X-ray emission spectrometer

X-ray emission spectrometerIt is a key scientific instrument used to analyze the composition and chemical state of material elements. Its core principle is to achieve qualitative and quantitative analysis of elements by detecting the characteristic X-rays emitted by the excited material.

1、 Working principle

When high-energy particles (such as electron beams, X-rays, or gamma rays) bombard matter, the inner layer electrons of the atom are ejected, forming holes. When outer electrons transition to fill holes, they release X-ray photons of a specific energy that is only related to the atomic number of the element. By measuring the energy and intensity of these characteristic X-rays, the type and content of elements in the sample can be determined.

2、 Instrument composition

Source of excitement

Electron gun: emits high-energy electron beams to bombard the surface of the sample (such as the electron gun in scanning electron microscopy).

X-ray tube: produces one X-ray to excite the sample (such as the excitation source in an X-ray fluorescence spectrometer).

Synchrotron radiation source: provides high brightness and high resolution X-rays, suitable for cutting-edge scientific research.

detection system

Semiconductor detectors, such as Si (Li) detectors and Si PIN detectors, convert X-ray energy into electrical signals to achieve high-resolution spectral analysis.

Scintillation detector: converts X-rays into visible light through fluorescent substances, and amplifies the signal through a photomultiplier tube.

Energy Dispersive Spectroscopy (EDS): Simultaneously measuring X-rays across all energy ranges to quickly obtain multi-element information.

Wavelength dispersive spectroscopy (WDS): By using crystal spectroscopy to select specific wavelengths, it has higher accuracy but slower speed.

data processing system

Multi channel analyzer (MCA): Classify electrical signals by energy and generate energy spectra.

Software algorithm: perform peak recognition, background subtraction, and quantitative calculation on the energy spectrum (such as ZAF correction, considering atomic number, absorption, and fluorescence effects).

3、 Technical features

High sensitivity and resolution

Modern semiconductor detectors, such as Si PIN, can achieve low-power and high-resolution detection.

Simultaneous analysis of multiple elements

The energy spectrometer can detect all elements from boron (B) to uranium (U) at once, making it suitable for complex sample analysis.

Non destructive analysis

No need for chemical treatment of samples, suitable for cultural relic identification, environmental monitoring and other scenarios.

Micro area analysis capability

Combined with electron microscopy, element distribution imaging at the micrometer level can be achieved (such as line scanning and surface scanning).

4、 Application Fields

Materials Science

Analyze the elemental composition and distribution of metals, ceramics, and polymer materials to guide the development of new materials.

Geological and Mineral Exploration

Quickly determine the metal element content in ores to assist in resource assessment and mining.

environmental monitoring

Detect atmospheric particulate matter and heavy metal pollution (such as lead, mercury, arsenic) in soil.

Industrial non-destructive testing

Used for quality control of metal welding and electronic components, detecting internal defects or compositional deviations.

Astronomy and Space Exploration

Detecting the distribution of elements on the surface of planets and studying their evolution.

Biomedicine

Analyze trace elements (such as calcium, iron, zinc) in biological samples to assist in disease diagnosis.