Thallium203

Thallium-203 is a stable isotope of the element thallium. It has 81 protons and 122 neutrons, giving it a total atomic mass of approximately 203 atomic mass units. Thallium-203 is the more abundant of the two naturally occurring stable isotopes of thallium, with thallium-205 being the other. In natural thallium, thallium-203 makes up about 29.5% of the elemental composition, while thallium-205 constitutes the remaining 70.5%.

This isotope is not radioactive and does not undergo radioactive decay. Its stability is a key characteristic that distinguishes it from the numerous radioactive isotopes of thallium, some of which have significant medical or industrial applications due to their radioactivity. Thallium-203 is typically found in trace amounts in the Earth's crust and is not considered a significant environmental hazard in its natural isotopic form.

Research involving stable isotopes like thallium-203 often focuses on their use as tracers in scientific studies. For instance, in geology or environmental science, thallium-203 can be used to track the movement of materials or to understand geological processes. Its stable nature ensures that it does not introduce radioactivity into the system being studied, simplifying analysis and reducing safety concerns.