Comparison of LiF (TLD-100 and TLD-100H) detectors for extremity monitoring

• Published in: Radiation measurements Vol. 43; no. 2; pp. 646 - 650
• Main Authors: Freire, L., Calado, A., Cardoso, J.V., Santos, L.M., Alves, J.G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01-02-2008; Elsevier
• Subjects: Earth sciences; Earth, ocean, space; Exact sciences and technology; Extremity dosemeters; Geochronology; Individual monitoring; Isotope geochemistry. Geochronology; Thermoluminescence; Extremity dosemeters; Individual monitoring; Thermoluminescence; fluorides; X-rays; monitoring; halides; homogeneity; lithium; radiation; tomography; thermoluminescence; calibration; performances; energy
• ISSN: 1350-4487; 1879-0925
• DOI: 10.1016/j.radmeas.2007.12.013

In this work the results aimed at assessing the performance of two types of LiF detectors, TLD-100 and TLD-100H, used in the context of extremity dosimetry are presented. Each detector variety was studied for reproducibility, batch homogeneity, residual dose, linearity and energy dependence using, when appropriate, the
90Sr/
90Y radiation source built-in one of the Harshaw 6600 readers, the ISO narrow X-ray beams of N30, N40, N60, N80, N100 and N120 or the gamma radiations of
137Cs and
60Co. Two calibration energies (N120 and
137Cs) were also used. The reproducibility and linearity results indicate that both LiF:Mg,Ti and LiF:Mg,Cu,P performed equally well. However, LiF:Mg,Cu,P presents a higher residual signal. In terms of energy dependence, LiF:Mg,Cu,P shows less variation than LiF:Mg,Ti particularly when N120 is used as calibration radiation. This seems to be a more realistic setup since the energy of the most frequently used radioisotopes in Nuclear Medicine departments with single photon emission computed tomography (SPECT) use gamma radiation energies closer to N120 than to
137Cs.