| 单词 | radioactive element |
| 释义 | radioactive element Levels of the radioactive element caesium-137 are 300 times higher than the legal limit for human consumption. Times, Sunday Times The radioactive element was placed in lead canisters and put in the back of a car, to be driven inconspicuously to the capital. Times, Sunday Times It also showed that a radioactive element may have more than one atomic mass though the chemical properties are identical. Retrieved from Wikipedia CC BY-SA 3.0 Working with the mineral pitchblende, the pair discovered a new radioactive element in 1898. Retrieved from Wikipedia CC BY-SA 3.0 The luminous dial or betalight contained the mildly radioactive element tritium, which later caused some concern about safety. Retrieved from Wikipedia CC BY-SA 3.0 |
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