Description
A thin film for XRF analysis has the function of containing the liquid, powder, suspension sample. The choice depends upon the film characteristics, chemical resistance and mechanical resistance.
How to choose?
The selection of the suitable film is principally based on two factors:
- the transmission efficiency
- the chemical resistance to the sample
Other consideration:
- robustness
- use under vacuum or under pression
- integration time
- excitation power and temperature
1. TRANSMITTANCE OF SPECTRAL LINES
The transmittance properties of a thin-film are functions of gauge thickness, density and
mass attenuation coefficients of the constituent chemical, the image below can help you understanding the relation between transmittance and thickness.
The chart below is commonly used to analyse the % of film and thickness transmittance in relation to spectrum lines in keV or Ångstrom.
2. CHEMICAL RESISTANCE
In conjunction with selecting a thin-film providing a high % Transmittance value, evaluate the resistance of
a thin-film sample support substance to chemical attack by a sample material from the following table.
Liquid sample substances are more prone to degrading a thin-film than solids.
See the table to check resistance.
Chemplex films are available in continuous rolls and in precutted discs. The film production is under controlled condition in order to minimize pollution and element traces.
Chemplex Industries Inc. rappresenta da sempre il nome di riferimento mondiale per la preparazione dei campioni per analisi XRF. Non è un caso infatti che tutti i principali fabbricanti di strumentazione XRF raccomandino i materiali Chemplex: una costante attività di ricerca ed innovazione, l’attenzione continua alle esigenze del mercato ed una qualità impareggiabile dei prodotti rendono Chemplex il partner ideale per assicurare ripetibilità e sicurezza nella preparazione dei campioni per l’analisi XRF.
Chemplex providies films, sample cups and other XRF analysis accessories.
Nordtest has been the official Chemplex distributor for many years, and together they work together to guarantee their customers a high level of technical support based on their extensive experience and expertise in XR technology.