activation analysis

/AE0 K T AH0 V EY1 SH AH0 N AH0 N AE0 L AH0 S AH0 S/
noun
  1. 1

    Any of several similar techniques in which a subatomic particle or gamma ray is captured by a nuclide to form a second stable nuclide which is then measured.

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Source: https://en.wiktionary.org/wiki/activation%20analysis