Ytterbium.
169Yb is the isotope Ytterbium, it is used in medical and industrial radiography, it is a source of radiation among others for portable radiographic devices when there is no electricity available.
Ytterbium.
169Yb is the isotope Ytterbium, it is used in medical and industrial radiography, it is a source of radiation among others for portable radiographic devices when there is no electricity available.