8f6e"">mg src=""http://www.sciencedirect.com/cache/MiamiImageURL/B6TVS-4N3P0BB-J-1F/0?wchp=dGLzVlz-zSkzS"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=19 width=102>, me=""mml5"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml5&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=260fe44636787abc0b9b3799522e9296"" title=""Click to view the MathML source"">24 % ±1.7 % (1 SD) for MTT-7 me=""mml6"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml6&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=779f204bc367fb2cf2755db3729cadef"">mg src=""http://www.sciencedirect.com/cache/MiamiImageURL/B6TVS-4N3P0BB-J-1V/0?wchp=dGLzVlz-zSkzS"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=19 width=102> and me=""mml7"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml7&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=8c2f7164c6ab0795d79f80782369c424"" title=""Click to view the MathML source"">9 % ±2.5 % (1 SD) for MCP-7 (me=""mml8"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml8&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=6c65ce5ccf1e5c499ed2300feb2ea465"">mg src=""http://www.sciencedirect.com/cache/MiamiImageURL/B6TVS-4N3P0BB-J-1X/0?wchp=dGLzVlz-zSkzS"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=19 width=67>, Cu, P). To reduce fading different post-exposure annealing were investigated (temperatures from 100 to me=""mml9"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml9&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=b1c9c1489064db4639d4343fd540d18b"">mg src=""http://www.sciencedirect.com/cache/MiamiImageURL/B6TVS-4N3P0BB-J-1Y/0?wchp=dGLzVlz-zSkzS"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=14 width=46> and time from 10 to 50 min). The optimum condition was observed for me=""mml10"">method=retrieve&_udi=B6TVS-4N3P0BB-J&_mathId=mml10&_user=10&_cdi=5542&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=ffcb5086c8d03940ad7f95c2c0bf95c4"">mg src=""http://www.sciencedirect.com/cache/MiamiImageURL/B6TVS-4N3P0BB-J-9/0?wchp=dGLzVlz-zSkzS"" alt=""Click to view the MathML source"" align=""absbottom"" border=""0"" height=16 width=107> which decreases the fading below 5 % . This annealing, intended to remove the peak 3 in the LiF TL glow curves, was applied to all TL detectors just by IFJ Krakow in MATROSHKA experiment.