pcante
Vatican City State (Holy See)
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镭
镭，是一种化學元素。其化學符號为Ra，原子序數为88。鐳是元素週期表2A族中最重的元素，是一種銀白色有光澤的放射性鹼土金屬，在空气中會迅速和氮气（而非氧气）反应，形成黑色的氮化镭（Ra3N2）。镭的同位素均有强放射性，其中以镭-226最为稳定，半衰期為1600年，會衰变成氡-222。镭衰变时会产生游离辐射，可以激发荧光物质，导致辐射发光。

1898年，镭以氯化镭的形式由皮埃尔·居里和玛丽·居里发现。二人从沥青铀矿中提取镭化合物，五天后在法国科学院发表成果。镭金属则是玛丽·居里和安德烈-路易·德比埃尔内通过电解氯化镭，于1911年分离的。

在自然界中，镭可以在铀矿和钍矿中做為衰變產物痕量生成，每吨沥青铀矿中只有七分之一克镭。镭对生物并非必需，且由于其放射性和反应性，进入生物体内可能危害健康。目前镭除了用于核医学以外没有商业用途。镭曾在辐射发光装置中用作放射源，也有“放射性庸医”利用其所谓的治疗能力。如今，镭的毒性已经广为人知，镭治疗因此不再流行，辐射发光设备也转用较安全的同位素。

镭的放射性能够致癌，也能够治療癌症
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Left 4 Dead 2
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Corrinoscopy 25 Feb @ 7:52pm 
i am become meme
sogagette 25 Feb @ 10:58am 
i am become meme
Lifted Truck 14 Jan @ 12:48pm 
Oante
Pogmaster 13 Jan @ 5:08pm 
pcante
tiktok dizisi 8 Jan @ 9:48am 
SENİ SİKİYORUM KARDEŞİM!

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HATA! Gerçek İslam kardeşliği asla yok edilemez! ☪ Seni asla sikemem kardeşim! Bunu diğer 10 ﷲAllahﷲ yolunda cihat için canını verecek müminle paylaş kardeşim! Yoksa bir daha asla ☁️Kardeş☁️ olarak çağırılmayacaksın!

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sogagette 9 Nov, 2024 @ 11:29am 
你okay吗？