Print version ISSN 1516-1439
CARVALHO JUNIOR, Álvaro Barbosa de; BARROS, Thiago Fernandes; GUZZO, Pedro Luiz and KHOURY, Helen Jamil. Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry. Mat. Res. [online]. 2012, vol.15, n.4, pp. 536-543. Epub July 10, 2012. ISSN 1516-1439. http://dx.doi.org/10.1590/S1516-14392012005000075.
This paper describes the manufacturing process of quartz-pellets and shows their potential use as thermoluminescence dosimeters (TLD) for those applications where low-levels of ionising radiation are present. Two batches of cold-pressed pellets were produced and their resistance were evaluated by vibration tests and weight-loss measurements. The batch manufactured with 75 × 150 µm particles showed enough resistance to be employed as TLD. The dosimetric properties of the 310 °C peak appearing in the glow curves of these pellets were characterized together with commercial TLD-100 units using γ- and X-ray beams with different energies. The uncertainties related to reproducibility and stability of the TL signal were better than 10%. The sensitivity and the linearity of the TL response of quartz-pellets were better than that measured for TLD-100 for doses ranging from 0.5 to 200 mGy. The energy dependence of the quartz-pellets was higher than that of TLD-100 but it cannot be considered a restriction to their use in clinical procedures and industrial applications.
Keywords : quartz; cold-pressed pellets; thermoluminescence; radiation dosimetry.