This paper describes the method and way for the stable magnetism of VG354 mass spectrometer. Hall probe is fixed by technological innovation so that the magnetism can be stabilized . Sr and Nd isotopic ratio are mormalized to 86Sr/88Sr=0.1194 and 146Nd/144Nd =0.7219. The 87Sr/86Sr (NBS987)=0.710228±10(n=24).The 146Nd/144Nd (La Jolla) =0.511860±6(n=9).
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