Background: The designing of the X-ray fluorescence (XRF) analyzer’s geometric layouts need to be considered

such as ‘detector to specimen’ distance

‘detector to source’ distance

‘source to specimen’ distance. The desired X-ray collection angle is one of the important factors of the detection performance. However

the experience geometric layouts have been unable to meet every XRF analyzer designing

because the performance of the excitation source or the detector is getting better

sample processing technology is much more advanced

and so on. Purpose: The aim is to study the impact of the desired X-ray collection angle on XRF analyzer designing

and provide a technical guidance on methodologies for XRF analyzer designing. Methods: In this paper

we build the XRF analyzer models by the Monte Carlo method and analyze the impacts of the desired X-ray collection angle on XRF analyzer designing. Results: Kinds of factors with the desired X-ray collection angle are analyzed

such as Cu’s X-ray characteristic fluorescence peak counts

the ‘detector axis to specimen’ distance

the Cu’s ‘peak to source’ ratio. Conclusions: With the increasing of distance between the detector and the specimen

the detector’s pulse counts satisfy an exponential decay law. With the desired X-ray collection angle increasing

the Cu’s X-ray characteristic fluorescence peak counts increase linearly. With the desired X-ray collection angle increasing

the ‘peak to source’ ratio decays exponentially

but the ‘peak to total’ ratio remains the same. Abstract