engleski

Energy dependence characteristics of new TLDs in terms of Hp(10) values.

In our previous work, the energy dependence characteristics for several types of the most interesting “tissue-equivalent” thermoluminescent detectors (TLDs) were investigated. Irradiations were performed “in air” and energy dependence was determinated as a characteristic of the TL detector material itself. The aim of this work was to determine energy dependence characteristics in terms of the personal dose equivalent Hp(10) values. For this reason detectors during the irradiation were placed on the adequate phantom. The following types of TLDs were investigated: a) two new types based on lithium borate: Li2B4O7:Cu,In and Li2B4O7:Cu,In,Ag; b) two types of the highly sensitive LiF:Mg,Cu,P material: TLD-700H and GR 200A, c) two well known types of LiF:Mg,Ti detectors: TLD-100 and TLD-700 and d) the highly sensitive Al2O3:C detectors. TLDs previously calibrated with 137Cs gamma rays, were simultaneously irradiated with X ray beams in the range of effective energies between 33 and 116 keV. The irradiations were performed with detectors in PMMA holders placed on the 30 cm x 30 cm x 15 cm water phantom with PMMA walls (ISO phantom). Measured energy responses were compared with calculated data for Hp(10) values. The results confirmed the good tissue equivalence characteristics of the lithium borate based detectors. Also, it was shown that the calibration procedure must be adjusted according to the energy absorption characteristics of the individual dosemeter type.

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