Characterization of CaF2:Dy (TLD-200) dosimeters and determination of dosimetric quantities in mammography

AŞLAR E.

RADIATION MEASUREMENTS, cilt.154, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 154
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.radmeas.2022.106779
  • Dergi Adı: RADIATION MEASUREMENTS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Chemical Abstracts Core, Compendex, INSPEC, Pollution Abstracts
  • Anahtar Kelimeler: CaF2, TLD-200, Entrance surface dose (ESD), Mean glandular dose (MGD), Mammography, ANGULAR-DEPENDENCE, THERMOLUMINESCENCE, PHANTOM, QUALITY, CAF2-DY, BEAM, TL
  • Ankara Üniversitesi Adresli: Evet

Özet

This study aimed to characterize CaF2:Dy (TLD-200) thermoluminescence dosimeter (TLD) in mammography, and to determine entrance surface dose (ESD), relative depth dose (RDD), and mean glandular dose (MGD) values. The angular and energy dependencies, dose-response, and TL intensity reproducibility characteristics of dosimeters were investigated. The dosimeters showed a linear dose-response behavior corresponding to air kerma values ranging between 2.11 and 21.98 mGy and a reproducibility of +/- 5%. The response of the dosimeters showed by ~48% over response when the tube potential increased from 22 to 32 kVp, indicating that they have a substantial energy dependence. On the other hand, the TL intensity at 90? decreased by 70% compared with that at 0?, when the angular dependence of dosimeters was investigated. The ESD and MGD values obtained for both polymethyl methacrylate (PMMA) and BR-12 phantoms were compatible with existing literature, and the MGD values were also agreed with the European Federation of Organisations for Medical Physics (EFOMP). The RDD value decreased by nearly 90% at 6 cm depth. These dosimetric quantities did not change considerably for PMMA and BR-12 phantoms. The results showed that TLD-200 could be used as an alternative dosimeter in mammography to determine dosimetric quantities.