The original particle that decays into platinum-193 and a positron is likely a radioactive isotope. When a radioactive isotope undergoes decay, it transforms into different elements or particles to achieve stability. In this case, the process involves the emission of a positron and the formation of platinum-193.
Here's a simplified breakdown of the decay process:
1. The original radioactive isotope undergoes radioactive decay.
2. During the decay, it emits a positron, which is a positively charged subatomic particle with the same mass as an electron but opposite charge.
3. Simultaneously, platinum-193 is formed as a result of the decay process.
Therefore, the original particle that undergoes decay and results in the formation of platinum-193 and a positron is a radioactive isotope.