Economical method of on-line data processing for an isotope-ratio mass spectrometer

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Abstract
An adaptation of a TI 59 programmable calculator to a home-made digital system, described earlier by the authors (see ibid., vol.13, p.346, March 1980), is described. Further valuable features of the system have been established: (i) automatic evaluation of delta values together with information about their precision and the sample pressure in the inlet system, (ii) on-line correction of biases and calculation of absolute delta values, (iii) increase in analytical efficiency to over 30 samples daily with a routine precision of 0.05 per mil. Details of the new modifications, the calculator program and instrumental precision are included.