Determination of Effective Atomic Number of Multifunctional Materials by Beta Backscatter (CAT#: STEM-ST-0172-YJL)

Name: Determination of Effective Atomic Number of Multifunctional Materials by Beta Backscatter
SKU: STEM-ST-0172-YJL
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Introduction

The effective atomic number (Zeff) of multifunctional materials has been studied extensively both theoretically as well as experimentally by several investigators. It is well known that the atomic number for composite material cannot be expressed in a single number; the effective atomic number is the ratio of the total atomic crosssection to the total electronic cross-section involved during radiation interaction. In other words, it is the fraction of total number of electrons of composite material participates in radiation-atom interaction number.

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Principle Applications Procedure Materials

Principle

Beta Backscatter is a non-destructive, direct-contact method of coatings measurement. Beta backscatter instruments can measure coatings that have at least a 20% density difference from the coating and substrate. Thus, beta can be used measure Au/Ni, but not Ni/Cu. Increased density difference between the coating and substrate equates to increased accuracy and faster measurements. The range of thickness that can be measured is determined by the strength of the beta source located in the probe.