The atomic weight of gadolinium, dysprosium and erbium

Isotopic ratio measurement was made for gadolinium, utilizing the bias correction facor df cerium and europium for the same mass spectrometer. The atomic weight found from the raw data is A(r)(Gd)=157.2473(2). However, the application of the method of doable substitute calibration results in A(r)(Gd) = 157.2526(10), both on 2 sigma basis. For dysprosium and erbium the same method yields A(r)(Dy)=162.4993(10) and A(r)(Er)=167.2611(12).Chemistry, MultidisciplinarySCI(E)0ARTICLE10969-972