Cartesian geometry energy dispersive X-ray fluorescence spectrometer

For rapid qualitative and quantitative elemental analysis


Rigaku NEX CG delivers rapid qualitative and quantitative determination of major and minor atomic elements in a wide variety of sample types — with minimal standards.

Cartesian geometry for trace level sensitivity

optical schematic

Unlike conventional EDXRF analyzers, the NEX CG was engineered with a unique close-coupled Cartesian Geometry (CG) optical kernel that dramatically increases signal-to-noise. By using monochromatic secondary target excitation, instead of convention direct excitation, sensitivity is further improved. The resulting dramatic reduction in background noise, and simultaneous increase in element peaks, result in a spectrometer capable of routine trace element analysis even in difficult sample types.

Novel software reduces the need for standards

NEX CG is powered by a new qualitative and quantitative analytical software, RPF-SQX, that features Rigaku Profile Fitting (RPF) technology. The software allows semi-quantitative analysis of almost all sample types without standards — and rigorous quantitative analysis with standards.

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  • Analyze ₁₁Na to ₉₂U non-destructively
  • Solids, liquids, powders and thin films
  • Polarized excitation for lower detection limits
  • Novel treatment of peak overlap reduces errors
  • PPB detection limits for aqueous samples using UltraCarry
  • Simplified user interface with EZ Analysis

NEX CG specifications

  • X-ray tube with Pd anode
  • 50W max power
  • 50kV max voltage
  • Four standard polarization and secondary targets depending
    on application, for optimum excitation
  • Optional fifth target for optimal excitation of Na and Mg


  • High performance SDD
  • Peltier electronic cooling
  • Large active detection area
  • Optimum balance of spectral resolution and high
    count rate

Sample Chamber

  • Large 38 cm diameter x 10 cm deep sample chamber for bulk
  • 15-position automatic sample changer (32mm sample cups)
  • 10-position automatic sample changer (35-40mm sample cups
    and pellets)
  • 9-position automatic sample changer with sample spinner
  • Analysis in air, helium purge, or vacuum

Environmental Conditions

  • Ambient temperature 18-28ºC (65-82ºF)
  • Relative humidity ≤75%
  • Vibration: undetectable by people
  • Free from corrosive gas, dust and particles
  • External PC computer system
  • Microsoft® Windows Vista® operating system
  • Keyboard and mouse
  • Monitor
  • Printer

Software & Application Packages

  • Menu-based software for control of spectrometer functions and data analysis
  • Application templates
  • Simple flow bar wizard to create your own methods
  • RPF-SQX FP for qualitative and quantitative analysis
  • Matching Library for augmentation of FP
  • Automatic spectral overlap deconvolution
  • Empirical calibration with overlap and matrix compensation

Spectrometer Data

  • Single phase AC 100/220V, 15/7A (50/60 Hz)
  • Dimensions: 60(W) X 60(D) X 40(H) cm (23.6 X 23.6 X 15.7 inch)
  • Weight: 80 kg (176 lbs)


  • Fifth secondary target for optimum excitation of Na and Mg
  • 9-position automatic sample changer with sample spinner
  • Vacuum system
  • Uninterruptible power supply (UPS)
  • 10-position automatic sample changer

NEX CG accessories

Aqueous Liquid Sample Carrier for PPB-level Trace Element Analysis
With the patented Rigaku UltraCarry, you can use your Rigaku NEX CG spectrometer to quantify trace elements in aqueous liquids down to parts-per-billion (ppb) concentration levels. Routine elemental analysis of contaminated water or industrial wastewater can now be performed without an Atomic Absorption (AA) or Inductively Coupled Plasma (ICP) spectrometer. UltraCarry based trace element analysis is suitable for use by non-technical personnel.
  • Analyze a wide range of elements (11Na to 92U)
  • PPB-level elemental detection limits for aqueous samples
  • Simple three-step process: pipette, dry and measure
  • Easy-to-use EZ Analysis NEX CG user interface

EDXRF trace element analysis only from Rigaku
UltraCarry is a novel disposable (single-use) sample retainer for X-ray fluorescence (XRF) analysis that is used to preconcentrate a liquid sample into an uniform sample carrier that is optimized for the suppression of background noise. This approach dramatically improves the signal-to-noise ratio, resulting in almost three orders of magnitude improvement in the Lower Limit of Detection (LLD or LOD) and Limit of Quantification (LOQ) for heavy elements.
The UltraCarry sample retainer comprises a ring-shaped support fitted with a X-ray transmissive hydrophobic film and central liquid absorbent element pad. For routine analysis using UltraCarry, a recommended vacuum dryer apparatus — Rigaku UltraDry — is available as an XRF accessory.

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