Results 121 to 130 of about 705 (160)
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Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2005
Abstract Four thermoluminescence (TL) peaks at 60–90, 100–130, 130–180 and 180–220 °C (the main peak) were observed from LiF:Mg,Cu, LiF:Mg,Cu,Na and LiF:Mg,Cu,Si. The recorded emission bands were at 375 and 414 nm in LiF:Mg,Cu, at 379 and 424 nm in LiF:Mg,Cu,Na and 378 and 425 nm in LiF:Mg,Cu,Si. The loss of TL intensity and temperature shift of the
B. Yang, Q. Lu, S. Wang, P.D. Townsend
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Abstract Four thermoluminescence (TL) peaks at 60–90, 100–130, 130–180 and 180–220 °C (the main peak) were observed from LiF:Mg,Cu, LiF:Mg,Cu,Na and LiF:Mg,Cu,Si. The recorded emission bands were at 375 and 414 nm in LiF:Mg,Cu, at 379 and 424 nm in LiF:Mg,Cu,Na and 378 and 425 nm in LiF:Mg,Cu,Si. The loss of TL intensity and temperature shift of the
B. Yang, Q. Lu, S. Wang, P.D. Townsend
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Radiation Protection Dosimetry, 1996
Three LiF based thermoluminescent (TL) phosphors, namely, LiF:Mg,Ti, LiF:Mg,Cu and LiF:Mg,Cu,P were investigated for their TL glow curves, TL sensitisation, TL supralinearity, phototransferred TL (PTTL), residual TL (RTL) and emission spectra. Contrary to recently reported results, LiF:Mg,Cu,P did not show any sensitisation in the dose range 0.5-100 ...
J.K. Srivastava +4 more
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Three LiF based thermoluminescent (TL) phosphors, namely, LiF:Mg,Ti, LiF:Mg,Cu and LiF:Mg,Cu,P were investigated for their TL glow curves, TL sensitisation, TL supralinearity, phototransferred TL (PTTL), residual TL (RTL) and emission spectra. Contrary to recently reported results, LiF:Mg,Cu,P did not show any sensitisation in the dose range 0.5-100 ...
J.K. Srivastava +4 more
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Evaluating Two Extremity Dosemeters Based on LiF:Mg,Ti or LiF:Mg,Cu,P
Radiation Protection Dosimetry, 2002Evaluation of a new extremity dosemeter is presented. The dosemeter is a passive device that is easy to wear and features a permanent individual numerical ID with barcode, a watertight case, an automatic TLD reader and database management software. Two dosemeters were studied: the first consists of a 100 mg x cm(-2) 7LiF:Mg,Ti (TLD-700) chip and a 42 ...
L Z, Luo, K J, Velbeck, J E, Rotunda
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Comment on the Identification of Z Centres in LiF:Mg and LiF:Mg, Ti Single Crystals
physica status solidi (b), 1984AbstractThe Z‐centre hypothesis in LiF:Mg and LiF:Mg, Ti systems is re‐investigated. On the basis of available optical absorption measurements, summarizing the already emerged contradictions of this hypothesis, and by comparing the characteristic properties of the Z centres in LiF with those in other alkali halides it is established that the Z centre ...
A. Watterich +3 more
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Comparison of the effects of exposure to light in Harshaw LiF:Mg,Ti and LiF:Mg,Cu,P
Radiation Protection Dosimetry, 2006The response of thermoluminescence dosemeters (TLDs) to light, in various conditions, has been studied. TLD cards containing both conventional lithium fluoride (LiF:Mg,Ti) and the high-sensitivity material LiF:Mg,Cu,P were available, so permitting a comparison between the two types. Also available for the tests were Harshaw extremity EXT-RAD (LiF:Mg,Cu,
S T, Baker, P J, Gilvin
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Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2008
Abstract Two strong thermal peaks in the wavelength range 220–420 nm have been detected at 128 and 140 K in LiF:Mg,Cu, at 123 and 135 K in LiF:Mg,Cu,P and at 125 and 133 K in LiF:Mg,Cu,Si, respectively. The origin of these main TL peaks is discussed in terms of defect perturbed H–F and V K –e type recombination, respectively. The relative intensity
B. Yang, L. Wang, P.D. Townsend, H. Gao
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Abstract Two strong thermal peaks in the wavelength range 220–420 nm have been detected at 128 and 140 K in LiF:Mg,Cu, at 123 and 135 K in LiF:Mg,Cu,P and at 125 and 133 K in LiF:Mg,Cu,Si, respectively. The origin of these main TL peaks is discussed in terms of defect perturbed H–F and V K –e type recombination, respectively. The relative intensity
B. Yang, L. Wang, P.D. Townsend, H. Gao
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Thermoluminescent materials for medical applications: LiF:Mg,Ti and LiF:Mg,Cu,P
Radiation Measurements, 2006Thermoluminescent dosimeters are used in a variety of medical applications including radiation therapy, diagnostic radiology, and radiotherapy mailed dosimetry. For many years LiF:Mg,Ti has been dominating the field of TL medical dosimetry. In recent years, however, a relatively new material, LiF:Mg,Cu,P, has attracted the attention of the medical ...
M. Moscovitch, Y.S. Horowitz
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A study on thermal degradation of LiF:Mg,Cu,P and LiF:Mg,Cu,Si
Radiation Measurements, 2010Abstract We investigated the thermal degradation of LiF:Mg,Cu,P (NTL-250) and LiF:Mg,Cu,Si (MCS) for the development of TL sheet. By thermogravimetry and differential scanning calorimetry (TG-DSC), the exothermic reaction was observed between 320 °C and 400 °C in MCS as well as NTL-250.
Akiko Konnai, Naoto Ozasa, Jung-il Lee
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Radiation Protection Dosimetry, 2004
In this paper, the various models dealing with the effects of ionisation density on the thermoluminescence (TL) response (efficiency) of TL LiF dosemeters are discussed. These include (i) the Unified Interaction Model (UNIM), which models photon/electron linear/supralinear dose response; (ii) the Extended Track Interaction Model (ETIM), which models ...
Yigal, Horowitz, Pawel, Olko
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In this paper, the various models dealing with the effects of ionisation density on the thermoluminescence (TL) response (efficiency) of TL LiF dosemeters are discussed. These include (i) the Unified Interaction Model (UNIM), which models photon/electron linear/supralinear dose response; (ii) the Extended Track Interaction Model (ETIM), which models ...
Yigal, Horowitz, Pawel, Olko
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Medical Physics, 1997
This study compared the relative effectiveness of TLD crystals LiF:Mg,Ti (TLD‐100) and LiF:Mg,Cu,P (TLD‐700H) for clinical dosimetry, focusing on reproducibility, linearity, and energy response. Experimental results indicated that TLD‐700H was superior to TLD‐100 with regard to reproducibility, lack of supralinearity, and the absence of variation in TL
C K, Harris +3 more
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This study compared the relative effectiveness of TLD crystals LiF:Mg,Ti (TLD‐100) and LiF:Mg,Cu,P (TLD‐700H) for clinical dosimetry, focusing on reproducibility, linearity, and energy response. Experimental results indicated that TLD‐700H was superior to TLD‐100 with regard to reproducibility, lack of supralinearity, and the absence of variation in TL
C K, Harris +3 more
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