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Abstract
Dosimetry is a widespread material science field dealing with detection and quantification of ionizing radiation using electronic processes in materials. One of the main aspects that determines the performance of dosimeters is the type of defects the material contains. Crystalline lattice imperfections are formed around impurity ions, which may have a smaller or larger size, or different oxidation states compared to host ions. In this study, we show what effects Cr impurities have on the luminescent properties of alumina. Porous Al 2 O 3 : Cr microceramics synthesized using the sol-gel method showed a higher thermoluminescence response than a single crystal ruby. We have found that Cr 2 O 3 concentration of 0.2 wt% was optimal; it yielded the highest X-ray luminescence and thermostimulated luminescence readout of all studied additive concentrations added to alumina during synthesis. Our results show that Cr doped alumina could potentially be used as a promising new material for dosimetry of ionizing radiation.
Highlights
Personal and industrial dosimeters provide a possibility to determine the radiation dose emitted by ionizing sources and radioactive materials
Measurements repeated in the same conditions: temperature range and the delay time before the impact of thermostimulated luminescence (TL) fading; this sample was irradiated for 15 min, and a 60 min pause was taken irradiation and actual measurements were held constant
For peaks dosimetric applications, separate measurement it it had had after check theafter impact of TL fading; this sample was irradiated for 15 min, and a 60 min pause was taken before the TL readout
Summary
Personal and industrial dosimeters provide a possibility to determine the radiation dose emitted by ionizing sources and radioactive materials. Its main application is in OSL dosimetry for medicine, such as radiotherapy, radiodiagnostics, as well as heavy charged particle dosimetry [5]. It has very attractive properties such as high sensitivity, stable signal at RT (room temperature) and a linear response over a wide range of doses (up to 50 Gy), this material shows disadvantages such as dependence of TL response on heating rate and overresponse to low-energy X-rays due to the effective atomic number—11.28. Al2 O3 :C is useful in the dose range 10 μGy–10 Gy but is not suitable at higher doses
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