【摘要】 <正> 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。更多还原

【Abstract】 The alpha emiter 216Po has a half life of only 0.15 seconds comes immediately from 220Rn. The number of cascade pairs was counted by a special equipment and the cascade pairs counting rate thus obtained was served as a measure of the thorium contents in the sample. The validity of results was comfirmed.更多还原