alpha source inside human body

Question

I know that ionizing power of alpha source is very high.However,alpha source have short range,it will lose energy quickly.Why people always said that alpha sourceinside the human body is the most dangerous.Also,what will happen if alpha source is inside the human body?

Answer 1

alpha ray因為有large size所以得short range.佢地好容易會collide其他molecules(例如空氣粒子),therefore,佢地的KE係好易被轉化,佢地好易ionize其他molecules.相比之下,beta同gamma對其他molecules的影響可以話係好少(想像一下cloud chamber的圖象吧)
但係,對人體有害的,係ionizing power,而唔係penetrating power.
alpha如果係人體內,ionize身體組織,當然係有害,雖然alpha range short,但係佢雖然short,都足夠reach我地身體ge組織, 對比一下其他radiation,致電離能力無咁大,雖然射程遠,但係反而對身體組織影響無咁大,因為佢地無對我地身體組織ionize/只係ionize好少,同alpha無得比
情況有少少似,一個人俾紙飛機飛中.同俾一塊石頭飛中 紙飛機飛得比一塊重的石頭遠,but 傷害唔係只睇射程, 而係要睇source對object的影響.(例子唔太好,見諒)

切記alpha short range係因為轉化得快

2007-01-16 02:03:06 補充：
what will happen if alpha source is inside the human body?我相信部份相關身體組織/細胞會被ionized.....直接受到傷害什至會留下後患,,始終radiation對人體唔好,有可能有一般中輻射的後果純粹個人意見

Answer 2

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