Measuring the energy output of x-ray sources

摘要

A detector head (10) for measuring the energy of x-rays emitted from a source. The head (10) comprises a linear array of photodiode detector devices (23) each positioned beneath a respective x-ray attenuation window (16). Preferably seven pairs of detector devices (23) are provided symmetrically arranged about an axis, each pair for detecting x-rays through an attenuating filter (16) of different thickness to the other pair.