How to Use Reference Materials in Reference-Free X-Ray Fluorescence Analysis

—Experience in the Certified Reference Material NMIJ CRM 5208-a—

Abstract

In the latest practical X-ray fluorescence analysis, reference-free determination without the use of calibration curve is frequently employed. Supplying and distributing certified reference materials widely are crucial to maintain high reliability of analysis, in spite of wide variety of instruments, operators and conditions for measurements. Based on some experiences of the round robin test for developing the certified reference material NMIJ CRM 5208-a, the present paper describes some recommendations and remarks for end users.