beam current in in situ microanalysis

The number of primary electrons reaching the surface of the specimen per unit time expressed as electrical current. Recommended symbol: $i B$ ; unit: $A$ ; typical range: $nA$ . Recommended measurement technique: Faraday cage.

Source:

PAC, 1983, 55, 2023 (Nomenclature, symbols and units recommended for in situ microanalysis (Provisional)) on page 2026