Microdosimetric interpretation of the photon energy response of LiF:Mg,Ti detectors.
Photon energy response of MTS-N (LiF:Mg,Ti) detectors (TLD Poland) and of MTS-N detectors sensitised with 200 Gy of 60Co gamma rays, followed by UV irradiation (sMTS-N), has been determined using X rays with narrow energy spectra, in the energy range from 20 to 300 keV. The over-response of LiF:Mg,Ti detectors for X rays (relative TL efficiency eta = 1.1) can be explained as an ionisation density effect. Low energy X rays produce short electron tracks, which locally deposit a high radiation dose and, consequently, lead to an enhanced (supralinear) response. This over-response has not been observed in sensitised MTS-N where supralinearity in the response after gamma ray doses above 1 Gy is not seen. Using the dose-response curves measured for MTS-N detectors after 137Cs gamma ray irradiation and local doses calculated using Monte Carlo generated electron tracks, it was possible to predict the relative TL effectiveness for different X ray energies. The calculation procedure can be applied to predict the photon energy response of LiF:Mg,Ti detectors in an arbitrary photon field.
Olko
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Institute of Nuclear Physics, Kraków, Poland. Pawel.olko@alf.ifj.edu.pl
Bilski
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Kim
J L
JL
D005459:Fluorides / Q000737:chemistry / Q000528:radiation effects*; D005720:Gamma Rays; D018020:Lithium Compounds / Q000737:chemistry / Q000528:radiation effects*; D008274:Magnesium / Q000737:chemistry; D017785:Photons; D011854:Radiochemistry; D013819:Thermoluminescent Dosimetry / Q000379:methods* / Q000706:statistics & numerical data; D014025:Titanium / Q000737:chemistry; D014466:Ultraviolet Rays; D014965:X-Rays
D018020:Lithium Compounds; C027651:lithium fluoride; D014025:Titanium; D008274:Magnesium; D005459:Fluorides