1、電離輻射鉛門(men)是(shi)一切能引(yin)起(qi)物質電離的輻射，而電磁輻射是(shi)由空間(jian)共同移送的電能量(liang)和磁能量(liang)所組成。
2、電(dian)(dian)離輻(fu)(fu)射(she)(she)存在于自然(ran)界，但目(mu)前人(ren)工輻(fu)(fu)射(she)(she)已(yi)遍及各(ge)個(ge)領域，專門從事(shi)生產、使用(yong)及研究電(dian)(dian)離輻(fu)(fu)射(she)(she)工作(zuo)的(de)，稱為放(fang)射(she)(she)工作(zuo)人(ren)員。而電(dian)(dian)磁(ci)輻(fu)(fu)射(she)(she)的(de)來源有(you)多種。人(ren)體內外均布(bu)滿由(you)天然(ran)和人(ren)造輻(fu)(fu)射(she)(she)源所發出(chu)的(de)電(dian)(dian)能量(liang)和磁(ci)能量(liang)；閃電(dian)(dian)便是天然(ran)輻(fu)(fu)射(she)(she)源的(de)例子之一(yi)。至(zhi)于人(ren)造輻(fu)(fu)射(she)(she)源，則(ze)包括微波爐、收(shou)音(yin)機、電(dian)(dian)視廣(guang)播發射(she)(she)機和衛(wei)星通(tong)訊裝置等。
3、電(dian)離(li)輻(fu)射(she)(she)對人(ren)體(ti)內組織(zhi)破壞能(neng)力(li)較大。由于其質量較大，穿透能(neng)力(li)差(cha)，在(zai)空氣中的(de)射(she)(she)程只有及厘米，只要一(yi)張紙或健康的(de)皮膚(fu)就能(neng)擋住。電(dian)磁(ci)輻(fu)射(she)(she)就不一(yi)樣了，電(dian)磁(ci)輻(fu)射(she)(she)對人(ren)體(ti)的(de)危害十分大，1999年5月8日(ri)閉幕的(de)全國電(dian)磁(ci)輻(fu)射(she)(she)環境污染源的(de)現狀：廣播電(dian)視發(fa)射(she)(she)設備(bei)(bei)共10235臺，總功率130萬千瓦；工科醫療設備(bei)(bei)共15335臺，地(di)球衛星3個，大哥大基站總數近萬個；空中蛛網(wang)一(yi)樣的(de)高壓輸變電(dian)線等(deng)都(dou)在(zai)向(xiang)外發(fa)射(she)(she)泄(xie)漏電(dian)磁(ci)波。
4、電(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)輻(fu)(fu)射(she)的(de)強度(du)與兩個因素密切相關(guan)，即距(ju)離(li)和時(shi)(shi)間。日(ri)常(chang)生活中(zhong)使(shi)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)時(shi)(shi)要注意(yi)一些方法，也能起到(dao)防輻(fu)(fu)射(she)效果(guo)。比如，不(bu)要把家用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)擺(bai)放得(de)過于集中(zhong)或經(jing)常(chang)在一起使(shi)用(yong)(yong)。在臥室(shi)里盡量(liang)不(bu)要擺(bai)放電(dian)(dian)(dian)(dian)(dian)(dian)腦、電(dian)(dian)(dian)(dian)(dian)(dian)冰(bing)箱等(deng)電(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)輻(fu)(fu)射(she)較強的(de)家電(dian)(dian)(dian)(dian)(dian)(dian)。使(shi)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)腦時(shi)(shi)，要與電(dian)(dian)(dian)(dian)(dian)(dian)腦屏幕(mu)保持(chi)適當距(ju)離(li)，較好(hao)(hao)是(shi)在0.5米(mi)以(yi)外(wai)，距(ju)離(li)越(yue)近，輻(fu)(fu)射(she)越(yue)強。屏幕(mu)亮度(du)也不(bu)要調得(de)過高(gao)，屏幕(mu)越(yue)亮，輻(fu)(fu)射(she)越(yue)強。使(shi)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)腦后應及(ji)時(shi)(shi)洗(xi)臉洗(xi)手，因為電(dian)(dian)(dian)(dian)(dian)(dian)腦顯(xian)示器(qi)(qi)表面(mian)存在著(zhu)大量(liang)靜(jing)電(dian)(dian)(dian)(dian)(dian)(dian)，其聚集的(de)灰塵會落(luo)到(dao)皮(pi)膚裸露處。另外(wai)，接手機時(shi)(shi)不(bu)要急。手機在接通瞬間以(yi)及(ji)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)通話，釋放的(de)電(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)輻(fu)(fu)射(she)較大，較好(hao)(hao)在按下接通鍵兩三秒再接聽。