NAA for the Detection of Errors

Original intercomparison (Dybczynski et al. ig8oj Element Overall mean SD 

It can be concluded that, in the field of RM certification, NAA represents a major analytical technique contributing significantly to the certification of element contents in environmental and biological RMs, as was also pointed out earlier (Dyb-czynski 1980 1995), and also provides the bulk of the hterature data on NIST SRMs (Gladney et al. 1987,1993). NAA also has a similar position in the field of geological RMs (Roelandts 1991). It possesses unique quality assurance and self-verification aspects (Becker 1993 Byrne 1993 Byrne and Kucera 1997), though these in-built features are rarely exploited in fuU at present. It should be reahzed that the advanta- 

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