Properties of the 4.45 eV optical absorption band in LiF:Mg,Ti.
The optical absorption (OA) and thermoluminescence (TL) of dosimetric LiF:Mg,Ti (TLD-100) as well as nominally pure LiF single crystal have been studied as a function of irradiation dose, thermal and optical bleaching in order to investigate the role of the 4.45 eV OA band in low temperature TL. Computerised deconvolution was used to resolve the absorption spectrum into individual gaussian bands and the TL glow curve into glow peaks. Although the 4.45 eV OA band shows thermal decay characteristics similar to the 4.0 eV band its dose filling constant and optical bleaching properties suggest that it cannot be associated with the TL of composite peaks 4 or 5. Its presence in optical grade single crystal LiF further suggests that it is an intrinsic defect or possibly associated with chance impurities other than Mg, Ti.
Nail
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Physics Department, Ben Gurion University of the Negev, Beer Sheva 84105, Israel.
Oster
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Horowitz
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Biderman
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Belaish
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D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects*; D008027:Light; D018020:Lithium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D008274:Magnesium / Q000737:chemistry / Q000528:radiation effects; D008422:Materials Testing; D008956:Models, Chemical; D011829:Radiation Dosage; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects
D018020:Lithium Compounds; C027651:lithium fluoride; D014025:Titanium; D008274:Magnesium; D005459:Fluorides