Mache (symbol ME from German Mache-Einheit, plural Maches) is an obsolete unit of volumic radioactivity named for the Austrian physicist Heinrich Mache. It was defined as the quantity of radon (ignoring its daughters; in practice, mostly radon-222) per litre of air which ionises a sustained current of 0.001 esu (0.001 StatAmpere).
- Riezler, Wolfgang (1950). Einführung in die Kernphysik (4 ed.). H. Hübener. p. 49. Retrieved 2009-09-25.
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