| 单词 | gamma-ray altimeter |
| 释义 | gamma-ray altimeter [`gam·ǝ ´rā al`tim·ǝd·ǝr] ENGINEERING An altimeter, used at altitudes under several hundred feet, that measures the photon backscatter from the earth resulting from the transmission of photons to earth from a cobalt-60 gamma source in the plane. |
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