radioactivity
US /ˌredioækˈtɪvɪti/
・UK /ˌreɪdɪəʊæk'tɪvətɪ/
B2 中高級
n. (u.)不可數名詞放射能；放射現象
The radioactivity of uranium makes it a potential source of nuclear energy
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核能可怕的3個原因!2/3 (3 Reasons Why Nuclear Energy Is Terrible! 2/3)
04:10
- amounts of radioactivity into the environment.
但有四件意外釋放出可觀的放射性物質到周遭環境
化妝品對身體好嗎？ (Is Makeup Bad For You?)
03:03
- promising a youthful glow—until the harmful effects of exposure to radioactivity was discovered, that is.
聲稱用了之後氣色會變得更年輕，直到被發現鐳對人體有害才停止流通。
其他星球上的生命可能需要輻射才能茁壯成長，原因是什麼？ (Life on Other Planets May Need Radiation to Thrive, Here’s Why)
05:07
- At first glance, you would not think that high radioactivity would make a planet ideal
乍一看，你不會認為高放射性會使一個星球成為理想的地方。
- They modeled three different sources of heat for a starless planet: radioactivity from
他們為一顆無星的行星建立了三種不同的熱源模型：來自宇宙中的放射性物質。
美國曆史上最大的放射性洩漏事件 (The biggest radioactive spill in US history)
12:33
- And the importance of protecting mine workers from radioactivity was well documented.
而保護礦工不受放射性影響的重要性，也是有據可查的。
- One government report showed radioactivity levels in the Puerco at over one thousand times what is allowed in drinking water.
一份政府報告顯示，普洱市的放射性水準是飲用水允許值的一千多倍。
如果我們用核彈對付颶風呢？ (What If We Nuked A Hurricane?)
03:53
- And you could detect the radioactivity in fish
你可以檢測到魚體內的放射性物質
電影和電視是如何搞錯輻射病的？ (How Movies and TV Get Radiation Sickness Wrong)
10:41
- still in a person's body, after 8 days, it's lost half of its radioactivity.
8 天後仍在人體內，也會失去其一半的輻射。
- But it takes almost two months for it to lose 99% of its radioactivity, and other radioactive
但這幾乎要兩個月才能讓 99% 的輻射消失，而其他放射性元素
