Since the 1970s, new semiconductor detectors have been developed (silicon or germanium doped with lithium: Si(Li) or Ge(Li), which allows to detect directly X-ray energy spectrum. This method is called energy dispersive X-ray spectroscopy (EDX or EDS).
The principle of operation is based on the absorption of X-ray photon in special semiconductor structure and direct correlation between amplitude of resulted electric signal to energy of the X-ray photon. This provides possibility of spectral analysis of absorbed X-rays. Such detectors are sometimes called solid state X-Ray detectors.
Devices based on the detection principle find many applications now – X-ray Fluorescence Analyzers (RFA). The use of these analytical methods and equipment is wide from mining and industries (analysis of the composition of the materials), science (electron microscopy, etc.) to military applications and security needs.
The great impact to the X-ray spectroscopy method was done with development of special semiconductor structures of the detectors which made possible applications of the method very wide - from Si-PIN to Silicon Drift Detectors (SDD) and CdTe detectors.
Unlike conventional X-ray detectors, such as Si(Li), new semiconductor structures do not need cooling with liquid nitrogen. Relatively slight cooling to -20…-50°C is enough to provide perfect performance of X-ray detectors.
Here it does not need rejecting large amount of heat. These detectors have low power and emit little heat. However, they should be cooled: the lower the temperature, the better detector performance.
Cooling solves several tasks:
The most successful for these tasks is to use thermoelectric Peltier coolers (TECs). It makes semiconductor x-ray detectors miniature, affordable and greatly expanded their scope of applications.
TECs have unique reliability of several hundred thousand hours of continuous operation. It is more than 20-25 years of operation without maintenance and replacement, which is important for telecommunication systems.
The company RMT produces several series of multi-stage TECs suitable for in X-ray detectors.
The most popular packages for state-of-art X-ray detectors are TO-Style packages. The company RMT offers complete solutions – thermoelectric cooling modules mounted in standard or customized -style packages suitable for X-ray detectors.
To select a suitable solution and the optimal TEC for an application, the supporting is available at RMT’s website. For detailed modeling and calculations the company RMT provides our customers by free software or .And for advice and assistance.