Study on Tablet conversion by pressure-less sintering method on the thermoluminescent dosimetric response of Beta Tricalcium Phosphate

In this research work, commercial beta-tricalcium phosphate powder is converted into tablets by pressure-less sintering method. Thermoluminescence responses of tablet and powder samples in the dose range of ۲۰ to ۱۵۰۰ Gy have been compared and effective factors in tablet conversion such as mass in the range of ۳۰ to ۶۰ mg, force between ۱ to ۳ N, concentration of granulating solution and tablet diameter in the range of ۰.۴ to ۱۵ mm are investigated based on the results of dosimetric response and tablet hardness. The results show that by turning into tablets, the grain size increases, and the possibility of the first-order kinetics increases by the conversion of powders into tablets. It is possible to achieve a better dosimetric response than the it’s powder by applying suitable conditions for turning into tablets; also, the diameter of the sample can affect hardness, and it is better to make the tablets with a smaller size. Based on the results obtained from fading, reproducibility, sensitivity, peak shaping of the glow curve, and microhardness measurement, it can be seen that the samples that have been subjected to less pressure perform better and in order to achieve the desired results of converting to TLD dosimetry tablets, it is better to use more mass for tablets if more pressure is needed.

Keywords:

Dosimetry , Thermoluminescence , Pressureless sintering , calcium phosphate