SYNTHESIS AND CHARACTERIZATION OF THERMOLUMINESCENCE MATERIAL AS RADIATION DOSIMETER BASED ON NON-TISSUE EQUIVALENT AND TISSUE EQUIVALENT PROPERTIES

• Main Author: Nuraeni, Nunung
• Format: Dissertations
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/41599
• Institution: Institut Teknologi Bandung

The utilization of radiation as a supporting tool in medical and industry were currently growing rapidly. Therefore, it is necessary to conduct radiation monitoring for workers involved in using radiation sources. Radiation monitoring devices commonly used was TLD (Thermo Luminescence Dosimetre). But its availability still depends on imports. To overcome the lack of TLD, in this study TLD non-tissue equivalent and tissue equivalent were developed to reduce dependence on imported TLD. Researchers synthesized TLD non-tissue equivalent (CaSO4: Dy and CaSO4: Tm) and tissue equivalent (Li2B4O7: Cu) using the co-precipitation method. The researcher analyzed the thermoluminescence properties of TLD by varying the re-annealing temperature, dopant concentration, and the addition of PTFE / SiO2 / urea. The results of X-ray diffraction (XRD) analysis indicate that CaSO4 crystals have been formed in accordance with JCPDS no. 37-1496 and crystals Li2B4O7: Cu in accordance with JCPDS No. 01-084-2191. Re-annealing at 700 ?C changes the morphology and size of crystals of CaSO4: Dy and CaSO4: Tm becomes smaller. The addition of PTFE also changed the morphology of CaSO4: Dy/Tm and Li2B4O7: Cu. Addition of doping concentration (0.2 mol%) to CaSO4: Dy/Tm resulted in a decrease in thermoluminescence intensity. The ? radiation source produces a thermoluminescence response greater than the ? radiation source. Increase in re-annealing temperature (400-900 ?C) to CaSO4: Dy/Tm+PTFE increases thermoluminescence response. The highest thermoluminescence response occurs at 700 ?C whereas for a mixture of CaSO4: Dy and CaSO4: Tm with SiO2 there has not been a significant thermoluminescence response. Thermoluminescence response of Li2B4O7: Cu was observed for variations in doping concentration of 0.05 wt%, 0.1 wt% and 0.3 wt%. The highest thermoluminescence response occurred at doping concentrations of 0.1 wt%. The addition of PTFE / urea with a concentration of 0.5 wt%, 0.67 wt% and 0.75 wt% was also observed. Addition of urea to Li2B4O7: Cu resulted in a thermoluminescence response better than the addition of PTFE. The obtained TLD (CaSO4: Dy + PTFE) compared with TLD-900 Harshaw and TLD BARC commercially produced better thermoluminescence responses. The glow curve of obtained TLD and TLD-900 were still in the measurement temperature range of 50 - 260 ?C, TLD BARC glow curve has a truncated part in the measurement range.