Microdosimetric interpretation of the photon energy response of LiF:Mg,Ti detectors

P. Olko, P. Bilski, J. L. Kim, Y. S. Horowitz, L. Oster

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

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 η = 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.

Original languageEnglish
Pages (from-to)119-122
Number of pages4
JournalRadiation Protection Dosimetry
Volume100
Issue number1-4
DOIs
StatePublished - 1 Jan 2002
Externally publishedYes

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