- Industri: Education
- Number of terms: 3412
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Harvard University is the oldest institution of higher learning in the United States. It was established in 1636 by the Massachusetts legislature and named after its first benefactor, John Harvard. Located in Cambridge, Massachusetts, Harvard University is an Ivy League university.
穿透電磁輻射 (光子) 有一個是遠短于可見光的波長。他們可以由周圍某些原子核 (特性的 x 光片) 電子勵磁或與原子核周圍的電場的高速電子相互作用產生的 。
Industry:Environment
通常的人造的密封輻射在舌癌,攝影,作為電源的電池,校準,或各種工業儀錶中使用的源。機器比如加速器、 放射性同位素髮電機,並天然放射性核素可能被視為來源。
Industry:Environment