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Dual-parameter gamma-ray spectrometer systems with large-volume NaI(Tl) crystals and ultra-low background's have been used for the non-destructive determination of K, Th. U. and cosmic-ray produced radionuclides in 60 lunar samples. The total weight of samples measured with these systems is Q8 kg, , and the individual sample weights varied from 2 to 2300 g. Samples from Apollo 11, 12 9 14 9 15, and 16 missions have been measured. Operation of the spectrometers in a coincidence mode and analyzing singlesand coincidence-spectra permits the simultaneous determination of 8-10 radionuclides in each lunar sample.

NONDESTRUCTIVE DETERMINATION OF RADIONUCLIDES IN LUNAR SAMPLES USING A LARGE LOW-BACKGROUND GAMMA-RAY SPECTROMETER AND A NOVEL APPLICATION OF LEAST-SQUARES FITTING.