- SiLi detectors: These have the best resolution, but require liquid nitrogen cooling to maintain their stability.
- Si-PIN photodiodes (formed from p-type/intrinsic/n-type semiconductor): These can be cooled using Peltier devices, are less expensive, but do not have as a good a resolution as the SiLi detectors. These detectors form the majority of the systems evaluated here.
- Proportional counters: These use photo-ionization of gases within the counters, to detect the X-rays. They are the least expensive of the options explored in this study and are widely used in the PCB fabrication industry for plating thickness measurements.
