Mache (symbol ME from German Mache-Einheit, plural Maches) is a unit of volumic radioactivity named for the Austrian physicist Heinrich Mache.
[1] It was defined as the quantity of radon (ignoring its daughter isotopes; in practice, mostly radon-222) per litre of air which ionises a sustained current of 0.001 esu (0.001 StatAmpere).
This radioactivity–related article is a stub.
You can help Wikipedia by expanding it.This standards- or measurement-related article is a stub.
You can help Wikipedia by expanding it.