描述
KJ3004X1-BA1
顧名思義，電磁輻射就是電磁波的輻射，而電磁波是自然界中廣泛存在的能量傳遞形式。振蕩的電場(chǎng)和磁場(chǎng)在空間中以波的形式傳播，就形成了電磁波，X光、紫外線、紅外光、微波還有無(wú)線電波都是不同頻率（波長(zhǎng)）的電磁波。太陽(yáng)光也是特定頻率的電磁波，正是太陽(yáng)光傳遞的能量，才讓地球保持著適合生命生存繁衍的溫度。因此不難理解，跟太陽(yáng)光一樣，電磁波對(duì)人體的傷害程度，主要取決于其攜帶能量的大小。
那么，變電站產(chǎn)生的電磁波攜帶有多大的能量呢？答案是——這個(gè)問(wèn)題根本就不成立，因?yàn)樽冸娬編缀醪粫?huì)輻射出電磁波。
需要注意的是，電磁場(chǎng)不等于電磁波。的確，通電導(dǎo)線的周?chē)鷷?huì)產(chǎn)生電磁場(chǎng)，而交變的電磁場(chǎng)會(huì)輻射出電磁波，但這需要有一個(gè)前提——天線。按照天線理論，要想成為有效的輻射源，其天線必須具有與電磁場(chǎng)的工作波長(zhǎng)可比的長(zhǎng)度。輸電線和變電站的其它電力設(shè)備都使用50赫茲或者60赫茲的工頻（工業(yè)用交流電頻率），產(chǎn)生的是工頻電磁場(chǎng)（EMF）。這與動(dòng)輒達(dá)到千赫茲（KHz）乃至吉赫茲（GHz，即十億赫茲）的無(wú)線電信號(hào)完全不可同日而語(yǔ)。以手機(jī)為例，中國(guó)人最常用的移動(dòng)GSM信號(hào)頻率是900MHz，其波長(zhǎng)（光速/頻率）為33厘米，只靠手機(jī)的內(nèi)置天線就可以發(fā)射電磁波信號(hào)。而無(wú)線廣播的信號(hào)頻率要低一些，在87-108MHz之間，需要更長(zhǎng)的天線來(lái)收發(fā)。這就是為什么你的手機(jī)必須插上耳機(jī)才能接收調(diào)頻廣播——因?yàn)槭謾C(jī)需要以耳機(jī)線來(lái)替代天線。而對(duì)于50赫茲的工頻電磁場(chǎng)來(lái)說(shuō)，其工作波長(zhǎng)長(zhǎng)達(dá)6000km，相比之下短得可憐的輸電線根本無(wú)法構(gòu)成天線，也就無(wú)法在近距離內(nèi)輻射電磁波。多年的實(shí)際測(cè)量值也證實(shí)，110kV室內(nèi)變電站外電磁輻射強(qiáng)度測(cè)量值與背景值無(wú)異。EMF對(duì)人體的影響，最多是電磁場(chǎng)本身的潛在危害。有人認(rèn)為，由于生物機(jī)體內(nèi)部也有電場(chǎng)，外界的電場(chǎng)可能會(huì)對(duì)其產(chǎn)生影響，導(dǎo)致機(jī)體功能紊亂，但這一理論并未得到證實(shí)。要知道，生物體自身的電磁場(chǎng)至少要比EMF磁場(chǎng)強(qiáng)100倍。
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