1.Why Discuss the True FP Algorithm?

In the world of precious metal testing, things appear similar but differ in composition.

A shiny ring may be pure gold or gold-plated.

Two gold bars may differ by a few percent in gold content but such small differences can lead to a huge gap in value.

Many clients believe that an XRF analyzer can easily measure the composition.

However, being able to detect does not mean being able to measure accurately, let alone see through what’s beneath the surface.

2.Two Worlds of XRF Analysis

About 90% of precious metal analyzers on the market still rely on the Empirical Algorithm—like a student who only memorizes answers.

It builds a correlation between X-ray peak intensities and element contents through many standard samples.

During testing, this algorithm matches an unknown sample to a standard sample and then calculates the result.

However, real-world samples are far more complex than standard samples, involving differences in manufacturing process, coating thickness, surface treatment, and base material.

If the sample cannot match the standard sample, the results become unreliable.

In contrast, the “True FP (Fundamental Parameters) Algorithm” is like a scientist who understands the underlying physics rather than memorizing answers.

At its core lie the physical laws such as excitation, absorption, and scattering of X-rays.

It can build a mathematical model to simulate a theoretical spectrum.

The model is then iteratively adjusted until the theoretical spectrum aligns with the actual spectrum.

3.Why It Matters for Precious Metal Testing

The challenge in precious metal testing lies in distinguishing subtle differences.

The true FP Algorithm enables XRF spectrometers to:

distinguish gold-plated items from K-gold

identify whether a sample is single-layer or multi-layer

calculate coating thickness and base metal composition

automatically correct for deviations caused by measurement angle or sample shape

4.Why PURERAY insists on the True FP Algorithm

In this industry, many claim to use the FP Algorithm, yet most of them actually rely on semi-empirical algorithm with minor physicalcorrections. It may seem advanced, but in fact, it is not truly physics-based.

PURERAY Instrument is committed to developing the true FP Algorithm, reflecting our pursuit of scientific rigor, accuracy, and customer trust.

With years of R&D, extensive experimental data, and rigorous model validation, PURERAY has developed an FP system capable of delivering precise analysis even for complex samples.

5.From Measurement to Understanding

The True FP Algorithm is not a marketing slogan but a method for XRF spectrometers to interpret the physical world.

It marks a transition in XRF analysis—from the era of experience to the era of science.

It turns data into truth, making precious metal testing more accurate and reliable.

The True FP Algorithm sees through everything—not only materials, but also the science and truth beneath.