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This is the fifth summary of progress of the Radiochemical Analysis Section of the Analytical Chemistry Division at the National Bureau of Standards. The sections' effort comprises four major areas: Mossbauer spectrometry, nuclear chemistry, nuclear instrumentation and the application of statistics in nuclear and analytical chemistry. Studies in nuclear reactions have centered around measurement by time of flight mass spectrometry of helium-4. Statistical methods have been applied to the measurement of peaks in radiation spectra, to reporting trace amounts of radioactivity, to the calibration of Standard Reference materials, and to the reporting of detection limits of a system of measurement. A procedure for cooling a moving absorber with a stationary source for Mossbauer spectrometry is described. Theoretical interpretations of Mossbauer spectra of nickel compounds are given. Several applications of Mossbauer spectrometry, such as surface corrosion studies are described. Preliminary data are given on the charge states of 119mSn after nuclear recoil. An overflow counter for collecting more counts than the memory capacity of a pulse height analyzer is described.