Answer :

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.