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半衰期与我们的生活密切相关.本文通过实例解析半衰期的物理意义,探讨半衰期在STSE(科学、技术、社会、环境)中的应用.一、半衰期的理解1.定义:大量的放射性原子核有半数发生衰变所用的时间.2.物理意义:描述放射性元素衰变的快慢.3.决定因素:只由原子核内部自身因素决定,跟原子所处的物理状态(如温度、压强)或化学状态(如单质、化合物)无关.例1恒星内部发生着各种热核反应,如“氦燃
Half-life is closely related to our life.This paper analyzes the use of half-life in STSE (science, technology, society, environment) by analyzing the physical meaning of half-life through examples.First, the understanding of half-life 1. Definition: Half of a large number of radioactive nuclei occur Decay time .2 Physical meaning: Describe the decay of radioactive elements .3 decisive factors: only by the nuclear internal factors, with the atomic physical state (such as temperature, pressure) or chemical state (such as simple substance, Compounds.) Example 1 A variety of thermonuclear reactions occur within a star, such as ”helium burning."