# Glassy carbon

Glassy carbon is a secondary standard sample for absolute intensity calibration. It is an ideal material for this goal, since it is stable, easy to handle (1 mm thick small, solid plate), and withstands environmental stress well (not sensitive for temperature, humidity, effets of radiation damage are negligible). Its scattering curve (presented in the figure below) features a long, shallow plateau, which renders a scaling operation numerically stable.