单词 | roentgen |
释义 | roentgen [`rent·gǝn] NUCLEONICS An exposure dose of x- or γ-radiation such that the electrons and positrons liberated by this radiation produce, in air, when stopped completely, ions carrying positive and negative charges of 2.58 × 10-4 coulomb per kilogram of air. Abbreviated R (formerly r). Also spelled röntgen. |
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