谈及放射性物品,一般人会觉得它对人体是有害的,唯恐避之而不及。事实上,放射性物品与人类生活关系极为密切,它可广泛地应用于工业生产、农业生产、科学研究、医疗卫生、军事和公安等方面。比如,利用放射性同位素辐射出的射线具有穿透性这一点,可制成各种测定仪表。我们经常见到的火灾报警器就是其中的一种。再比如,机动车辆机件大多需要承受压力,它们大部分是 When it comes to radioactive materials, most people think it is harmful to the human body, just to avoid it. In fact, radioactive materials are closely related to human life. They can be widely used in industrial production, agricultural production, scientific research, medical and health care, military affairs and public security. For example, the use of radioactive isotope radiation rays penetrated this point, can be made of a variety of measuring instruments. One of them is the fire alarm we often see. As another example, most parts of motor vehicles need to withstand the pressure, most of them