Why you use liquid nitrogen in eds detector?

Answer 1

The ED spectrometer is comprised of a liquid nitrogen (LN2) dewar, Si crystal, and preamplifier. The special Si crystal is mounted at the end of the detector located closest to the specimen. When X-rays strike the Si crystal very small signals are produced. These signals are amplified in the detector and sent on to the analysis electronics in the computer for further processing. The crystal is cooled by a cold finger, an extension of the LN2 dewar. Liquid nitrogen cools and therefore stabilizes the electronic properties of the crystal, improving the measurements of minute X-ray signals.

Answer 2

Liquid nitrogen is often used in EDS detectors because it helps to cool the detector element, typically a silicon drift detector, to very low temperatures. Cooling the detector improves its sensitivity and reduces electronic noise, resulting in better resolution and signal-to-noise ratios for detecting X-ray emissions from the sample.