radio active element

樓上有問題嗎
如果所有東西都是放射性的，你早就死了
鑽石是碳較不穩定的異構體，所以有衰變產生
而石墨則很穩定

說回正題
化學家(正確來說，做幅射的實驗的通常是物理學家)
會穿防護衣，抵擋幅射

這裏可以幫到你
http://actioni.w7.c361.net/yahoo.com.hk/hk/auction/178987536

其實好多野都有微量輻射，但係radioactive 就即係放射性，radioactive element 即係放射性元素 e.g. hydrogen, carbon
通常都係有isotope 既 element or 人造元素 e.g. thorium, uranium

son, everything is radio active. If you put a crystal of diamond on bench, 4000 years later only half of the diamond remain, (the slogan "diamonds are forever" is a lie!). What kind of experiment are you talking about? Do you want to know specifically radioactive experiment?