陶器和瓷器中所含铀和钍的量在大多数情况下是很少的,针对这一特点,选用级联α-对法测定微量铀和钍。方法的优点是简便易行,用无限厚源,制样比较简单;探测元件采用ZnS屏,加上一套测定α-粒子的装置,要求它能够区分总的α-计数和级联α-计数。 For the most part, the amount of uranium and thorium contained in pottery and porcelain is very small. In response to this feature, cascading alpha-pair method is used to determine trace amounts of uranium and thorium. The advantage of this method is that it is simple and easy to use and the sample preparation is relatively simple with infinite thickness source. The detector element uses a ZnS screen, together with a set of devices for the determination of alpha-particles, which requires it to be able to distinguish the total alpha-count and the cascade alpha-count .