The report describes the advances in instrumentation and the research activities of the NBS Analytical Mass Spectrometry Selection.Advances in instrumentation include the construction of a multi-stage mass spectrometer, a high vacuum beam valve, a Z focussing lens, a re-designed collector, a filament degas chamber, and new equipment for sample drying.The new facilities at Gaithersburg are described.Elements studied during this period include: B, Cr, Pb, Rb, U, and Pu. Chemical procedures are given for B, Cr, Pb, and Pu; mass spectrometric procedures are given for B, Cr, Pb, Pu, Rb, and U.(Author).

The report describes the advances in instrumentation and the research activities of the Analytical Mass Spectrometry Section during the period July 1967 to June 1968.Advances in instrumentation include the construction of the electronic interface automating both the control of the multistage instrument, and the digital readout and data reduction.A new and improved beam valve is also described.Elements studied during this period include: B, Ni, Pb, Li, U, and Pu.Chemical procedures are given for B, Pb, CaF2, U, and Pu; mass spectrometric procedures are given for B.(Author).