radiative lifetime

例句：

1. 1. The radiative lifetime of the radioactive material is a critical factor in its decay.
   放射性物质的辐射寿命是其衰变的关键因素。
2. 2. The study of radiative lifetimes has led to significant advancements in radiation therapy.
   辐射寿命的研究已经导致了放射治疗的重大进步。
3. 3. The radiative lifetime of a radioactive substance depends on its isotopic composition and decay rate.
   放射性物质的辐射寿命取决于其同位素组成和衰变速率。