Skin looks like nothing to alpha beam.

Skin looks like nothing to alpha beam. Skin can't block alpha. 

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對啊...皮膚擋alpha 射線? 記得著名的盧瑟福的背反射實驗嗎? -季襄- 給 季襄 發送悄悄話 (142 bytes) () 03/18/2011 postreply 14:37:54

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