Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li2B4O7:Mn and Li2B4O7:Cu TL detectors in mammography radiation fields

    Access Status
    Fulltext not available
    Authors
    Fartaria, M.
    Reis, Claudia
    Pereira, J.
    Pereira, M.
    Cardoso, J.
    Santos, L.
    Oliveira, C.
    Holovey, V.
    Pascoal, A.
    Alves, J.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Fartaria, M. and Reis, C. and Pereira, J. and Pereira, M. and Cardoso, J. and Santos, L. and Oliveira, C. et al. 2016. Assessment of the mean glandular dose using LiF:Mg,Ti, LiF:Mg,Cu,P, Li2B4O7:Mn and Li2B4O7:Cu TL detectors in mammography radiation fields. Physics in Medicine and Biology. 61 (17): pp. 6384-6399.
    Source Title
    Phys Med Biol.
    DOI
    10.1088/0031-9155/61/17/6384
    School
    Department of Medical Radiation Sciences
    URI
    http://hdl.handle.net/20.500.11937/42621
    Collection
    • Curtin Research Publications
    Abstract

    The aim of this paper is the characterization of four thermoluminescence detectors (TLD), namely, LiF:Mg,Ti, LiF:Mg,Cu,P, Li2B4O7:Mn and Li2B4O7:Cu for the measurement of the entrance surface air kerma (ESAK) and estimation of the mean glandular dose (MGD) in digital mammography examinations at hospitals and clinics. Low-energy x-ray beams in the typical energy ranges of mammography, produced with a tungsten target and additional 60 µm molybdenum filtration were implemented and characterized at the Laboratory of Metrology of Ionizing Radiation at Instituto Superior Técnico. These beams were used for the characterization of the TLDs in terms of sensitivity, linearity, reproducibility, energy dependence and fading at 40 °C. The energy dependence test was further extended using clinical beams produced by mammography units at hospitals and clinics. The method proposed by the International Atomic Energy Agency was used for the measurement of ESAK and assessment of MGD. The combined standard uncertainty for the measurement of ESAK (and MGD) was determined in accordance to the Guide to the expression of uncertainty in measurement. The x-ray beams generated in the 23–40 kVp range presented HVL values from 0.36 to 0.46 mm Al. The beam produced at 28 kVp (HVL 0.39 mm Al) was considered as reference. The radiation field defined a circle with 84 mm diameter with a maximum variation of the beam intensity of less than 1% at the top flat (plateau) within 4 cm of the central axis. The estimated total uncertainty for the measurement of air kerma was 0.42%. All the TL detectors tested showed good performance except the commercial Li2B4O7:Mn (or TLD-800) which was excluded due to its poor sensitivity in our experimental set up. Both lithium fluorides showed better linearity and reproducibility as well as lower energy dependence and fading when compared to lithium borates. The stable behaviour of LiF:Mg,Ti and LiF:Mg,Cu,P detectors is reflected in the low combined standard uncertainty of  ±5.6% and  ±4.3% respectively (or  ±5.1% and  ±3.6% if fading is neglected). In general a total combined uncertainty lower than  ±10% for the measurement of ESAK was obtained for the four TL materials studied.

    Related items

    Showing items related by title, author, creator and subject.

    • Novel method for state selective determination of electron-impact-excitation cross sections from 0° to 180°
      Weyland, M.; Ren, X.; Pflüger, T.; Baek, W.; Bartschat, K.; Zatsarinny, O.; Fursa, Dmitry; Bray, Igor; Rabus, H.; Dorn, A. (2014)
      We use an improved target recoil momentum spectroscopy setup to determine differential cross sections for excited metastable state production in atoms and molecules by electron impact and show its capabilities for an ...
    • Polycrystalline materials analysis using the Maia pixelated energy-dispersive X-ray area detector
      Kirkwood, H.; de Jonge, M.; Howard, D.; Ryan, C.; van Riessen, G.; Hofmann, F.; Rowles, Matthew; Paradowska, A.; Abbey, B. (2017)
      Elemental, chemical, and structural analysis of polycrystalline materials at the micron scale is frequently carried out using microfocused synchrotron X-ray beams, sometimes on multiple instruments. The Maia pixelated ...
    • An investigation into active and passive acoustic techniques to study aggregating fish species
      Parsons, Miles James Gerard (2009)
      Techniques of single- and multi-beam active acoustics and the passive recording of fish vocalisations were employed to evaluate the benefits and limitations of each technique as a method for assessing and monitoring fish ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.