Patent ID: 8222600

Claim:
A charged particle detection system for selectively detecting charged particles produced due to operation of a charged particle beam column irradiating a specimen, comprising: a proximal grid being selectively electrically biasable and configured for controllably directing said charged particles by electrically focusing the charged particles to compel selected secondary charged particles, whereupon being selected from said charged particles, to be attracted thereto, and to repel unselected secondary charged particles therefrom; a distal grid spaced apart from the proximal grid and separated therefrom by a gap, the distal grid being selectively electrically biasable and configured for attracting said selected secondary charged particles and/or selected tertiary charged particles, whereupon being selected from said charged particles, to said distal grid, and to repel unselected tertiary charged particles therefrom; and a charged particle detector configured for detecting the selected secondary charged particles attracted to said proximal grid and/or said distal grid and for detecting the selected tertiary charged particles attracted to said distal grid, that impinge thereupon.